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标题：Arrangement of subunits in intact mammalian mitochondrial ATP synthase determined by cryo-EM
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作者：Lindsay A. Baker ; Ian N. Watt ; Michael J. Runswick 等
期刊名称：Proceedings of the National Academy of Sciences
印刷版ISSN：0027-8424
电子版ISSN：1091-6490
出版年度：2012
卷号：109
期号：29
页码：11675-11680
DOI：10.1073/pnas.1204935109
语种：English
出版社：The National Academy of Sciences of the United States of America
摘要：Mitochondrial ATP synthase is responsible for the synthesis of ATP, a universal energy currency in cells. Whereas X-ray crystallography has revealed the structure of the soluble region of the complex and the membrane-intrinsic c-subunits, little is known about the structure of the six other proteins (a, b, f, A6L, e, and g) that comprise the membrane-bound region of the complex in animal mitochondria. Here, we present the structure of intact bovine mitochondrial ATP synthase at [~]18 A resolution by electron cryomicroscopy of single particles in amorphous ice. The map reveals that the a-subunit and c8-ring of the complex interact with a small contact area and that the b-subunit spans the membrane without contacting the c8-ring. The e- and g-subunits extend from the a-subunit density distal to the c8-ring. The map was calculated from images of a preparation of the enzyme solubilized with the detergent dodecyl maltoside, which is visible in electron cryomicroscopy maps. The structure shows that the micelle surrounding the complex is curved. The observed bend in the micelle of the detergent-solubilized complex is consistent with previous electron tomography experiments and suggests that monomers of ATP synthase are sufficient to produce curvature in lipid bilayers.