Structural Classification of Proteins
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Class: Alpha and beta proteins (a/b)

Mainly parallel beta sheets (beta-alpha-beta units)

Lineage:

  1. Root: scop
  2. Class: Alpha and beta proteins (a/b) [51349]
    Mainly parallel beta sheets (beta-alpha-beta units)

Folds:

  1. TIM beta/alpha-barrel [51350] (33)
    contains parallel beta-sheet barrel, closed; n=8, S=8; strand order 12345678
    the first seven superfamilies have similar phosphate-binding sites
    1. Triosephosphate isomerase (TIM) [51351] (1) picpic
      link to SUPERFAMILY database - Superfamily
    2. Ribulose-phoshate binding barrel [51366] (6) picpic
      link to SUPERFAMILY database - Superfamily
    3. Thiamin phosphate synthase [51391] (1) picpic
      link to SUPERFAMILY database - Superfamily
    4. Pyridoxine 5'-phosphate synthase [63892] (1) picpic
      link to SUPERFAMILY database - Superfamily
    5. FMN-linked oxidoreductases [51395] (1) picpic
      link to SUPERFAMILY database - Superfamily
    6. Inosine monophosphate dehydrogenase (IMPDH) [51412] (1) picpic
      The phosphate moiety of substrate binds in the 'common' phosphate-binding site
      link to SUPERFAMILY database - Superfamily
    7. PLP-binding barrel [51419] (2) picpic
      circular permutation of the canonical fold: begins with an alpha helix and ends with a beta-strand
      link to SUPERFAMILY database - Superfamily
    8. NAD(P)-linked oxidoreductase [51430] (1) picpic
      link to SUPERFAMILY database - Superfamily
    9. (Trans)glycosidases [51445] (14) picpic
      link to SUPERFAMILY database - Superfamily
    10. Metallo-dependent hydrolases [51556] (18) picpic
      the beta-sheet barrel is similarly distorted and capped by a C-terminal helix
      has transition metal ions bound inside the barrel
      link to SUPERFAMILY database - Superfamily
    11. Aldolase [51569] (8) picpic
      Common fold covers whole protein structure
      link to SUPERFAMILY database - Superfamily
    12. Enolase C-terminal domain-like [51604] (2) picpic
      binds metal ion (magnesium or manganese) in conserved site inside barrel
      N-terminal alpha+beta domain is common to this superfamily
      link to SUPERFAMILY database - Superfamily
    13. Phosphoenolpyruvate/pyruvate domain [51621] (7) picpic
      link to SUPERFAMILY database - Superfamily
    14. Malate synthase G [51645] (1) picpic
      link to SUPERFAMILY database - Superfamily
    15. RuBisCo, C-terminal domain [51649] (1) picpic
      link to SUPERFAMILY database - Superfamily
    16. Xylose isomerase-like [51658] (7) picpic
      different families share similar but non-identical metal-binding sites
      link to SUPERFAMILY database - Superfamily
    17. Bacterial luciferase-like [51679] (4) picpic
      consists of clearly related families of somewhat different folds
      link to SUPERFAMILY database - Superfamily
    18. Nicotinate/Quinolinate PRTase C-terminal domain-like [51690] (2) picpic
      incomplete beta/alpha barrel with parallel beta-sheet of 7 strands
      link to SUPERFAMILY database - Superfamily
    19. PLC-like phosphodiesterases [51695] (3) picpic
      link to SUPERFAMILY database - Superfamily
    20. Cobalamin (vitamin B12)-dependent enzymes [51703] (4) picpic
      link to SUPERFAMILY database - Superfamily
    21. tRNA-guanine transglycosylase [51713] (1) picpic
      link to SUPERFAMILY database - Superfamily
    22. Dihydropteroate synthetase-like [51717] (2) picpic
      link to SUPERFAMILY database - Superfamily
    23. UROD/MetE-like [51726] (2) picpic
      link to SUPERFAMILY database - Superfamily
    24. FAD-linked oxidoreductase [51730] (2) picpic
      distinct cofactor-binding mode from both FMN- and NAD(P)-linked TIM-barrel oxidoreductases; families are related by a circular permutation
      link to SUPERFAMILY database - Superfamily
    25. Monomethylamine methyltransferase MtmB [75098] (1) picpic
      link to SUPERFAMILY database - Superfamily
    26. Homocysteine S-methyltransferase [82282] (1) picpic
      link to SUPERFAMILY database - Superfamily
    27. (2r)-phospho-3-sulfolactate synthase ComA [102110] (1) picpic
      link to SUPERFAMILY database - Superfamily
    28. Radical SAM enzymes [102114] (3) picpic
      common Fe-S cluster and SAM binding sites are embedded into complete or incomplete beta/alpha-barrel
      link to SUPERFAMILY database - Superfamily
    29. GlpP-like [110391] (1) picpic
      link to SUPERFAMILY database - Superfamily
    30. CutC-like [110395] (1) picpic
      link to SUPERFAMILY database - Superfamily
    31. ThiG-like [110399] (1) picpic
      shares the common phosphate-binding site with other superfamilies
      link to SUPERFAMILY database - Superfamily
    32. TM1631-like [117396] (1) picpic
      link to SUPERFAMILY database - Superfamily
    33. EAL domain-like [141868] (1) picpic
      variant of the beta/alpha-barrel fold with strand 1 being antiparallel to the rest
      link to SUPERFAMILY database - Superfamily
  2. NAD(P)-binding Rossmann-fold domains [51734] (1)
    core: 3 layers, a/b/a; parallel beta-sheet of 6 strands, order 321456
    The nucleotide-binding modes of this and the next two folds/superfamilies are similar
    1. NAD(P)-binding Rossmann-fold domains [51735] (12) picpic
      link to SUPERFAMILY database - Superfamily
  3. FAD/NAD(P)-binding domain [51904] (1)
    core: 3 layers, b/b/a; central parallel beta-sheet of 5 strands, order 32145; top antiparallel beta-sheet of 3 strands, meander
    1. FAD/NAD(P)-binding domain [51905] (8) picpic
      link to SUPERFAMILY database - Superfamily
  4. Nucleotide-binding domain [51970] (1)
    3 layers: a/b/a; parallel beta-sheet of 5 strands, order 32145; Rossmann-like
    1. Nucleotide-binding domain [51971] (3) picpic
      this superfamily shares the common nucleotide-binding site with and provides a link between the Rossmann-fold NAD(P)-binding and FAD/NAD(P)-binding domains
      link to SUPERFAMILY database - Superfamily
  5. MurCD N-terminal domain [51983] (1)
    3 layers: a/b/a; parallel beta-sheet of 5 strands, order 32145; incomplete Rossmann-like fold; binds UDP group
    1. MurCD N-terminal domain [51984] (1) picpic
      link to SUPERFAMILY database - Superfamily
  6. 7-stranded beta/alpha barrel [51988] (3)
    variant of beta/alpha barrel; parallel beta-sheet barrel, closed, n=7, S=8; strand order 1234567; some members may have fewer strands
    1. Glycosyl hydrolases family 6, cellulases [51989] (1) picpic
      link to SUPERFAMILY database - Superfamily
    2. PHP domain-like [89550] (2) picpic
      link to SUPERFAMILY database - Superfamily
    3. Glycoside hydrolase/deacetylase [88713] (8) picpic
      in the different families beta-barrels are similarly distorted but may vary in the number of strands
      link to SUPERFAMILY database - Superfamily
  7. PFL-like glycyl radical enzymes [51997] (1)
    contains: barrel, closed; n=10, S=10; accommodates a hairpin loop inside the barrel
    1. PFL-like glycyl radical enzymes [51998] (5) picpic
      duplication: the N- and C-terminal halves have similar topologies
      link to SUPERFAMILY database - Superfamily
  8. The "swivelling" beta/beta/alpha domain [52008] (10)
    3 layers: b/b/a; the central sheet is parallel, and the other one is antiparallel; there are some variations in topology
    this domain is thought to be mobile in most multi-domain proteins known to contain it
    1. Phosphohistidine domain [52009] (2) picpic
      contains barrel, closed, n=7, S=10
      link to SUPERFAMILY database - Superfamily
    2. RraA-like [89562] (1) picpic
      structural similarity and possible distant homology to the phosphohistidine domain of pyruvate phosphate dikinase
      link to SUPERFAMILY database - Superfamily
    3. Putative cyclase [102198] (1) picpic
      contains mixed beta-sheet barrel, closed n=7, S=10
      link to SUPERFAMILY database - Superfamily
    4. LeuD/IlvD-like [52016] (3) picpic
      contains mixed beta-sheet barrel, closed n=7, S=10
      link to SUPERFAMILY database - Superfamily
    5. Carbamoyl phosphate synthetase, small subunit N-terminal domain [52021] (1) picpic
      link to SUPERFAMILY database - Superfamily
    6. Swiveling domain of dehydratase reactivase alpha subunit [82317] (1) picpic
      link to SUPERFAMILY database - Superfamily
    7. PA domain [52025] (1) picpic
      link to SUPERFAMILY database - Superfamily
    8. GroEL apical domain-like [52029] (2) picpic
      link to SUPERFAMILY database - Superfamily
    9. FumA C-terminal domain-like [117457] (1) picpic
      link to SUPERFAMILY database - Superfamily
    10. LD-carboxypeptidase A C-terminal domain-like [141986] (1) picpic
      link to SUPERFAMILY database - Superfamily
  9. Barstar-like [52037] (2)
    2 layers, a/b; parallel beta-sheet of 3 strands, order 123
    1. Barstar-related [52038] (1) picpic
      link to SUPERFAMILY database - Superfamily
    2. Ribosomal protein L32e [52042] (1) picpic
      link to SUPERFAMILY database - Superfamily
  10. MurF and HprK N-domain-like [63417] (2)
    core: 3 layers, a/b/a; parallel beta-sheet of 4 strands, order 1234; structural similarity of the MurF and HprK extends beyond the core.
