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• W2007336841 endingPage "1358" @default.
• W2007336841 startingPage "1349" @default.
• W2007336841 abstract "Abstract The structure and function of the cytochrome b 6 f complex is considered in the context of recent crystal structures of the complex as an eight subunit, 220 kDa symmetric dimeric complex obtained from the thermophilic cyanobacterium, Mastigocladus laminosus , and the green alga, Chlamydomonas reinhardtii . A major problem confronted in crystallization of the cyanobacterial complex, proteolysis of three of the subunits, is discussed along with initial efforts to identify the protease. The evolution of these cytochrome complexes is illustrated by conservation of the hydrophobic heme‐binding transmembrane domain of the cyt b polypeptide between b 6 f and bc 1 complexes, and the rubredoxin‐like membrane proximal domain of the Rieske [2Fe‐2S] protein. Pathways of coupled electron and proton transfer are discussed in the framework of a modified Q cycle, in which the heme c n , not found in the bc 1 complex, but electronically tightly coupled to the heme b n of the b 6 f complex, is included. Crystal structures of the cyanobacterial complex with the quinone analogue inhibitors, NQNO or tridecyl‐stigmatellin, show the latter to be ligands of heme c n , implicating heme c n as an n ‐side plastoquinone reductase. Existing questions include (a) the details of the shuttle of: (i) the [2Fe‐2S] protein between the membrane‐bound PQH 2 electron/H + donor and the cytochrome f acceptor to complete the p ‐side electron transfer circuit; (ii) PQ/PQH 2 between n ‐ and p ‐sides of the complex across the intermonomer quinone exchange cavity, through the narrow portal connecting the cavity with the p ‐side [2Fe‐2S] niche; (b) the role of the n ‐side of the b 6 f complex and heme c n in regulation of the relative rates of noncyclic and cyclic electron transfer. The likely presence of cyclic electron transport in the b 6 f complex, and of heme c n in the firmicute bc complex suggests the concept that hemes b n ‐ c n define a branch point in bc complexes that can support electron transport pathways that differ in detail from the Q cycle supported by the bc 1 complex." @default.
• W2007336841 created "2016-06-24" @default.
• W2007336841 creator A5005727731 @default.
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• W2007336841 creator A5079948516 @default.
• W2007336841 creator A5084692358 @default.
• W2007336841 date "2008-11-01" @default.
• W2007336841 modified "2023-10-16" @default.
• W2007336841 title "Structure-Function of the Cytochrome<i>b</i>₆<i>f</i>Complex^†" @default.
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• W2007336841 doi "https://doi.org/10.1111/j.1751-1097.2008.00444.x" @default.
• W2007336841 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/19067956" @default.

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