NADH dehydrogenase [ubiquinone] iron-sulfur protein 4 (NDUFS4)

NADH dehydrogenase [ubiquinone] iron-sulfur protein 4 (NDUFS4) is a nuclear-encoded accessory subunit of mitochondrial complex I, the first and largest enzyme of the respiratory electron transport chain. It plays a vital role in the assembly and structural stability of the complex, specifically bridging the N-module (NADH binding) and Q-module (ubiquinone binding) to facilitate electron transfer and proton pumping for ATP production. Mutations in the NDUFS4 gene are a frequent cause of Leigh syndrome, a severe, early-onset neurodegenerative disorder characterized by bilateral brain lesions, motor regression, and metabolic acidosis. Beyond its role in genetic disease, NDUFS4 and the broader complex I are significant pharmacological targets; for instance, metformin inhibits complex I to manage type 2 diabetes, while experimental inhibitors like CP2 are being explored for neuroprotective effects in Alzheimer's disease. Conversely, therapeutic research for NDUFS4 deficiency focuses on gene therapy, NAD+ precursors like NMN, and mTOR inhibitors like rapamycin to bypass or compensate for mitochondrial dysfunction.

Other names

Complex I-18 kDaCI-18 kDaNADH-ubiquinone oxidoreductase 18 kDa subunitComplex I-AQDQCI-AQDQMC1DN1AQDQ

Inhibition of mitochondrial complex I activity; stabilization of complex I assembly; modulation of the NAD+/NADH ratio; inhibition of mTOR signaling to mitigate mitochondrial distress.