Coenzyme F420 hydrogenase (EC:1.12.99.1) reduces the low-potential two-electron acceptor coenzyme F420. This family contains the C termini of F420 hydrogenase and dehydrogenase beta subunits [1], [2]. The N terminus of Methanobacterium formicicum formate dehydrogenase beta chain (EC:1.2.1.2, Swiss:P06130) is also a member of this family [3]. This region is often found in association with the 4Fe-4S binding domain, fer4 (Pfam:PF00037).

1: Cloning, sequence determination, and expression of the genes encoding the subunits of the nickel-containing 8-hydroxy-5-deazaflavin reducing hydrogenase from Methanobacterium thermoautotrophicum delta H. Alex LA, Reeve JN, Orme-Johnson WH, Walsh CT; Biochemistry 1990;29:7237-7244. PMID:2207102

2: The F420H2 dehydrogenase from Methanosarcina mazei is a Redox-driven proton pump closely related to NADH dehydrogenases. Baumer S, Ide T, Jacobi C, Johann A, Gottschalk G, Deppenmeier U; J Biol Chem 2000;275:17968-17973. PMID:10751389

3: Cloning, expression, and nucleotide sequence of the formate dehydrogenase genes from Methanobacterium formicicum. Shuber AP, Orr EC, Recny MA, Schendel PF, May HD, Schauer NL, Ferry JG; J Biol Chem 1986;261:12942-12947. PMID:3531194