    1. MurE/MurF N-terminal domain [63418] (1) picpic
      binds UDP group
      link to SUPERFAMILY database - Superfamily
    2. HprK N-terminal domain-like [75138] (2) picpic
      probable phosphatase
      link to SUPERFAMILY database - Superfamily
  11. Leucine-rich repeat, LRR (right-handed beta-alpha superhelix) [52046] (3)
    2 curved layers, a/b; parallel beta-sheet; order 1234...N; there are sequence similarities between different superfamilies
    1. RNI-like [52047] (3) picpic
      regular structure consisting of similar repeats
      link to SUPERFAMILY database - Superfamily
    2. L domain-like [52058] (8) picpic
      less regular structure consisting of variable repeats
      link to SUPERFAMILY database - Superfamily
    3. Outer arm dynein light chain 1 [52075] (1) picpic
      (beta-beta-alpha)n superhelix
      link to SUPERFAMILY database - Superfamily
  12. Ribosomal proteins L15p and L18e [52079] (1)
    core: three turns of irregular (beta-beta-alpha)n superhelix
    1. Ribosomal proteins L15p and L18e [52080] (1) picpic
      link to SUPERFAMILY database - Superfamily
  13. SpoIIaa-like [52086] (2)
    core: 4 turns of a (beta-alpha)n superhelix
    1. CRAL/TRIO domain [52087] (1) picpic
      link to SUPERFAMILY database - Superfamily
    2. SpoIIaa-like [52091] (2) picpic
      link to SUPERFAMILY database - Superfamily
  14. ClpP/crotonase [52095] (1)
    core: 4 turns of (beta-beta-alpha)n superhelix
    1. ClpP/crotonase [52096] (4) picpic
      link to SUPERFAMILY database - Superfamily
  15. BRCT domain [52112] (1)
    3 layers, a/b/a; core: parallel beta-sheet of 4 strands, order 2134
    1. BRCT domain [52113] (5) picpic
      Pfam 00533
      link to SUPERFAMILY database - Superfamily
  16. Lumazine synthase [52120] (1)
    3 layers, a/b/a; core: parallel beta-sheet of 4 strands, order 2134
    1. Lumazine synthase [52121] (1) picpic
      link to SUPERFAMILY database - Superfamily
  17. Uracil-DNA glycosylase-like [52140] (1)
    3 layers, a/b/a; core: parallel beta-sheet of 4 strands, order 2134
    1. Uracil-DNA glycosylase-like [52141] (4) picpic
      link to SUPERFAMILY database - Superfamily
  18. Creatininase [102214] (1)
    3 layers, a/b/a; core: parallel beta-sheet of 4 strands, order 2134
    1. Creatininase [102215] (1) picpic
      link to SUPERFAMILY database - Superfamily
  19. DNA polymerase III psi subunit [102219] (1)
    3 layers, a/b/a; parallel beta-sheet of 4 strands, order 2134
    1. DNA polymerase III psi subunit [102220] (1) picpic
      link to SUPERFAMILY database - Superfamily
  20. Initiation factor IF2/eIF5b, domain 3 [52155] (1)
    3 layers, a/b/a; core: parallel beta-sheet of 4 strands, order 2134
    1. Initiation factor IF2/eIF5b, domain 3 [52156] (1) picpic
      link to SUPERFAMILY database - Superfamily
  21. Aminoacid dehydrogenase-like, N-terminal domain [53222] (1)
    core: 3 layers: a/b/a; parallel beta-sheet of 4 strands; 2134
    1. Aminoacid dehydrogenase-like, N-terminal domain [53223] (5) picpic
      link to SUPERFAMILY database - Superfamily
  22. Toprim domain [110454] (1)
    3 layers, a/b/a; parallel beta-sheet of 4 strands, order 2134
    1. Toprim domain [110455] (1) picpic
      this domain is also present in several multidomain proteins that are not split in scop yet: scop_sf 56712, scop_sf 56719, scop_sf 56726, scop_sf 56731
      link to SUPERFAMILY database - Superfamily
  23. AtpF-like [159467] (1)
    3 layers, a/b/a; core: parallel beta-sheet of 4 strands, order 2134
    1. AtpF-like [159468] (1) picpic
  24. Ribosomal protein L13 [52160] (1)
    3 layers, a/b/a; core: parallel beta-sheet of 4 strands, order 3214
    1. Ribosomal protein L13 [52161] (1) picpic
      link to SUPERFAMILY database - Superfamily
  25. Ribosomal protein L4 [52165] (1)
    3 layers, a/b/a; core: parallel beta-sheet of 4 strands, order 1423
    1. Ribosomal protein L4 [52166] (1) picpic
      link to SUPERFAMILY database - Superfamily
  26. Nqo1 FMN-binding domain-like [142018] (1)
    3 layers, a/b/a; parallel beta-sheet of 4 strands, order 3214
    1. Nqo1 FMN-binding domain-like [142019] (1) picpic
      link to SUPERFAMILY database - Superfamily
  27. Flavodoxin-like [52171] (15)
    3 layers, a/b/a; parallel beta-sheet of 5 strand, order 21345
    1. CheY-like [52172] (7) picpic
      link to SUPERFAMILY database - Superfamily
    2. Toll/Interleukin receptor TIR domain [52200] (1) picpic
      link to SUPERFAMILY database - Superfamily
    3. Hypothetical protein MTH538 [52206] (1) picpic
      link to SUPERFAMILY database - Superfamily
    4. Succinyl-CoA synthetase domains [52210] (1) picpic
      link to SUPERFAMILY database - Superfamily
    5. Flavoproteins [52218] (8) picpic
      link to SUPERFAMILY database - Superfamily
    6. Cobalamin (vitamin B12)-binding domain [52242] (1) picpic
      link to SUPERFAMILY database - Superfamily
    7. N5-CAIR mutase (phosphoribosylaminoimidazole carboxylase, PurE) [52255] (1) picpic
      link to SUPERFAMILY database - Superfamily
    8. SGNH hydrolase [52266] (9) picpic
      link to SUPERFAMILY database - Superfamily
    9. Beta-D-glucan exohydrolase, C-terminal domain [52279] (1) picpic
      link to SUPERFAMILY database - Superfamily
    10. Formate/glycerate dehydrogenase catalytic domain-like [52283] (3) picpic
      link to SUPERFAMILY database - Superfamily
    11. Type II 3-dehydroquinate dehydratase [52304] (1) picpic
      link to SUPERFAMILY database - Superfamily
    12. N-(deoxy)ribosyltransferase-like [52309] (3) picpic
      there are similar active site architectures as well as the catalytic mechanisms of functionally characterised members
      link to SUPERFAMILY database - Superfamily
    13. Ribosomal protein S2 [52313] (1) picpic
      fold elaborated with additional structures
      link to SUPERFAMILY database - Superfamily
    14. Precorrin-8X methylmutase CbiC/CobH [63965] (1) picpic
      fold elaborated with additional structures
      link to SUPERFAMILY database - Superfamily
    15. Class I glutamine amidotransferase-like [52317] (9) picpic
      conserved positions of the oxyanion hole and catalytic nucleophile; different constituent families contain different additional structures
      link to SUPERFAMILY database - Superfamily
  28. Methylglyoxal synthase-like [52334] (1)
    3 layers, a/b/a; parallel beta-sheet of 5 strands, order 32145
    1. Methylglyoxal synthase-like [52335] (3) picpic
      contains a common phosphate-binding site
      link to SUPERFAMILY database - Superfamily
  29. Ferredoxin reductase-like, C-terminal NADP-linked domain [52342] (1)
    3 layers, a/b/a; parallel beta-sheet of 5 strands, order 32145
    1. Ferredoxin reductase-like, C-terminal NADP-linked domain [52343] (5) picpic
      binds NADP differently than classical Rossmann-fold
