Proton-translocating F-type ATPase (F-ATPase)

Proton-translocating F-type ATPase (F-ATPase) is a multi-subunit enzyme complex found in bacterial plasma membranes, mitochondrial inner membranes (as Complex V), and chloroplast thylakoid membranes[1][6]. It converts the energy from a transmembrane proton (H⁺) gradient into chemical energy by synthesizing ATP from ADP and inorganic phosphate. The enzyme consists of two major domains: Fo, a membrane-embedded proton channel that allows protons to move down their electrochemical gradient, and F1, a peripheral catalytic domain that synthesizes ATP using the resulting rotational energy[1][6]. The enzyme operates as a rotary molecular motor with conserved subunit composition and mechanism across species. Inhibition of F-ATPase (e.g., by oligomycin) completely blocks ATP production through oxidative phosphorylation, highlighting both its essential biological function and its potential as a therapeutic target in certain pathogens[1][5][6]. Dysfunction or inhibition in humans leads to severe and often fatal energy deficiency syndromes.

Other names

F-type ATPaseF1Fo ATP synthaseComplex V (in mitochondria)ATP synthaseRotary ATPase

Inhibition of proton translocation through Fo subunit blocks ATP synthesis (e.g., oligomycin) Disruption of proton gradient/coupling blocks ATP production, causing cellular energy failure