8h9r
Human ATP synthase state 3b subregion 2
Structural highlights
FunctionAT5F1_HUMAN Mitochondrial membrane ATP synthase (F(1)F(0) ATP synthase or Complex V) produces ATP from ADP in the presence of a proton gradient across the membrane which is generated by electron transport complexes of the respiratory chain. F-type ATPases consist of two structural domains, F(1) - containing the extramembraneous catalytic core, and F(0) - containing the membrane proton channel, linked together by a central stalk and a peripheral stalk. During catalysis, ATP synthesis in the catalytic domain of F(1) is coupled via a rotary mechanism of the central stalk subunits to proton translocation. Part of the complex F(0) domain and the peripheric stalk, which acts as a stator to hold the catalytic alpha(3)beta(3) subcomplex and subunit a/ATP6 static relative to the rotary elements. Publication Abstract from PubMedBiological energy currency ATP is produced by F(1)F(o)-ATP synthase. However, the molecular mechanism for human ATP synthase action remains unknown. Here, we present snapshot images for three main rotational states and one substate of human ATP synthase using cryoelectron microscopy. These structures reveal that the release of ADP occurs when the beta subunit of F(1)F(o)-ATP synthase is in the open conformation, showing how ADP binding is coordinated during synthesis. The accommodation of the symmetry mismatch between F(1) and F(o) motors is resolved by the torsional flexing of the entire complex, especially the gamma subunit, and the rotational substep of the c subunit. Water molecules are identified in the inlet and outlet half-channels, suggesting that the proton transfer in these two half-channels proceed via a Grotthus mechanism. Clinically relevant mutations are mapped to the structure, showing that they are mainly located at the subunit-subunit interfaces, thus causing instability of the complex. Structure of the human ATP synthase.,Lai Y, Zhang Y, Zhou S, Xu J, Du Z, Feng Z, Yu L, Zhao Z, Wang W, Tang Y, Yang X, Guddat LW, Liu F, Gao Y, Rao Z, Gong H Mol Cell. 2023 Jun 15;83(12):2137-2147.e4. doi: 10.1016/j.molcel.2023.04.029. , Epub 2023 May 26. PMID:37244256[1] From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. References
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