This domain family is found in bacteria and archaea, and is approximately 70 amino acids in length. The family is found in association with Pfam:PF02775. There are two completely conserved residues (A and G) that may be functionally important. PFO is involved in carbon dioxide fixation via a reductive TCA cycle. It forms a heterodimer (alpha/beta). The beta subunit has binding motifs for Fe-S clusters and thiamine pyrophosphate.

1: The genes for anabolic 2-oxoglutarate: ferredoxin oxidoreductase from Hydrogenobacter thermophilus TK-6. Yun NR, Arai H, Ishii M, Igarashi Y; Biochem Biophys Res Commun. 2001;282:589-594. PMID:11401501