The domain within your query sequence starts at position 40 and ends at position 102; the E-value for the NDUF_B7 domain shown below is 3.8e-32.



PFAM accession number:PF05676
Interpro abstract (IPR008698):

This family consists of several NADH-ubiquinone oxidoreductase B18 subunit proteins from different eukaryotic organisms. Oxidative phosphorylation is the well-characterised process in which ATP, the principal carrier of chemical energy of individual cells, is produced due to a mitochondrial proton gradient formed by the transfer of electrons from NADH and FADH2 to molecular oxygen. The oxidative phosphorylation (OXPHOS) system is located in the mitochondrial inner membrane and consists of five multi-subunit enzyme complexes and two small electron carriers: coenzyme Q10 and cytochrome C. At least 70 structural proteins involved in the formation of the whole OXPHOS system are encoded by nuclear genes, whereas 13 structural proteins are encoded by the mitochondrial genome. Deficiency of NADH ubiquinone oxidoreductase, the first enzyme complex of the mitochondrial respiratory chain, is one of the most frequent causes of Homo sapiens mitochondrial encephalomyopathies [ (PUBMED:10830904) ].

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) [ (PUBMED:1470679) ]. Complex I is a major source of reactive oxygen species (ROS) that are predominantly formed by electron transfer from FMNH(2). Complex I is found in bacteria, cyanobacteria (as a NADH-plastoquinone oxidoreductase), archaea [ (PUBMED:10940377) ], mitochondria, and in the hydrogenosome, a mitochondria-derived organelle. In general, the bacterial complex consists of 14 different subunits, while the mitochondrial complex contains homologues to these subunits in addition to approximately 31 additional proteins [ (PUBMED:18394423) ].

GO component:mitochondrion (GO:0005739)
GO function:NADH dehydrogenase activity (GO:0003954), NADH dehydrogenase (ubiquinone) activity (GO:0008137)

This is a PFAM domain. For full annotation and more information, please see the PFAM entry NDUF_B7