ATP synthase subunit alpha, mitochondrial (ATP5F1A (human gene), ATP5A1 (human protein, UniProt P25705); also known in some contexts as ATP5A)

ATP synthase subunit alpha is a major non-catalytic subunit of the mitochondrial F1F0-ATP synthase complex, forming part of the hexameric ring (three alpha and three beta subunits) that encloses the catalytic sites for ATP synthesis. While the beta subunits bear catalytic activity, the alpha subunits contribute to nucleotide binding and structural stabilization. The enzyme harnesses the energy from a transmembrane proton gradient, generated by the respiration chain, to rotate its central stalk and drive conformational changes that synthesize ATP from ADP and inorganic phosphate. Dysfunction or inhibition of ATP synthase, or its alpha subunit, disrupts cellular metabolism and is a cause or consequence of many disease states. The mitochondrial form is essential for all eukaryotic energy metabolism, while bacterial and chloroplastic forms serve similar functions in their respective systems.

Other names

ATP synthase F1 subunit alphaATP synthase alpha chainATP5AATP5A1ATPMATP5AL2ATP synthase F(1) complex subunit alpha, mitochondrial

Inhibition of proton channel function, blocking ATP synthesis; Allosteric inhibition of ATP hydrolysis or synthesis site via alpha subunit conformation; Rotational stalling or conformational locking within F1 catalytic domain