NADH-ubiquinone oxidoreductase chain 5 (MT-ND5)

NADH-ubiquinone oxidoreductase chain 5 (MT-ND5) is a core hydrophobic subunit of the mitochondrial membrane respiratory chain NADH dehydrogenase, also known as Complex I. It is one of the seven subunits encoded by the mitochondrial DNA (mtDNA) and is essential for the assembly and functional activity of the complex [UniProt: P03915]. The primary biological role of MT-ND5 is to facilitate the transfer of electrons from NADH to ubiquinone, a process coupled with the translocation of protons across the inner mitochondrial membrane to establish the electrochemical gradient required for ATP production [PubMed: 15070424]. Mutations in the MT-ND5 gene are clinically significant, often leading to severe mitochondrial encephalomyopathies such as MELAS syndrome and Leigh syndrome due to defective oxidative phosphorylation [PubMed: 21835300]. While MT-ND5 is not a typical target for small molecule drug discovery, it is a site of action for various inhibitors like rotenone and is indirectly affected by metabolic drugs such as metformin [PubMed: 10839993]. Furthermore, MT-ND5 is increasingly studied in oncology, as mutations in this subunit can contribute to the metabolic reprogramming of cancer cells, making it a potential focus for diagnostic and therapeutic strategies in mitochondrial medicine [PubMed: 25659444].

Other names

NADH dehydrogenase subunit 5Complex I subunit ND5MTND5Mitochondrially encoded NADH:ubiquinone oxidoreductase core subunit 5

Inhibition of the mitochondrial respiratory chain Complex I, which prevents the transfer of electrons from NADH to ubiquinone and halts the associated proton pumping, thereby disrupting the mitochondrial membrane potential and ATP production.