Download MendeleyMolecular basis of V-ATPase inhibition by bafilomycin A1.
Wang, R., Wang, J., Hassan, A., Lee, C.H., Xie, X.S., Li, X.(2021) Nat Commun 12: 1782-1782
- PubMed: 33741963
- DOI: https://doi.org/10.1038/s41467-021-22111-5
- Primary Citation of Related Structures:
7KHR - PubMed Abstract:
Pharmacological inhibition of vacuolar-type H + -ATPase (V-ATPase) by its specific inhibitor can abrogate tumor metastasis, prevent autophagy, and reduce cellular signaling responses. Bafilomycin A1, a member of macrolide antibiotics and an autophagy inhibitor, serves as a specific and potent V-ATPases inhibitor. Although there are many V-ATPase structures reported, the molecular basis of specific inhibitors on V-ATPase remains unknown. Here, we report the cryo-EM structure of bafilomycin A1 bound intact bovine V-ATPase at an overall resolution of 3.6-Å. The structure reveals six bafilomycin A1 molecules bound to the c-ring. One bafilomycin A1 molecule engages with two c subunits and disrupts the interactions between the c-ring and subunit a, thereby preventing proton translocation. Structural and sequence analyses demonstrate that the bafilomycin A1-binding residues are conserved in yeast and mammalian species and the 7'-hydroxyl group of bafilomycin A1 acts as a unique feature recognized by subunit c.
Organizational Affiliation:
Department of Molecular Genetics, University of Texas Southwestern Medical Center, Dallas, TX, USA.
