1q90

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[[Image:1q90.gif|left|200px]]
[[Image:1q90.gif|left|200px]]
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{{Structure
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<!--
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|PDB= 1q90 |SIZE=350|CAPTION= <scene name='initialview01'>1q90</scene>, resolution 3.10&Aring;
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The line below this paragraph, containing "STRUCTURE_1q90", creates the "Structure Box" on the page.
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|SITE=
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You may change the PDB parameter (which sets the PDB file loaded into the applet)
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|LIGAND= <scene name='pdbligand=BCR:BETA-CAROTENE'>BCR</scene>, <scene name='pdbligand=CL1:ALPHA+CHLOROPHYLL+A'>CL1</scene>, <scene name='pdbligand=FES:FE2/S2+(INORGANIC)+CLUSTER'>FES</scene>, <scene name='pdbligand=HEM:PROTOPORPHYRIN+IX+CONTAINING+FE'>HEM</scene>, <scene name='pdbligand=LFA:EICOSANE'>LFA</scene>, <scene name='pdbligand=LMG:1,2-DISTEAROYL-MONOGALACTOSYL-DIGLYCERIDE'>LMG</scene>, <scene name='pdbligand=SQD:1,2-DI-O-ACYL-3-O-[6-DEOXY-6-SULFO-ALPHA-D-GLUCOPYRANOSYL]-SN-GLYCEROL'>SQD</scene>, <scene name='pdbligand=TDS:8-HYDROXY-5,7-DIMETHOXY-3-METHYL-2-TRIDECYL-4H-CHROMEN-4-ONE'>TDS</scene>
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or the SCENE parameter (which sets the initial scene displayed when the page is loaded),
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|ACTIVITY= <span class='plainlinks'>[http://en.wikipedia.org/wiki/Plastoquinol--plastocyanin_reductase Plastoquinol--plastocyanin reductase], with EC number [http://www.brenda-enzymes.info/php/result_flat.php4?ecno=1.10.99.1 1.10.99.1] </span>
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or leave the SCENE parameter empty for the default display.
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|GENE= PETA ([http://www.ncbi.nlm.nih.gov/Taxonomy/Browser/wwwtax.cgi?mode=Info&srchmode=5&id=3055 Chlamydomonas reinhardtii]), PETB ([http://www.ncbi.nlm.nih.gov/Taxonomy/Browser/wwwtax.cgi?mode=Info&srchmode=5&id=3055 Chlamydomonas reinhardtii]), PETC ([http://www.ncbi.nlm.nih.gov/Taxonomy/Browser/wwwtax.cgi?mode=Info&srchmode=5&id=3055 Chlamydomonas reinhardtii]), PETD ([http://www.ncbi.nlm.nih.gov/Taxonomy/Browser/wwwtax.cgi?mode=Info&srchmode=5&id=3055 Chlamydomonas reinhardtii]), PETG ([http://www.ncbi.nlm.nih.gov/Taxonomy/Browser/wwwtax.cgi?mode=Info&srchmode=5&id=3055 Chlamydomonas reinhardtii]), PETL ([http://www.ncbi.nlm.nih.gov/Taxonomy/Browser/wwwtax.cgi?mode=Info&srchmode=5&id=3055 Chlamydomonas reinhardtii]), PETM ([http://www.ncbi.nlm.nih.gov/Taxonomy/Browser/wwwtax.cgi?mode=Info&srchmode=5&id=3055 Chlamydomonas reinhardtii]), PETN ([http://www.ncbi.nlm.nih.gov/Taxonomy/Browser/wwwtax.cgi?mode=Info&srchmode=5&id=3055 Chlamydomonas reinhardtii])
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|DOMAIN=
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{{STRUCTURE_1q90| PDB=1q90 | SCENE= }}
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|RELATEDENTRY=
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|RESOURCES=<span class='plainlinks'>[http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=1q90 FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=1q90 OCA], [http://www.ebi.ac.uk/pdbsum/1q90 PDBsum], [http://www.rcsb.org/pdb/explore.do?structureId=1q90 RCSB]</span>
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}}
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'''Structure of the cytochrome b6f (plastohydroquinone : plastocyanin oxidoreductase) from Chlamydomonas reinhardtii'''
'''Structure of the cytochrome b6f (plastohydroquinone : plastocyanin oxidoreductase) from Chlamydomonas reinhardtii'''
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[[Category: Popot, J L.]]
[[Category: Popot, J L.]]
[[Category: Stroebel, D.]]
[[Category: Stroebel, D.]]
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[[Category: beta-carotene]]
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[[Category: Beta-carotene]]
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[[Category: chlorophyll]]
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[[Category: Chlorophyll]]
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[[Category: electron transfer]]
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[[Category: Electron transfer]]
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[[Category: membrane protein complex]]
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[[Category: Membrane protein complex]]
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[[Category: monogalactosyldiacylglycerol]]
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[[Category: Monogalactosyldiacylglycerol]]
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[[Category: oxydoreductase]]
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[[Category: Oxydoreductase]]
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[[Category: photosynthesis]]
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[[Category: Photosynthesis]]
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[[Category: stigmatellin]]
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[[Category: Stigmatellin]]
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[[Category: sulfoquinovosyldiacylglycerol]]
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[[Category: Sulfoquinovosyldiacylglycerol]]
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''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Sat May 3 06:01:04 2008''
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''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Sun Mar 30 23:10:27 2008''
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Revision as of 03:01, 3 May 2008

Image:1q90.gif

Template:STRUCTURE 1q90

Structure of the cytochrome b6f (plastohydroquinone : plastocyanin oxidoreductase) from Chlamydomonas reinhardtii


Overview

Photosystems I and II (PSI and II) are reaction centres that capture light energy in order to drive oxygenic photosynthesis; however, they can only do so by interacting with the multisubunit cytochrome b(6)f complex. This complex receives electrons from PSII and passes them to PSI, pumping protons across the membrane and powering the Q-cycle. Unlike the mitochondrial and bacterial homologue cytochrome bc(1), cytochrome b(6)f can switch to a cyclic mode of electron transfer around PSI using an unknown pathway. Here we present the X-ray structure at 3.1 A of cytochrome b(6)f from the alga Chlamydomonas reinhardtii. The structure bears similarities to cytochrome bc(1) but also exhibits some unique features, such as binding chlorophyll, beta-carotene and an unexpected haem sharing a quinone site. This haem is atypical as it is covalently bound by one thioether linkage and has no axial amino acid ligand. This haem may be the missing link in oxygenic photosynthesis.

About this Structure

1Q90 is a Protein complex structure of sequences from Chlamydomonas reinhardtii. Full crystallographic information is available from OCA.

Reference

An atypical haem in the cytochrome b(6)f complex., Stroebel D, Choquet Y, Popot JL, Picot D, Nature. 2003 Nov 27;426(6965):413-8. PMID:14647374 Page seeded by OCA on Sat May 3 06:01:04 2008

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