ATP synthase subunit alpha, mitochondrial (ATP5F1A) (ATP5F1A)

The mitochondrial ATP synthase alpha-subunit, encoded by the ATP5F1A gene, is a core component of the F1 catalytic domain of the ATP synthase complex (Complex V) located in the inner mitochondrial membrane (UniProt: P25705). It plays a fundamental role in energy metabolism by facilitating the synthesis of ATP from ADP and inorganic phosphate, driven by the proton gradient across the membrane (PubMed: 29166580). Beyond its canonical role in the mitochondria, the alpha-subunit is known to be ectopically expressed on the surface of various cells, including tumor and endothelial cells, where it acts as a receptor for ligands like angiostatin, influencing angiogenesis and tumor growth (PubMed: 10591212). Mutations in this subunit are linked to severe mitochondrial disorders, such as neonatal-onset encephalopathy and hypertrophic cardiomyopathy, due to impaired oxidative phosphorylation (NCBI Gene: 498). In therapeutic contexts, it is explored as a target for anti-cancer agents and in the study of autoimmune conditions like systemic lupus erythematosus, where surface expression triggers immune responses (PubMed: 24554717). However, the essential nature of ATP synthase in nearly all eukaryotic cells presents significant challenges for drug safety, as non-specific inhibition can lead to profound systemic toxicity and metabolic failure.

Other names

ATP5A1ATP5AATP synthase alpha chain, mitochondrialMC5FE1MOM2Complex V subunit alpha

Inhibition of the F1 catalytic subunit to prevent ATP synthesis or hydrolysis; modulation of the mitochondrial permeability transition pore (mPTP) opening; and serving as a cell-surface receptor for anti-angiogenic factors when ectopically expressed (PubMed: 10591212, 16407415).