      N-terminal FAD-linked domain contains (6,10) barrel
      link to SUPERFAMILY database - Superfamily
  30. Adenine nucleotide alpha hydrolase-like [52373] (3)
    core: 3 layers, a/b/a ; parallel beta-sheet of 5 strands, order 32145
    1. Nucleotidylyl transferase [52374] (5) picpic
      link to SUPERFAMILY database - Superfamily
    2. Adenine nucleotide alpha hydrolases-like [52402] (6) picpic
      share similar mode of ligand (Adenosine group) binding
      can be subdivided into two group with closer relationships within each group than between the groups; the first three families form one group whereas the last two families form the other group
      link to SUPERFAMILY database - Superfamily
    3. UDP-glucose/GDP-mannose dehydrogenase C-terminal domain [52413] (1) picpic
      link to SUPERFAMILY database - Superfamily
  31. Nucleoside phosphorylase/phosphoribosyltransferase catalytic domain [52417] (1)
    3 layers: a/b/a; parallel beta-sheet of 5 strands, order 32145; Rossmann-like
    1. Nucleoside phosphorylase/phosphoribosyltransferase catalytic domain [52418] (1) picpic
      link to SUPERFAMILY database - Superfamily
  32. Cryptochrome/photolyase, N-terminal domain [52424] (1)
    3 layers: a/b/a; parallel beta-sheet of 5 strands, order 32145; Rossmann-like
    1. Cryptochrome/photolyase, N-terminal domain [52425] (1) picpic
      link to SUPERFAMILY database - Superfamily
  33. DsrEFH-like [75168] (1)
    3 layers: a/b/a, core: parallel beta-sheet of 5 strands, order 43215
    1. DsrEFH-like [75169] (2) picpic
      link to SUPERFAMILY database - Superfamily
  34. PIN domain-like [88722] (1)
    3 layers, a/b/a; core: parallel beta-sheet of 5 strands, order 32145
    1. PIN domain-like [88723] (2) picpic
      link to SUPERFAMILY database - Superfamily
  35. Ribose/Galactose isomerase RpiB/AlsB [89622] (1)
    3 layers: a/b/a, core: parallel beta-sheet of 5 strands, order 21354; topological similarity to a part of the arginase/deacetylase fold
    1. Ribose/Galactose isomerase RpiB/AlsB [89623] (1) picpic
      link to SUPERFAMILY database - Superfamily
  36. EreA/ChaN-like [159500] (1)
    Core: 3 layers: a/b/a; parallel beta-sheet of 5 strands, order:51423;
    1. EreA/ChaN-like [159501] (3) picpic
      there are four conserved residues in the putative active site: two His and two Glu
  37. alpha/beta knot [75216] (1)
    core: 3 layers: a/b/a, parallel beta-sheet of 5 strands, order 21435; contains a deep trefoil knot
    1. alpha/beta knot [75217] (8) picpic
      known or predicted SAM-dependent methytransferases including the SPOUT 'sequence' superfamily
      all known members have dimeric structures
      link to SUPERFAMILY database - Superfamily
  38. PreATP-grasp domain [52439] (1)
    3 layers: a/b/a; parallel or mixed beta-sheet of 4 to 6 strands
    possible rudiment form of Rossmann-fold domain
    1. PreATP-grasp domain [52440] (8) picpic
      precedes the ATP-grasp domain common to all superfamily members, can contain a substrate-binding function
      link to SUPERFAMILY database - Superfamily
  39. DHS-like NAD/FAD-binding domain [52466] (1)
    3 layers: a/b/a; parallel beta-sheet of 6 strands, order 321456; Rossmann-like
    1. DHS-like NAD/FAD-binding domain [52467] (6) picpic
      binds cofactor molecules in the opposite direction than classical Rossmann fold
      link to SUPERFAMILY database - Superfamily
  40. Tubulin nucleotide-binding domain-like [52489] (1)
    3 layers: a/b/a; parallel beta-sheet of 6 strands, order 321456
    1. Tubulin nucleotide-binding domain-like [52490] (1) picpic
      link to SUPERFAMILY database - Superfamily
  41. Isochorismatase-like hydrolases [52498] (1)
    3 layers: a/b/a; parallel beta-sheet of 6 strands, order 321456
    1. Isochorismatase-like hydrolases [52499] (1) picpic
      link to SUPERFAMILY database - Superfamily
  42. Dipeptide transport protein [63991] (1)
    3 layers: a/b/a; parallel beta-sheet of 6 strands, order 321456; also contains a C-terminal alpha+beta subdomain
    1. Dipeptide transport protein [63992] (1) picpic
      link to SUPERFAMILY database - Superfamily
  43. Homo-oligomeric flavin-containing Cys decarboxylases, HFCD [52506] (1)
    3 layers: a/b/a; parallel beta-sheet of 6 strands, order 321456
    1. Homo-oligomeric flavin-containing Cys decarboxylases, HFCD [52507] (1) picpic
      link to SUPERFAMILY database - Superfamily
  44. HAD-like [56783] (1)
    3 layers: a/b/a; parallel beta-sheet of 6 strands, order 321456
    1. HAD-like [56784] (25) picpic
      usually contains an insertion (sub)domain after strand 1
      link to SUPERFAMILY database - Superfamily
  45. NagB/RpiA/CoA transferase-like [100949] (1)
    core: 3 layers: a/b/a; parallel or mixed beta-sheet of 6 strands, order 321456
    1. NagB/RpiA/CoA transferase-like [100950] (8) picpic
      link to SUPERFAMILY database - Superfamily
  46. Hypothetical protein MTH777 (MT0777) [75180] (1)
    3 layers: a/b/a; parallel beta-sheet of 6 strands, order 321456
    1. Hypothetical protein MTH777 (MT0777) [75181] (1) picpic
      link to SUPERFAMILY database - Superfamily
  47. Thiamin pyrophosphokinase, catalytic domain [63998] (1)
    3 layers: a/b/a; parallel beta-sheet of 6 strands, order 432156
    1. Thiamin pyrophosphokinase, catalytic domain [63999] (1) picpic
      link to SUPERFAMILY database - Superfamily
  48. Undecaprenyl diphosphate synthase [64004] (1)
    3 layers: a/b/a; parallel beta-sheet of 6 strands, order 342156
    1. Undecaprenyl diphosphate synthase [64005] (1) picpic
      the sheet topology is similar to those of the N-terminal domain of phosphoglycerate kinase and carbamate kinase
      link to SUPERFAMILY database - Superfamily
  49. F420-dependent methylenetetrahydromethanopterin dehydrogenase (MTD) [102323] (1)
    3 layers: a/b/a; parallel beta-sheet of 6 strands, order 213456
    1. F420-dependent methylenetetrahydromethanopterin dehydrogenase (MTD) [102324] (1) picpic
      the sheet topology is similar to those of the Periplasmic binding protein-like I domains
      link to SUPERFAMILY database - Superfamily
  50. Thiamin diphosphate-binding fold (THDP-binding) [52517] (1)
    3 layers: a/b/a; parallel beta-sheet of 6 strands, order 213465
    1. Thiamin diphosphate-binding fold (THDP-binding) [52518] (8) picpic
      there are two different functional modules of this fold: pyridine-binding (Pyr) and pyrophosphate-binding (PP) modules
      two Pyr and two PP modules assemble together in a conserved heterotetrameric core that binds two THDP coenzyme molecules
      link to SUPERFAMILY database - Superfamily
  51. P-loop containing nucleoside triphosphate hydrolases [52539] (1)
    3 layers: a/b/a, parallel or mixed beta-sheets of variable sizes
    1. P-loop containing nucleoside triphosphate hydrolases [52540] (24) picpic
