NDUFS2

The protein encoded by this gene is a core subunit of the mitochondrial membrane respiratory chain NADH dehydrogenase (complex I). Mammalian mitochondrial complex I is composed of at least 43 different subunits, 7 of which are encoded by the mitochondrial genome, and the rest are the products of nuclear genes. The iron-sulfur protein fraction of complex I is made up of 7 subunits, including this gene product. Complex I catalyzes the NADH oxidation with concomitant ubiquinone reduction and proton ejection out of the mitochondria. Mutations in this gene are associated with mitochondrial complex I deficiency. Alternatively spliced transcript variants encoding different isoforms have been found for this gene.

NADH:Ubiquinone Oxidoreductase Core Subunit S2

Core subunit of the mitochondrial membrane respiratory chain NADH dehydrogenase (Complex I) which catalyzes electron transfer from NADH through the respiratory chain, using ubiquinone as an electron acceptor (PubMed:30922174, PubMed:22036843).

Essential for the catalytic activity of complex I (PubMed:30922174, PubMed:22036843).

Essential for the assembly of complex I (By similarity).

Redox-sensitive, critical component of the oxygen-sensing pathway in the pulmonary vasculature which plays a key role in acute pulmonary oxygen-sensing and hypoxic pulmonary vasoconstriction (PubMed:30922174).

Plays an important role in carotid body sensing of hypoxia (By similarity).

Essential for glia-like neural stem and progenitor cell proliferation, differentiation and subsequent oligodendrocyte or neuronal maturation (By similarity).

Aerobic respiration Source: ComplexPortal
Cellular response to oxygen levels Source: UniProtKB
Gliogenesis Source: UniProtKB
Mitochondrial ATP synthesis coupled electron transport Source: CAFA
Mitochondrial ATP synthesis coupled proton transport Source: ComplexPortal
Mitochondrial electron transport, NADH to ubiquinone Source: UniProtKB
Mitochondrial respiratory chain complex I assembly Source: UniProtKB
Neural precursor cell proliferation Source: UniProtKB
Neurogenesis Source: UniProtKB
Response to oxidative stress Source: UniProtKB

Mitochondrion inner membrane

Mitochondrial complex I deficiency, nuclear type 6 (MC1DN6):
A form of mitochondrial complex I deficiency, the most common biochemical signature of mitochondrial disorders, a group of highly heterogeneous conditions characterized by defective oxidative phosphorylation, which collectively affects 1 in 5-10000 live births. Clinical disorders have variable severity, ranging from lethal neonatal disease to adult-onset neurodegenerative disorders. Phenotypes include macrocephaly with progressive leukodystrophy, non-specific encephalopathy, cardiomyopathy, myopathy, liver disease, Leigh syndrome, Leber hereditary optic neuropathy, and some forms of Parkinson disease. MC1DN6 transmission pattern is consistent with autosomal recessive inheritance.

Dimethylation at Arg-118 by NDUFAF7 takes place after NDUFS2 assembles into the complex I, leading to stabilize the early intermediate complex (PubMed:24089531, PubMed:24838397).