Fold: Ribbon-helix-helix [47597]
core: 4 helices; array of 2 hairpins, opened
Superfamily: Ribbon-helix-helix [47598]
formerly Met repressor-like; dimeric proteins; the N-termini form a small beta-sheet ribbon uperfamily
Family: PutA pre-N-terminal region-like [158485]
in PutA it forms a separate ribbon-helix-helix domain connected to the N-terminal enzymatic domain by a flexible linker