      division into families based on beta-sheet topologies
      link to SUPERFAMILY database - Superfamily
  52. PTS IIb component [52727] (1)
    3 layers: a/b/a, parallel beta-sheet of 6 strands, order 324156
    1. PTS IIb component [52728] (1) picpic
      link to SUPERFAMILY database - Superfamily
  53. DNA polymerase III chi subunit [102399] (1)
    3 layers, a/b/a; parallel beta-sheet of 7 strands, order 7165243
    1. DNA polymerase III chi subunit [102400] (1) picpic
      structural similarity and possible evolutionary relationship to the AAA domain; lacks the P-loop motif
      link to SUPERFAMILY database - Superfamily
  54. Nicotinate mononucleotide:5,6-dimethylbenzimidazole phosphoribosyltransferase (CobT) [52732] (1)
    3 layers: a/b/a, parallel beta-sheet of 7 strands, order 3214567
    1. Nicotinate mononucleotide:5,6-dimethylbenzimidazole phosphoribosyltransferase (CobT) [52733] (1) picpic
      link to SUPERFAMILY database - Superfamily
  55. CofD-like [142337] (1)
    3 layers: a/b/a, parallel beta-sheet of 7 strands, order 3214567; topological similarity to the CobT-like fold (scop_cf 52732)
    1. CofD-like [142338] (1) picpic
      link to SUPERFAMILY database - Superfamily
  56. MCP/YpsA-like [102404] (1)
    3 layers: a/b/a, parallel beta-sheet of 7 strands, order 4321567
    1. MCP/YpsA-like [102405] (2) picpic
      link to SUPERFAMILY database - Superfamily
  57. Methylesterase CheB, C-terminal domain [52737] (1)
    3 layers: a/b/a, parallel beta-sheet of 7 strands, order 3421567
    1. Methylesterase CheB, C-terminal domain [52738] (1) picpic
      link to SUPERFAMILY database - Superfamily
  58. Subtilisin-like [52742] (1)
    3 layers: a/b/a, parallel beta-sheet of 7 strands, order 2314567; left-handed crossover connection between strands 2 & 3
    1. Subtilisin-like [52743] (2) picpic
      link to SUPERFAMILY database - Superfamily
  59. Indigoidine synthase A-like [110580] (1)
    core: 3 layers, a/b/a; parallel beta-sheet of 7 strands, order 2134756
    1. Indigoidine synthase A-like [110581] (1) picpic
      link to SUPERFAMILY database - Superfamily
  60. Arginase/deacetylase [52767] (1)
    3 layers: a/b/a, parallel beta-sheet of 8 strands, order 21387456
    1. Arginase/deacetylase [52768] (2) picpic
      link to SUPERFAMILY database - Superfamily
  61. Alpha-2,3/8-sialyltransferase CstII [102413] (1)
    3 layers: a/b/a; parallel beta-sheet of 8 strands, order 54321678
    1. Alpha-2,3/8-sialyltransferase CstII [102414] (1) picpic
      link to SUPERFAMILY database - Superfamily
  62. Cell-division inhibitor MinC, N-terminal domain [64042] (1)
    beta(2)-(alpha-beta)2-beta; 2 layers, a/b; mixed beta-sheet of 5 strands, order 12345; strands 1 & 5 are antiparallel to the rest
    1. Cell-division inhibitor MinC, N-terminal domain [64043] (1) picpic
      link to SUPERFAMILY database - Superfamily
  63. DTD-like [69499] (1)
    beta(2)-(alpha-beta)2-beta(3); 3 layers, a/b/b; some topological similarity to the N-terminal domain of MinC
    1. DTD-like [69500] (1) picpic
      active form is a dimer
      link to SUPERFAMILY database - Superfamily
  64. CoA-dependent acyltransferases [52776] (1)
    core: 2 layers, a/b; mixed beta-sheet of 6 strands, order 324561; strands 3 & 6 are antiparallel to the rest
    1. CoA-dependent acyltransferases [52777] (3) picpic
      link to SUPERFAMILY database - Superfamily
  65. Phosphotyrosine protein phosphatases I-like [52787] (2)
    3 layers: a/b/a; parallel beta-sheet of 4 strands, order 2134
    1. Phosphotyrosine protein phosphatases I [52788] (1) picpic
      share the common active site structure with the family II
      link to SUPERFAMILY database - Superfamily
    2. PTS system IIB component-like [52794] (2) picpic
      link to SUPERFAMILY database - Superfamily
  66. (Phosphotyrosine protein) phosphatases II [52798] (1)
    core: 3 layers, a/b/a; parallel beta-sheet of 4 strands, order 1423
    1. (Phosphotyrosine protein) phosphatases II [52799] (5) picpic
      share with the family I the common active site structure with a circularly permuted topology
      link to SUPERFAMILY database - Superfamily
  67. Rhodanese/Cell cycle control phosphatase [52820] (1)
    3 layers: a/b/a; parallel beta-sheet of 5 strands, order 32451
    1. Rhodanese/Cell cycle control phosphatase [52821] (4) picpic
      Pfam 00581
      the active site structure is similar to those of the families I and II protein phosphatases; the topology can be related by a different circular permutation to the family I topology
      link to SUPERFAMILY database - Superfamily
  68. Thioredoxin fold [52832] (2)
    core: 3 layers, a/b/a; mixed beta-sheet of 4 strands, order 4312; strand 3 is antiparallel to the rest
    1. Thioredoxin-like [52833] (23) picpic
      link to SUPERFAMILY database - Superfamily
    2. RNA 3'-terminal phosphate cyclase, RPTC, insert domain [52913] (1) picpic
      link to SUPERFAMILY database - Superfamily
  69. Peptidyl-tRNA hydrolase II [102461] (1)
    3 layers: a/b/a; mixed beta-sheet of 4 strands, order 2143, strand 4 is antiparallel to the rest
    1. Peptidyl-tRNA hydrolase II [102462] (1) picpic
      link to SUPERFAMILY database - Superfamily
  70. TK C-terminal domain-like [52921] (1)
    3 layers: a/b/a; mixed beta-sheet of 5 strands, order 13245, strand 1 is antiparallel to the rest
    1. TK C-terminal domain-like [52922] (3) picpic
      link to SUPERFAMILY database - Superfamily
  71. Pyruvate kinase C-terminal domain-like [52934] (2)
    3 layers: a/b/a; mixed beta-sheet of 5 strands, order 32145, strand 5 is antiparallel to the rest
    1. PK C-terminal domain-like [52935] (2) picpic
      link to SUPERFAMILY database - Superfamily
    2. ATP synthase (F1-ATPase), gamma subunit [52943] (1) picpic
      contains an antiparallel coiled coil formed by N- and C-terminal extensions to the common fold
      link to SUPERFAMILY database - Superfamily
  72. Anticodon-binding domain-like [52953] (6)
    3 layers: a/b/a; mixed beta-sheet of five strands, order 21345; strand 4 is antiparallel to the rest
    1. Class II aaRS ABD-related [52954] (2) picpic
      link to SUPERFAMILY database - Superfamily
    2. TolB, N-terminal domain [52964] (1) picpic
      link to SUPERFAMILY database - Superfamily
    3. B12-dependent dehydatase associated subunit [52968] (2) picpic
      link to SUPERFAMILY database - Superfamily
    4. ITPase-like [52972] (3) picpic
      formerly Maf/Ham1; elaborated with additional structures inserted in the common fold
      link to SUPERFAMILY database - Superfamily
    5. CinA-like [142433] (1) picpic
      link to SUPERFAMILY database - Superfamily
    6. XCC0632-like [159594] (2) picpic
