This is the C-terminal domain of predicted bacterial oxidoreductases. This domain is related to Pfam:PF02894, and it is likely to be an alpha/beta-domain involved in substrate binding and oligomerization [1].

1: Structural and functional features of the NAD(P) dependent Gfo/Idh/MocA protein family oxidoreductases. Taberman H, Parkkinen T, Rouvinen J; Protein Sci. 2016;25:778-786. PMID:26749496