This family includes the N terminal structural domain of the pyruvate ferredoxin oxidoreductase. This domain binds thiamine diphosphate, and along with domains II and IV, is involved in inter subunit contacts [3]. The family also includes pyruvate flavodoxin oxidoreductase as encoded by the nifJ gene in cyanobacterium which is required for growth on molecular nitrogen when iron is limited [2].

1: Molecular and phylogenetic characterization of pyruvate and 2-ketoisovalerate ferredoxin oxidoreductases from Pyrococcus furiosus and pyruvate ferredoxin oxidoreductase from Thermotoga maritima. Kletzin A, Adams MW; J Bacteriol 1996;178:248-257. PMID:8550425

2: Growth of the cyanobacterium Anabaena on molecular nitrogen: NifJ is required when iron is limited. Bauer CC, Scappino L, Haselkorn R; Proc Natl Acad Sci U S A 1993;90:8812-8816. PMID:8415612

3: Crystal structures of the key anaerobic enzyme pyruvate:ferredoxin oxidoreductase, free and in complex with pyruvate. Chabriere E, Charon MH, Volbeda A, Pieulle L, Hatchikian EC, Fontecilla-Camps JC; Nat Struct Biol 1999;6:182-190. PMID:10048931