      short crossover loop between strands 2 and 3; the antiparallel part of the beta-sheet (strands 3, 4 and 5) and the C-terminal helix are quite long
  73. MTH938-like [64075] (1)
    core: 3 layers, b+a/b/a ; the central mixed sheet of 5 strands: order 21534; strand 2 is antiparallel to the rest
    1. MTH938-like [64076] (1) picpic
      link to SUPERFAMILY database - Superfamily
  74. Restriction endonuclease-like [52979] (4)
    core: 3 layers, a/b/a; mixed beta-sheet of 5 strands, order 12345; strands 2 &, in some families, 5 are antiparallel to the rest
    1. Restriction endonuclease-like [52980] (33) picpic
      link to SUPERFAMILY database - Superfamily
    2. tRNA-intron endonuclease catalytic domain-like [53032] (1) picpic
      link to SUPERFAMILY database - Superfamily
    3. Eukaryotic RPB5 N-terminal domain [53036] (1) picpic
      link to SUPERFAMILY database - Superfamily
    4. TBP-interacting protein-like [159612] (1) picpic
      contains extra C-terminal alpha+beta domain of complex fold with an embeded C2H2 zinc-finger
  75. Resolvase-like [53040] (2)
    Core: 3 layers: a/b/a; mixed beta-sheet of 5 strands, order 21345; strand 5 is antiparallel to the rest
    1. Resolvase-like [53041] (1) picpic
      link to SUPERFAMILY database - Superfamily
    2. beta-carbonic anhydrase, cab [53056] (1) picpic
      link to SUPERFAMILY database - Superfamily
  76. PTS system fructose IIA component-like [53061] (1)
    3 layers: a/b/a; mixed beta-sheet of 5 strands, order 21345; strand 5 is antiparallel to the rest
    1. PTS system fructose IIA component-like [53062] (2) picpic
      active dimer is formed by strand 5 swapping
      link to SUPERFAMILY database - Superfamily
  77. Ribonuclease H-like motif [53066] (7)
    3 layers: a/b/a; mixed beta-sheet of 5 strands, order 32145; strand 2 is antiparallel to the rest
    1. Actin-like ATPase domain [53067] (14) picpic
      duplication contains two domains of this fold
      link to SUPERFAMILY database - Superfamily
    2. Creatinase/prolidase N-terminal domain [53092] (1) picpic
      link to SUPERFAMILY database - Superfamily
    3. Ribonuclease H-like [53098] (14) picpic
      consists of one domain of this fold
      link to SUPERFAMILY database - Superfamily
    4. Translational machinery components [53137] (2) picpic
      link to SUPERFAMILY database - Superfamily
    5. Nitrogenase accessory factor-like [53146] (2) picpic
      link to SUPERFAMILY database - Superfamily
    6. DNA repair protein MutS, domain II [53150] (1) picpic
      link to SUPERFAMILY database - Superfamily
    7. Methylated DNA-protein cysteine methyltransferase domain [53155] (1) picpic
      link to SUPERFAMILY database - Superfamily
  78. Phosphorylase/hydrolase-like [53162] (8)
    core: 3 layers, a/b/a ; mixed sheet of 5 strands: order 21354; strand 4 is antiparallel to the rest; contains crossover loops
    1. HybD-like [53163] (2) picpic
      the HybD fold coincides with the consensus core structure
      link to SUPERFAMILY database - Superfamily
    2. Purine and uridine phosphorylases [53167] (1) picpic
      complex architecture; contains mixed beta-sheet of 8 strands, order 23415867, strands 3, 6 & 7 are antiparallel to the rest; and barrel, closed; n=5, S=8
      link to SUPERFAMILY database - Superfamily
    3. Peptidyl-tRNA hydrolase-like [53178] (1) picpic
      link to SUPERFAMILY database - Superfamily
    4. Pyrrolidone carboxyl peptidase (pyroglutamate aminopeptidase) [53182] (1) picpic
      link to SUPERFAMILY database - Superfamily
    5. Zn-dependent exopeptidases [53187] (9) picpic
      core: mixed beta-sheet of 8 strands, order 12435867; strands 2, 6 & 7 are antiparallel to the rest
      link to SUPERFAMILY database - Superfamily
    6. LigB-like [53213] (1) picpic
      circular permutation of the common fold, most similar to the PNP fold
      link to SUPERFAMILY database - Superfamily
    7. AF0625-like [142535] (1) picpic
      contains extra C-terminal alpha/beta domain: 3 layers, a/b/a; parallel beta-sheet of 4 strands, order 2134
      link to SUPERFAMILY database - Superfamily
    8. Cgl1923-like [159659] (1) picpic
  79. Molybdenum cofactor biosynthesis proteins [53217] (1)
    3 layers: a/b/a; mixed beta-sheet of 5 strands; order: 21354, strand 5 is antiparallel to the rest; permutation of the Phosphorylase/hydrolase-like fold
    1. Molybdenum cofactor biosynthesis proteins [53218] (2) picpic
      link to SUPERFAMILY database - Superfamily
  80. CobE/GbiG C-terminal domain-like [159663] (1)
    3 layers: a/b/a; mixed beta-sheet of 5 strands, order 32154; strand 5 is antiparallel to the rest
    1. CobE/GbiG C-terminal domain-like [159664] (1) picpic
      probably involved in deacylation steps in both anaerobic and aerobic pathways of cobalamin biosynthesis
  81. CbiG N-terminal domain-like [159671] (1)
    3 layers: a/b/a; mixed beta-sheet of 6 strands, order 213456, strand 5 is antiparallel to the rest
    1. CbiG N-terminal domain-like [159672] (1) picpic
      probable biological unit is a homodimer; putative active site is formed by residues from both subunits
  82. Bacterial fluorinating enzyme, N-terminal domain [102521] (1)
    3 layers: a/b/a; mixed beta-sheet of 6 strands; order: 213546, strand 5 is antiparallel to the rest; topological similarity to the MogA-like family fold
    1. Bacterial fluorinating enzyme, N-terminal domain [102522] (1) picpic
      link to SUPERFAMILY database - Superfamily
  83. Caspase-like [52128] (1)
    3 layers, a/b/a; core: mixed beta-sheet of 6 strands, order 213456, strand 6 is antiparallel to the rest
    1. Caspase-like [52129] (2) picpic
      mature protein may be composed of two chains folded in a single domain
      link to SUPERFAMILY database - Superfamily
  84. Macro domain-like [52948] (1)
    3 layers: a/b/a; mixed beta-sheet of 6 strands, order 165243, strand 3 is antiparallel to the rest
    1. Macro domain-like [52949] (2) picpic
      link to SUPERFAMILY database - Superfamily
  85. MurD-like peptide ligases, peptide-binding domain [53243] (1)
    3 layers: a/b/a; mixed beta-sheet of 6 strands, order 126345; strand 1 is antiparallel to the rest
    1. MurD-like peptide ligases, peptide-binding domain [53244] (2) picpic
      link to SUPERFAMILY database - Superfamily
  86. Phosphoglycerate mutase-like [53253] (1)
    core: 3 layers, a/b/a; mixed beta-sheet of 6 strands, order 324156; strand 5 is antiparallel to the rest
    1. Phosphoglycerate mutase-like [53254] (3) picpic
      link to SUPERFAMILY database - Superfamily
  87. PRTase-like [53270] (1)
    core: 3 layers, a/b/a; mixed beta-sheet of 6 strands, order 321456; strand 3 is antiparallel to the rest
    1. PRTase-like [53271] (2) picpic
      link to SUPERFAMILY database - Superfamily
  88. vWA-like [53299] (1)
    core: 3 layers, a/b/a; mixed beta-sheet of 6 strands, order 321456; strand 3 is antiparallel to the rest
