7y5c
Cryo-EM structure of F-ATP synthase from Mycolicibacterium smegmatis (rotational state 2)Cryo-EM structure of F-ATP synthase from Mycolicibacterium smegmatis (rotational state 2)
Structural highlights
FunctionATPB_MYCS2 Produces ATP from ADP in the presence of a proton gradient across the membrane. The catalytic sites are hosted primarily by the beta subunits.[HAMAP-Rule:MF_01347] Publication Abstract from PubMedThe F(1)F(O)-ATP synthase is required for the viability of tuberculosis (TB) and nontuberculous mycobacteria (NTM) and has been validated as a drug target. Here, we present the cryo-EM structures of the Mycobacterium smegmatis F(1)-ATPase and the F(1)F(O)-ATP synthase with different nucleotide occupation within the catalytic sites and visualize critical elements for latent ATP hydrolysis and efficient ATP synthesis. Mutational studies reveal that the extended C-terminal domain (alphaCTD) of subunit alpha is the main element for the self-inhibition mechanism of ATP hydrolysis for TB and NTM bacteria. Rotational studies indicate that the transition between the inhibition state by the alphaCTD and the active state is a rapid process. We demonstrate that the unique mycobacterial gamma-loop and subunit delta are critical elements required for ATP formation. The data underline that these mycobacterium-specific elements of alpha, gamma, and delta are attractive targets, providing a platform for the discovery of species-specific inhibitors. Structural Elements Involved in ATP Hydrolysis Inhibition and ATP Synthesis of Tuberculosis and Nontuberculous Mycobacterial F-ATP Synthase Decipher New Targets for Inhibitors.,Wong CF, Saw WG, Basak S, Sano M, Ueno H, Kerk HW, Litty D, Ragunathan P, Dick T, Muller V, Noji H, Gruber G Antimicrob Agents Chemother. 2022 Dec 20;66(12):e0105622. doi: , 10.1128/aac.01056-22. Epub 2022 Nov 29. PMID:36445139[1] From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. References
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