期刊
BIOCHIMICA ET BIOPHYSICA ACTA-BIOENERGETICS
卷 1797, 期 8, 页码 1439-1448出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.bbabio.2010.02.024
关键词
Oxidative phosphorylation; F1F0-ATP synthase; Dimeric mitochondrial complex V; Chlorophycean algae; Stator stalk; Chlamydomonas reinhardtii; Polytomella sp.; ASA subunits
资金
- CONACyT (Mexico) [56619]
- DGAPA [IN217108]
- CNPq
- FAPERJ (Brazil)
- Brazilian Synchrotron Light Laboratory (LNLS) [D11A-SAXS1-5944, D11A-SAXS1-6714, D11A-SAXS1-7672]
- Belgian F.R.S.-FNRS [2.4638.05, 2.4601.08, 1.5.255.08, 1.C057.09, F.4735.06]
- UNAM (Mexico)
Mitochondrial F1F0-ATP synthase of chlorophycean algae is a dimeric complex of 1600 kDa constituted by 17 different subunits with varying stoichiometries, 8 of them conserved in all eukaryotes and 9 that seem to be unique to the algal lineage (subunits ASA1-9). Two different models proposing the topological assemblage of the nine ASA subunits in the ATP synthase of the colorless alga Polytomella sp. have been put forward. Here, we readdressed the overall topology of the enzyme with different experimental approaches: detection of close vicinities between subunits based on cross-linking experiments and dissociation of the enzyme into subcomplexes, inference of subunit stoichiometry based on cysteine residue labelling, and general three-dimensional structural features of the complex as obtained from small-angle X-ray scattering and electron microscopy image reconstruction. Based on the available data, we refine the topological arrangement of the subunits that constitute the mitochondrial ATP synthase of Polytomella sp. (C) 2010 Elsevier B.V. All rights reserved.
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