    1. vWA-like [53300] (5) picpic
      link to SUPERFAMILY database - Superfamily
  89. Pyruvate-ferredoxin oxidoreductase, PFOR, domain III [53322] (1)
    3 layers: a/b/a; mixed beta-sheet of 6 strands, order 231456; strand 3 is antiparallel to the rest
    1. Pyruvate-ferredoxin oxidoreductase, PFOR, domain III [53323] (1) picpic
      link to SUPERFAMILY database - Superfamily
  90. RbsD-like [102545] (1)
    3 layers: a/b/a; mixed beta-sheet of 6 strands, order 251634; strand 6 is antiparallel to the rest
    1. RbsD-like [102546] (1) picpic
      link to SUPERFAMILY database - Superfamily
  91. FabD/lysophospholipase-like [52150] (1)
    core: 3 layers, a/b/a; mixed beta-sheet of 6 strands, order 432156; strand 4 is antiparallel to the rest
    1. FabD/lysophospholipase-like [52151] (3) picpic
      link to SUPERFAMILY database - Superfamily
  92. L-sulfolactate dehydrogenase-like [89732] (1)
    core: 3 layers, a/b/a; mixed sheet of 7 strands, order 1237456; strands 1, 6 and 7 are antiparallel to the rest
    1. L-sulfolactate dehydrogenase-like [89733] (1) picpic
      topological similarity to the domain 2 of TM1585
      link to SUPERFAMILY database - Superfamily
  93. Formyltransferase [53327] (1)
    3 layers: a/b/a; mixed beta-sheet of 7 strands, order 3214567; strand 6 is antiparallel to the rest
    1. Formyltransferase [53328] (1) picpic
      link to SUPERFAMILY database - Superfamily
  94. S-adenosyl-L-methionine-dependent methyltransferases [53334] (1)
    core: 3 layers, a/b/a; mixed beta-sheet of 7 strands, order 3214576; strand 7 is antiparallel to the rest
    1. S-adenosyl-L-methionine-dependent methyltransferases [53335] (57) picpic
      link to SUPERFAMILY database - Superfamily
  95. LmbE-like [102587] (1)
    3 layers, a/b/a; mixed beta-sheet of 7 strands, order 3214576; strand 7 is antiparallel to the rest; topological similarity to SAM-dependent methyltransferases
    1. LmbE-like [102588] (1) picpic
      link to SUPERFAMILY database - Superfamily
  96. PLP-dependent transferase-like [53382] (3)
    main domain: 3 layers: a/b/a, mixed beta-sheet of 7 strands, order 3245671; strand 7 is antiparallel to the rest
    1. PLP-dependent transferases [53383] (9) picpic
      link to SUPERFAMILY database - Superfamily
    2. PhnH-like [159709] (1) picpic
      single domain protein of similar topology to the core domain of PLP-transferases
    3. Dhaf3308-like [159713] (1) picpic
      not known to bind PLP cofactor; the extra N-terminal subdomain has a enolase N-terminal domain-like fold (scop_cf 54825)
  97. Nucleotide-diphospho-sugar transferases [53447] (1)
    3 layers: a/b/a; mixed beta-sheet of 7 strands, order 3214657; strand 6 is antiparallel to the rest
    1. Nucleotide-diphospho-sugar transferases [53448] (19) picpic
      link to SUPERFAMILY database - Superfamily
  98. RibA-like [142694] (1)
    3 layers: a/b/a; mixed beta-sheet of 7 strands, order 1235467, strands 1 and 3 are antiparallel to the rest; partial topological similarity to some alpha/beta hydrolases (scop_cf 53473)
    1. RibA-like [142695] (1) picpic
      link to SUPERFAMILY database - Superfamily
  99. Activating enzymes of the ubiquitin-like proteins [69571] (1)
    3 layers: a/b/a; mixed beta-sheet of 8 strands, order 32145678; strands 6 and 8 are antiparallel to the rest
    1. Activating enzymes of the ubiquitin-like proteins [69572] (2) picpic
      transfer adenylyl group to the C-terminal carboxyl group of the ubiquitin and MoaD/ThiS-related proteins
      the ATP nucleotide-binding site is similar to that of the NAD-binding Rossmann-folds
      link to SUPERFAMILY database - Superfamily
  100. alpha/beta-Hydrolases [53473] (1)
    core: 3 layers, a/b/a; mixed beta-sheet of 8 strands, order 12435678, strand 2 is antiparallel to the rest
    1. alpha/beta-Hydrolases [53474] (41) picpic
      many members have left-handed crossover connection between strand 8 and additional strand 9
      link to SUPERFAMILY database - Superfamily
  101. Nucleoside hydrolase [53589] (1)
    core: 3 layers, a/b/a ; mixed beta-sheet of 8 strands, order 32145687; strand 7 is antiparallel to the rest
    1. Nucleoside hydrolase [53590] (1) picpic
      link to SUPERFAMILY database - Superfamily
  102. Dihydrofolate reductase-like [53596] (1)
    3 layers: a/b/a; mixed beta-sheet of 8 strands, order 34251687; strand 8 is antiparallel to the rest
    1. Dihydrofolate reductase-like [53597] (2) picpic
      link to SUPERFAMILY database - Superfamily
  103. Ribokinase-like [53612] (3)
    core: 3 layers: a/b/a; mixed beta-sheet of 8 strands, order 21345678, strand 7 is antiparallel to the rest
    potential superfamily: members of this fold have similar functions but different ATP-binding sites
    1. Ribokinase-like [53613] (5) picpic
      has extra strand located between strands 2 and 3
      link to SUPERFAMILY database - Superfamily
    2. MurD-like peptide ligases, catalytic domain [53623] (2) picpic
      has extra strand located between strands 1 and 2
      link to SUPERFAMILY database - Superfamily
    3. CoaB-like [102645] (1) picpic
      combination of the Rossmann-like and Ribokinase-like topologies; mixed beta-sheet of 8 strands, order 32145678, strand 7 is antiparallel to the rest
      link to SUPERFAMILY database - Superfamily
  104. YjeF N-terminal domain-like [64152] (1)
    3 layers: a/b/a; mixed (mainly parallel) beta-sheet of 8 strands, order 32145678; strand 8 is antiparallel to the rest
    1. YjeF N-terminal domain-like [64153] (1) picpic
      possible circular permutation of the ribokinase-like fold (of the YjeF C-terminal domain)
      link to SUPERFAMILY database - Superfamily
  105. Carbamate kinase-like [53632] (1)
    3 layers: a/b/a; mixed (mainly parallel) beta-sheet of 8 strands, order 34215786; strand 8 is antiparallel to the rest
    1. Carbamate kinase-like [53633] (3) picpic
      the sheet topology is similar to those of undecaprenyl diphosphate synthase and the N-terminal domain of phosphoglycerate kinase
      link to SUPERFAMILY database - Superfamily
  106. 2,3-Bisphosphoglycerate-independent phosphoglycerate mutase, substrate-binding domain [64157] (1)
    core:3 layers: a/b/a; mixed beta-sheet of 8 strands, order 45321678, strands 4 and 5 are antiparallel to the rest
    1. 2,3-Bisphosphoglycerate-independent phosphoglycerate mutase, substrate-binding domain [64158] (1) picpic
      link to SUPERFAMILY database - Superfamily
  107. Alkaline phosphatase-like [53648] (1)
    core:3 layers: a/b/a; mixed beta-sheet of 8 strands, order 43516728, strand 7 is antiparallel to the rest
    1. Alkaline phosphatase-like [53649] (5) picpic
      link to SUPERFAMILY database - Superfamily
  108. TTHA0583/YokD-like [110709] (1)
