F-type proton-transporting ATPase of Streptococcus mutans (F-ATPase)

The F-type proton-transporting ATPase of *Streptococcus mutans* (F-ATPase) is a multi-subunit, membrane-bound enzyme complex responsible for extruding protons (H⁺) from the cytoplasm in exchange for hydrolyzing ATP. This process maintains a neutral to slightly basic intracellular pH despite the highly acidic environment created by carbohydrate fermentation in dental plaque, thus enabling S. mutans to survive, metabolize, and outcompete less acid-tolerant oral bacteria. The F-ATPase is upregulated in response to environmental acidification (optimal activity at pH 6.0), and its gene cluster and structure are highly conserved with F-ATPases from other bacteria but show specific regulatory adaptations in S. mutans. Activity of this enzyme is critical for the aciduric (acid-tolerant) phenotype that underlies S. mutans virulence in dental caries and is a validated therapeutic target for novel antibacterial agents against tooth decay. Several plant-derived compounds, such as curcumin and piceatannol, have been shown to inhibit S. mutans F-ATPase and suppress bacterial survival under acid stress. Selectivity for the bacterial enzyme over mammalian homologs is a key consideration in drug development targeting this enzyme.

Other names

F1F0-ATPaseF0F1-ATPaseH+-translocating ATPaseproton-pumping ATPase

Inhibitors block ATP hydrolysis activity and proton translocation, disrupting intracellular pH homeostasis, reducing S. mutans growth and survival in acidic environments.