Members of this family are found in prokaryotic acetaldehyde dehydrogenase (acylating), and adopt a structure consisting of an alpha-beta-alpha-beta(3) core. They mediate dimerisation of the protein [1].

1: Crystal structure of a bifunctional aldolase-dehydrogenase: sequestering a reactive and volatile intermediate. Manjasetty BA, Powlowski J, Vrielink A; Proc Natl Acad Sci U S A 2003;100:6992-6997. PMID:12764229