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11-SEPTEMBER-2008 13:54:10 - b6f complex Cytochrome b6f complex 1q90. Hydrocarbon boundaries of the lipid bilayer are shown by red and blue dots. Cytochrome b6f complex 1q90. Hydrocarbon boundaries of the lipid bilayer are shown by red and blue dots. The cytochrome b6f complex plastoquinol-plastocyanin reductase; EC 1.10.99.1 of chloroplasts and cyanobacteria transfers electrons between the two reaction center complexes of oxygenic photosynthetic membranes, photosystem I and photosystem II, and participates in formation of the transmembrane electrochemical proton gradient by also transferring protons from the stromal to the internal lumen compartment. It is minimally composed of four subunits: cytochrome b6, carrying a low- and a high-potential heme groups bL and bH; cytochrome f with one covalently bound heme c; Rieske iron-sulfur protein ISP containing a single Fe2S2 cluster; and subunit IV 17 kDa protein. In its structure and functions, the cytochrome b6f complex bears extensive analogy to the cytochrome bc1 complex of mitochondria and photosynthetic purple bacteria. However, there are important differences between the two complexes: The single-polypeptide cytochrome b in the cytochrome bc1 complex corresponds to cytochrome b6 and subunit IV in the cytochrome b6f complex Cytochrome f and cytochrome c1 are not homologous The cytochrome b6f complex contains additional chromophores, chlorophyll a, β-carotene and atypical heme ci heme x, the latter being linked by a single thioether bond to cytochrome b6 The cytochrome b6f complex is responsible for non-cyclic 1 and cyclic 2 electron transfer between two mobile redox carriers, plastoquinol QH2 and plastocyanin: H2O → photosystem II → QH2 → Cyt b6f → plastocyanin → photosystem I → NADP+ 1 QH2 → Cyt b6f → plastocyanin → photosystem I → Q 2 Electron transfer is coupled with the translocation of protons across the membrane, thus generating proton-motive force in the form of an electrochemical proton potential which can drive ATP synthesis. The crystal structure of cytochrome b6f complexes from Chlamydomonas reinhardtii and Mastigocladus laminosus have been determined. References Cramer, W.A., Martinez, S.E., Furbacher, P., Huang, D. and Smith, J.L. 1994. The cytochrome b6f complex. Curr. Opin. Struct. Biol. 4: 536-544. doi:10.1016/S0959-440X9490216-X. Cramer, W.A., Zhang, H., Yan, J., Kurisu, G. and Smith, J.L. 2004. Evolution of photosynthesis: time-independent structure of the cytochrome b6f complex. Biochemistry 43: 5921-5929. doi:10.1021/bi049444o. PMID 15147175. Schoepp, B., Chabaud, E., Breyton, C., Verméglio, A. and Popot, J.-L. 2000. On the spatial organization of hemes and chlorophyll in cytochrome b6f. A linear and circular dichroism study. J. Biol. Chem. 275: 5275-5283. doi:10.1074/jbc.275.8.5275. PMID 10681499. Stroebel, D., Choquet, Y., Popot, J.-L. and Picot, D. 2003. An atypical haem in the cytochrome b6f complex. Nature 426: 413-418. doi:10.1038/nature02155. PMID 14647374. External links 1Q90 - PDB structure of cytochrome b6f complex from Chlamydomonas reinhardtii 1VF5 - PDB structure of cytochrome b6f complex from Mastigocladus laminosus Cytochrome b6f page @ Purdue University, USA UMich Orientation of Proteins in Membranes families/superfamily-3 - Calculated positions of b6f and related complexes in membranes MeSH Cytochrome+b6f+Complex v d e Enzymes: multienzyme complexes CAD Carbamoyl phosphate synthase II, Aspartate carbamoyltransferase, Dihydroorotase - Cholesterol side-chain cleavage enzyme - Cytochrome b6f complex - Electron transport chain - Fatty acid synthetase complex - Glycine decarboxylase complex - Mitochondrial trifunctional protein HADHA, HADHB - Oxoglutarate dehydrogenase - Phosphoenolpyruvate sugar phosphotransferase system - Photosynthetic reaction center complex proteins - Photosystem - Polyketide synthase - Pyruvate dehydrogenase complex E1, E2, E3 - Sucrase-isomaltase complex -Tryptophan synthase v d e Ion pump: proton pumps ETC ETC Complex I - ETC Complex III - ETC Complex IV Other Bacteriorhodopsin - Cytochrome b6f complex - Inorganic pyrophosphatase - V-ATPase Retrieved from http://en..org/wiki/Cytochrome_b6f_complex Categories: Hemoproteins | Iron-sulfur proteins | Photosynthesis | Integral membrane proteins Views Article Discussion this page History Personal tools Log in / create account Navigation Main page Contents Featured content Current events Random article Search Go Search Interaction Community portal Recent changes Contact Donate to Help Toolbox What links here Related changes Upload file Special pages Printable version Permanent link Cite this page Languages Español This page was last modified on 23 June 2008, at 11:26
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