NADH:ubiquinone oxidoreductase complex assembly factor 5 (NDUFAF5)

NADH:ubiquinone oxidoreductase complex assembly factor 5 (NDUFAF5) is a mitochondrial matrix protein associated with the inner membrane that plays a key role in the early assembly steps of respiratory complex I. It acts as an arginine hydroxylase (and possibly a methyltransferase), catalyzing hydroxylation of a critical arginine residue (Arg-73) on the NDUFS7 subunit. This post-translational modification ensures proper assembly and function of complex I, the starting point for mitochondrial electron transport and ATP production. Mutations in NDUFAF5 lead to defective complex I biogenesis, severely impaired mitochondrial energy metabolism, and a range of mitochondrial diseases including Leigh syndrome and complex I deficiency. NDUFAF5 is vital for cellular energy maintenance, and its dysfunction triggers compensatory changes, such as increased autophagy. Currently, there are no approved drugs directly targeting NDUFAF5, and its essential nature poses therapeutic challenges.

Other names

Arginine-hydroxylase NDUFAF5, mitochondrialC20orf7dJ842G6.1NADH dehydrogenase [ubiquinone] 1 alpha subcomplex assembly factor 5Putative methyltransferase NDUFAF5MC1DN16bA526K24.2

No direct small molecule mechanism established. In theory, drugs (or gene therapy) would act by restoring hydroxylation or methyltransferase activity, or by compensating for the assembly defect in complex I