    3 layers: a/b/a; mixed beta-sheet of 8 strands, order 78612354; strands 3, 4 and 8 are antiparallel to the rest
    1. TTHA0583/YokD-like [110710] (2) picpic
      link to SUPERFAMILY database - Superfamily
  109. Glycerol-3-phosphate (1)-acyltransferase [69592] (1)
    3 layers: a/b/a; mixed beta-sheet of 9 strands, order 918736452; strands 1, 2 and 8 are antiparallel to the rest
    1. Glycerol-3-phosphate (1)-acyltransferase [69593] (1) picpic
      some topological similarity to the dihydrofolate reductase fold
      link to SUPERFAMILY database - Superfamily
  110. AraD/HMP-PK domain-like [53638] (1)
    3 layers: a/b/a; mixed (mostly antiparallel) beta-sheet of 9 strands, order 432159876; left-handed crossover between strands 4 and 5
    1. AraD/HMP-PK domain-like [53639] (2) picpic
      link to SUPERFAMILY database - Superfamily
  111. SurE-like [64166] (1)
    3 layers: a/b/a; mixed beta-sheet of 9 strands, order 342156798; strands 3, 8 and 9 are antiparallel to the rest; left-handed crossover connection between strands 6 and 7
    1. SurE-like [64167] (1) picpic
      some topological similarity to the N-terminal domain of Glutaminase/Asparaginase family
      link to SUPERFAMILY database - Superfamily
  112. YerB-like [159773] (1)
    3 layers: b/b/a; central mixed beta-sheet of 9 strands, order 541329678; strands 3 and 7 are antiparallel to the rest; an unusual "over the other end" connection between strands 3 and 4
    1. YerB-like [159774] (1) picpic
  113. CdCA1 repeat-like [159778] (1)
    contains two parallel beta-strands of four strands each; the sheets contact each other with edges at a right angle
    1. CdCA1 repeat-like [159779] (1) picpic
  114. Isocitrate/Isopropylmalate dehydrogenase-like [53658] (1)
    consists of two intertwined (sub)domains related by pseudo dyad; duplication
    3 layers: a/b/a; single mixed beta-sheet of 10 strands, order 213A945867 (A=10); strands from 5 to 9 are antiparallel to the rest
    1. Isocitrate/Isopropylmalate dehydrogenase-like [53659] (5) picpic
      the constituent families form similar dimers
      link to SUPERFAMILY database - Superfamily
  115. Amidase signature (AS) enzymes [75303] (1)
    possible duplication: the topologies of N- and C-terminal halves are similar; 3 layers: a/b/a; single mixed beta-sheet of 10 strands, order 213549A867 (A=10); strands from 5 to 9 are antiparallel to the rest
    1. Amidase signature (AS) enzymes [75304] (1) picpic
      link to SUPERFAMILY database - Superfamily
  116. ATC-like [53670] (2)
    consists of two similar domains related by pseudo dyad; duplication
    core: 3 layers, a/b/a, parallel beta-sheet of 4 strands, order 2134
    1. Aspartate/ornithine carbamoyltransferase [53671] (1) picpic
      link to SUPERFAMILY database - Superfamily
    2. Aspartate/glutamate racemase [53681] (1) picpic
      link to SUPERFAMILY database - Superfamily
  117. Tryptophan synthase beta subunit-like PLP-dependent enzymes [53685] (1)
    consists of two similar domains related by pseudo dyad; duplication
    core: 3 layers, a/b/a; parallel beta-sheet of 4 strands, order 3214
    1. Tryptophan synthase beta subunit-like PLP-dependent enzymes [53686] (1) picpic
      link to SUPERFAMILY database - Superfamily
  118. SIS domain [53696] (1)
    3 layers: a/b/a; parallel beta-sheet of 5 strands, order 21345
    1. SIS domain [53697] (3) picpic
      link to SUPERFAMILY database - Superfamily
  119. Formate dehydrogenase/DMSO reductase, domains 1-3 [53705] (1)
    contains of two similar intertwined domains related by pseudo dyad; duplication
    core: 3 layers: a/b/a; parallel beta-sheet of 5 strands, order 32451
    1. Formate dehydrogenase/DMSO reductase, domains 1-3 [53706] (1) picpic
      molybdopterine enzyme
      link to SUPERFAMILY database - Superfamily
  120. ALDH-like [53719] (1)
    consists of two similar domains with 3 layers (a/b/a) each; duplication
    core: parallel beta-sheet of 5 strands, order 32145
    1. ALDH-like [53720] (2) picpic
      binds NAD differently from other NAD(P)-dependent oxidoreductases
      link to SUPERFAMILY database - Superfamily
  121. NadA-like [142753] (1)
    duplication; consists of three similar domains related by pseudo threefold symmetry; 3 layers, a/b/a; parallel beta sheet, order: 2134
    1. NadA-like [142754] (1) picpic
      link to SUPERFAMILY database - Superfamily
  122. Aconitase iron-sulfur domain [53731] (1)
    consists of three similar domains with 3 layers (a/b/a) each; duplication
    core: parallel beta-sheet of 5 strands, order 32145
    1. Aconitase iron-sulfur domain [53732] (1) picpic
      link to SUPERFAMILY database - Superfamily
  123. Phosphoglucomutase, first 3 domains [53737] (1)
    consists of three similar domains with 3 layers (a/b/a) each; duplication
    core: mixed beta-sheet of 4 strands, order 2134, strand 4 is antiparallel to the rest
    1. Phosphoglucomutase, first 3 domains [53738] (1) picpic
      link to SUPERFAMILY database - Superfamily
  124. FucI/AraA N-terminal and middle domains [53742] (1)
    consists of two domains of similar topology, 3 layers (a/b/a) each
    Domain 1 (1-173) has parallel beta-sheet of 5 strands, order 21345
    Domain 2 (174-355) has parallel beta-sheet of 4 strands, order 2134
    1. FucI/AraA N-terminal and middle domains [53743] (2) picpic
      link to SUPERFAMILY database - Superfamily
  125. YgbK-like [142763] (1)
    consists of two domains with partial topological similarity to the P-loop kinases but without the P-loop motif; the domain association results in the formation of a single mixed beta-sheet of 15 strands
    1. YgbK-like [142764] (1) picpic
      link to SUPERFAMILY database - Superfamily
  126. Phosphoglycerate kinase [53747] (1)
    consists of two non-similar domains, 3 layers (a/b/a) each
    Domain 1 has parallel beta-sheet of 6 strands, order 342156
    Domain 2 has parallel beta-sheet of 6 strands, order 321456
    1. Phosphoglycerate kinase [53748] (1) picpic
      link to SUPERFAMILY database - Superfamily
  127. UDP-Glycosyltransferase/glycogen phosphorylase [53755] (1)
    consists of two non-similar domains with 3 layers (a/b/a) each
    domain 1: parallel beta-sheet of 7 strands, order 3214567
    domain 2: parallel beta-sheet of 6 strands, order 321456
    1. UDP-Glycosyltransferase/glycogen phosphorylase [53756] (11) picpic
      link to SUPERFAMILY database - Superfamily
  128. Glutaminase/Asparaginase [53773] (1)
    consists of two non-similar alpha/beta domains, 3 layers (a/b/a) each
    Domain 1 has mixed beta-sheet of 6 strands, order 213456, strand 6 is antiparallel to the rest; left-handed crossover connection between strands 4 and 5
    Domain 2 has parallel beta-sheet of 4 strands, order 1234
    1. Glutaminase/Asparaginase [53774] (1) picpic
      link to SUPERFAMILY database - Superfamily
