TRX-like [2Fe-2S] Ferredoxin (Fd) family, NADH:ubiquinone oxidoreductase (Nuo) subunit E family, Tungsten-containing formate dehydrogenase (W-FDH) beta subunit; composed of proteins similar to the W-FDH beta subunit of Methylobacterium extorquens. W-FDH is a heterodimeric NAD-dependent enzyme catalyzing the conversion of formate to carbon dioxide. The beta subunit is a fusion protein containing an N-terminal NuoE domain and a C-terminal NuoF domain. NuoE and NuoF are components of Nuo, a multisubunit complex catalyzing the electron transfer of NADH to quinone coupled with the transfer of protons across the membrane. Electrons are transferred from NADH to quinone through a chain of iron-sulfur clusters in Nuo, including the [2Fe-2S] cluster in NuoE and the [4Fe-4S] cluster in NuoF. In addition, NuoF is also the NADH- and FMN-binding subunit. Similarly, the beta subunit of W-FDH is most likely involved in the electron transport chain during the NAD-dependent oxidation of formate.
Jiyao W et al.(2023). "The conserved domain database in 2023.",