NADH:ubiquinone oxidoreductase-like, 20kDa subunit (IPR006137)

Short name: NADH_UbQ_OxRdtase-like_20kDa

Overlapping homologous superfamilies

Domain relationships



This entry represents a Rossmann fold-type domain found in NADH:ubiquinone oxidoreductase 20kDa subunit, [NiFe] hydrogenase small subunit and coenzyme F420 hydrogenase subunit gamma.

NADH:ubiquinone oxidoreductase (complex I) (EC: is a respiratory-chain enzyme that catalyses the transfer of two electrons from NADH to ubiquinone in a reaction that is associated with proton translocation across the membrane (NADH + ubiquinone = NAD+ + ubiquinol) [PMID: 1470679]. Among the many polypeptide subunits that make up complex I, there is one with a molecular weight of 20kDa (in mammals) [PMID: 1577158], which is a component of the iron-sulphur (IP) fragment of the enzyme. It seems to bind a 4Fe-4S iron-sulphur cluster.

The great majority of hydrogenases (H2ases) contain iron-sulfur clusters and two metal atoms at their active centre, Ni and Fe in the case of the [NiFe]-H2ases. They catalyse the reversible oxidation of hydrogen gas and play a central role in microbial energy metabolism; in addition to their role in fermentation and H2 respiration [PMID: 15119826]. The small subunit (chain A) contains the Fe4S4 clusters, whereas the large subunit (chain B) binds the binuclear NiFe active site [PMID: 20026074].

GO terms

Biological Process

GO:0055114 oxidation-reduction process

Molecular Function

GO:0051536 iron-sulfur cluster binding

Cellular Component

No terms assigned in this category.

Contributing signatures

Signatures from InterPro member databases are used to construct an entry.