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• W2897832825 abstract "Structure–function studies of the cytochrome b6f complex, the central hetero-oligomeric membrane protein complex in the electron transport chain of oxygenic photosynthesis, which formed the basis for a high-resolution (2.5 Å) crystallographic solution of the complex, are described. Structure–function differences between the structure of subunits of the bc complexes, b6f, and bc1 from mitochondria and photosynthetic bacteria, which are often assumed to function identically, are discussed. Major differences which suggest that quinone-dependent electron transport pathways can vary in b6f and bc1 complexes are as follows: (a) an additional c-type heme, cn, and bound single copies of chlorophyll a and β-carotene in the b6f complex; and (b) a cyclic electron transport pathway that encompasses the b6f and PSI reaction center complexes. The importance of including lipid in crystallization of the cytochrome complex, or with any hetero-oligomeric membrane protein complex, is emphasized, and consequences to structure–function of b6f being a lipoprotein complex discussed, including intra-protein dielectric heterogeneity and resultant pathways of trans-membrane electron transport. The role of the b6f complex in trans-membrane signal transduction from reductant generated on the p-side of the electron transport chain to the regulation of light energy to the two photosystems by trans-side phosphorylation of the light-harvesting chlorophyll protein is presented. Regarding structure aspects relevant to plastoquinol-quinone entrance-egress: (i) modification of the p-side channel for plastoquinone access to the iron-sulfur protein would change the rate-limiting step in electron transport; (ii) the narrow niche for entry of plastoquinol into b6f from the PSII reaction center complex would seem to require close proximity between the complexes." @default.
• W2897832825 created "2018-10-26" @default.
• W2897832825 creator A5084692358 @default.
• W2897832825 date "2018-10-11" @default.
• W2897832825 modified "2023-10-17" @default.
• W2897832825 title "Structure–function of the cytochrome b6f lipoprotein complex: a scientific odyssey and personal perspective" @default.
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• W2897832825 doi "https://doi.org/10.1007/s11120-018-0585-x" @default.
• W2897832825 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/6510485" @default.
• W2897832825 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/30311133" @default.
• W2897832825 hasPublicationYear "2018" @default.
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