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. 1993 May;12(5):1775–1780. doi: 10.1002/j.1460-2075.1993.tb05825.x

Inherent asymmetry of the structure of F1-ATPase from bovine heart mitochondria at 6.5 A resolution.

J P Abrahams 1, R Lutter 1, R J Todd 1, M J van Raaij 1, A G Leslie 1, J E Walker 1
PMCID: PMC413396  PMID: 8491170

Abstract

ATP synthase, the assembly which makes ATP in mitochondria, chloroplasts and bacteria, uses transmembrane proton gradients generated by respiration or photosynthesis to drive the phosphorylation of ADP. Its membrane domain is joined by a slender stalk to a peripheral catalytic domain, F1-ATPase. This domain is made of five subunits with stoichiometries of 3 alpha: 3 beta: 1 gamma: 1 delta: 1 epsilon, and in bovine mitochondria has a molecular mass of 371,000. We have determined the 3-dimensional structure of bovine mitochondrial F1-ATPase to 6.5 A resolution by X-ray crystallography. It is an approximately spherical globule 110 A in diameter, on a 40 A stem which contains two alpha-helices in a coiled-coil. This stem is presumed to be part of the stalk that connects F1 with the membrane domain in the intact ATP synthase. A pit next to the stem penetrates approximately 35 A into the F1 particle. The stem and the pit are two examples of the many asymmetric features of the structure. The central element in the asymmetry is the longer of the two alpha-helices in the stem, which extends for 90 A through the centre of the assembly and emerges on top into a dimple 15 A deep. Features with threefold and sixfold symmetry, presumed to be parts of homologous alpha and beta subunits, are arranged around the central rod and pit, but the overall structure is asymmetric. The central helix provides a possible mechanism for transmission of conformational changes induced by the proton gradient from the stalk to the catalytic sites of the enzyme.

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