This CD includes formate dehydrogenases (Fdh) H and N; nitrate reductases, Nap and Nas; and other related proteins. Formate dehydrogenase H is a component of the anaerobic formate hydrogen lyase complex and catalyzes the reversible oxidation of formate to CO2 with the release of a proton and two electrons. Formate dehydrogenase N (alpha subunit) is the major electron donor to the bacterial nitrate respiratory chain and nitrate reductases, Nap and Nas, catalyze the reduction of nitrate to nitrite. This CD (MopB_CT_Fdh-Nap-like) is of the conserved molybdopterin_binding C-terminal (MopB_CT) region present in many, but not all, MopB homologs.
Jiyao W et al.(2023). "The conserved domain database in 2023.",