  129. Phosphofructokinase [53783] (1)
    consists of two non-similar domains, 3 layers (a/b/a) each
    Domain 1 has mixed sheet of 7 strands, order 3214567; strands 3 & 7 are antiparallel to the rest
    Domain 2 has parallel sheet of 4 strands, order 2314
    1. Phosphofructokinase [53784] (1) picpic
      link to SUPERFAMILY database - Superfamily
  130. Tetrapyrrole methylase [53789] (1)
    consists of two non-similar domains
    Domain 1 has parallel sheet of 5 strands, order 32415
    Domain 2 has mixed sheet of 5 strands, order 12534; strands 4 & 5 are antiparallel to the rest
    1. Tetrapyrrole methylase [53790] (1) picpic
      link to SUPERFAMILY database - Superfamily
  131. GckA/TtuD-like [82543] (1)
    consists of two non-similar domains
    Domain 1 has parallel sheet of 6 strands, order 321456, Rossmann-like topology
    Domain 2 has mixed sheet of 6 strands, order 126345; strands 5 and 6 are antiparallel to the rest; some similarity to CbiF Domain 2
    1. GckA/TtuD-like [82544] (1) picpic
      link to SUPERFAMILY database - Superfamily
  132. DAK1/DegV-like [82548] (1)
    2 different domains; d1: [core: 3 layers, a/b/a; parallel sheet of 5 strands, order: 2134]; D2: [2 layers, a/b; mixed sheet of 6 strands, order 321645; strands 2 and 6 are antiparallel to the rest]
    1. DAK1/DegV-like [82549] (2) picpic
      domain folds and architecture show some similarity to the tubulin-like GTPases; the nucleotide-binding sites of the Dihydroxyacetone kinase and tubulin families are different
      link to SUPERFAMILY database - Superfamily
  133. DHH phosphoesterases [64181] (1)
    consists of two non-similar domains
    Domain 1 has parallel sheet of 6 strands, order 321456
    Domain 2 has mixed sheet of 5 strands, order 12345; strands 1 & 4 are antiparallel to the rest
    1. DHH phosphoesterases [64182] (2) picpic
      constituent families have similar domain organization with variable interdomain linker and spatial arrangement of the domains
      link to SUPERFAMILY database - Superfamily
  134. Glycerate kinase I [110737] (1)
    consists of two different alpha/beta domains; (1) of the Flavodoxin-like fold (scop_cf 52171); (2) similar to the Restriction endonuclease-like fold (scop_cf 52979), inserted into domain 1
    1. Glycerate kinase I [110738] (1) picpic
      link to SUPERFAMILY database - Superfamily
  135. PEP carboxykinase-like [53794] (1)
    contains a P-loop NTP-binding motif; mixed beta-sheet folds into a barrel-like structure with helices packed on one side
    1. PEP carboxykinase-like [53795] (2) picpic
      link to SUPERFAMILY database - Superfamily
  136. PEP carboxykinase N-terminal domain [68922] (1)
    contains mixed beta-sheets; topology is partly similar to that of the catalytic C-terminal domain
    1. PEP carboxykinase N-terminal domain [68923] (1) picpic
      link to SUPERFAMILY database - Superfamily
  137. Chelatase-like [53799] (3)
    duplication: tandem repeat of two domains; 3 layers (a/b/a); parallel beta-sheet of 4 strands, order 2134
    1. Chelatase [53800] (3) picpic
      interdomain linker is short; swapping of C-terminal helices between the two domains
      link to SUPERFAMILY database - Superfamily
    2. "Helical backbone" metal receptor [53807] (4) picpic
      contains a long alpha helical insertion in the interdomain linker
      link to SUPERFAMILY database - Superfamily
    3. PrpR receptor domain-like [159800] (1) picpic
      recent PDB entry 2q5c belongs to this superfamily
  138. HemD-like [69617] (1)
    duplication: consists of two similar 'swapped' domain with 3 layers (a/b/a) each; parallel beta-sheet of 5 strands, order 21345
    1. HemD-like [69618] (1) picpic
      link to SUPERFAMILY database - Superfamily
  139. CAC2185-like [142794] (1)
    consists of two non-similar domains, 3 layers (a/b/a) each; d1 has parallel sheet of 4 strands, order 2134; d2 has parallel sheet of 5 strands, order 21345, and antiparallel meander sheet of 3 strands
    1. CAC2185-like [142795] (1) picpic
      link to SUPERFAMILY database - Superfamily
  140. Periplasmic binding protein-like I [53821] (1)
    consists of two similar intertwined domain with 3 layers (a/b/a) each: duplication
    parallel beta-sheet of 6 strands, order 213456
    1. Periplasmic binding protein-like I [53822] (1) picpic
      Similar in architecture to the superfamily II but partly differs in topology
      link to SUPERFAMILY database - Superfamily
  141. Periplasmic binding protein-like II [53849] (1)
    consists of two similar intertwined domain with 3 layers (a/b/a) each: duplication
    mixed beta-sheet of 5 strands, order 21354; strand 5 is antiparallel to the rest
    1. Periplasmic binding protein-like II [53850] (3) picpic
      Similar in architecture to the superfamily I but partly differs in topology
      link to SUPERFAMILY database - Superfamily
  142. Thiolase-like [53900] (1)
    consists of two similar domains related by pseudo dyad; duplication
    3 layers: a/b/a; mixed beta-sheet of 5 strands, order 32451; strand 5 is antiparallel to the rest
    1. Thiolase-like [53901] (2) picpic
      link to SUPERFAMILY database - Superfamily
  143. NIF3 (NGG1p interacting factor 3)-like [102704] (1)
    consist of two intertwined domains; duplication: contains two structural repeats of alpha-beta-(beta-alpha)3 motif with mixed beta-sheet, order: 1432, strand 1 is antiparallel to the rest
    1. NIF3 (NGG1p interacting factor 3)-like [102705] (1) picpic
      di-iron binding protein
      link to SUPERFAMILY database - Superfamily
  144. Fe-only hydrogenase [53919] (1)
    consist of two intertwined domains; contains partial duplication
    1. Fe-only hydrogenase [53920] (1) picpic
      link to SUPERFAMILY database - Superfamily
  145. ComB-like [142822] (1)
    contains of two similar intertwined domains related by pseudo dyad; duplication; core: 3 layers: a/b/a; parallel beta-sheet of 4 strands, order 1423
    1. ComB-like [142823] (1) picpic
      link to SUPERFAMILY database - Superfamily
  146. CoA-transferase family III (CaiB/BaiF) [89795] (1)
    consist of two different alpha/beta domains; N-terminal domain has a SurE-like topology with a left-handed beta-alpha-beta unit
    1. CoA-transferase family III (CaiB/BaiF) [89796] (1) picpic
      link to SUPERFAMILY database - Superfamily
  147. Cytidine deaminase-like [53926] (2)
    core: alpha-beta(2)-(alpha-beta)2; 3 layers (a/b/a); mixed beta-sheet of 4 strands, order 2134; strand 1 is antiparallel to the rest
    1. Cytidine deaminase-like [53927] (5) picpic
      contains extra C-terminal strand 5, order 21345
      link to SUPERFAMILY database - Superfamily
    2. JAB1/MPN domain [102712] (1) picpic
      link to SUPERFAMILY database - Superfamily

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