2d2c: Difference between revisions

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{{STRUCTURE_2d2c|  PDB=2d2c  |  SCENE=  }}
==Crystal Structure Of Cytochrome B6F Complex with DBMIB From M. Laminosus==
===Crystal Structure Of Cytochrome B6F Complex with DBMIB From M. Laminosus===
<StructureSection load='2d2c' size='340' side='right' caption='[[2d2c]], [[Resolution|resolution]] 3.80&Aring;' scene=''>
{{ABSTRACT_PUBMED_16371475}}
== Structural highlights ==
<table><tr><td colspan='2'>[[2d2c]] is a 16 chain structure with sequence from [http://en.wikipedia.org/wiki/Mastigocladus_laminosus Mastigocladus laminosus]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=2D2C OCA]. For a <b>guided tour on the structure components</b> use [http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=2D2C FirstGlance]. <br>
</td></tr><tr><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat"><scene name='pdbligand=BCR:BETA-CAROTENE'>BCR</scene>, <scene name='pdbligand=BNT:2,5-DIBROMO-3-ISOPROPYL-6-METHYLBENZO-1,4-QUINONE'>BNT</scene>, <scene name='pdbligand=CLA:CHLOROPHYLL+A'>CLA</scene>, <scene name='pdbligand=FES:FE2/S2+(INORGANIC)+CLUSTER'>FES</scene>, <scene name='pdbligand=HEC:HEME+C'>HEC</scene>, <scene name='pdbligand=HEM:PROTOPORPHYRIN+IX+CONTAINING+FE'>HEM</scene>, <scene name='pdbligand=OPC:(7R,17E)-4-HYDROXY-N,N,N,7-TETRAMETHYL-7-[(8E)-OCTADEC-8-ENOYLOXY]-10-OXO-3,5,9-TRIOXA-4-PHOSPHAHEPTACOS-17-EN-1-AMINIUM+4-OXIDE'>OPC</scene><br>
<tr><td class="sblockLbl"><b>[[Related_structure|Related:]]</b></td><td class="sblockDat">[[1vf5|1vf5]], [[1q90|1q90]], [[2e74|2e74]], [[2e75|2e75]], [[2e76|2e76]], [[2zt9|2zt9]], [[4h44|4h44]], [[4h13|4h13]], [[4h0l|4h0l]], [[4i7z|4i7z]], [[4icj|4icj]], [[4ogq|4ogq]]</td></tr>
<tr><td class="sblockLbl"><b>Activity:</b></td><td class="sblockDat"><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=1.10.9.1 1.10.9.1] </span></td></tr>
<tr><td class="sblockLbl"><b>Resources:</b></td><td class="sblockDat"><span class='plainlinks'>[http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=2d2c FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=2d2c OCA], [http://www.rcsb.org/pdb/explore.do?structureId=2d2c RCSB], [http://www.ebi.ac.uk/pdbsum/2d2c PDBsum]</span></td></tr>
<table>
== Evolutionary Conservation ==
[[Image:Consurf_key_small.gif|200px|right]]
Check<jmol>
  <jmolCheckbox>
    <scriptWhenChecked>select protein; define ~consurf_to_do selected; consurf_initial_scene = true; script "/wiki/ConSurf/d2/2d2c_consurf.spt"</scriptWhenChecked>
    <scriptWhenUnchecked>script /wiki/extensions/Proteopedia/spt/initialview01.spt</scriptWhenUnchecked>
    <text>to colour the structure by Evolutionary Conservation</text>
  </jmolCheckbox>
</jmol>, as determined by [http://consurfdb.tau.ac.il/ ConSurfDB]. You may read the [[Conservation%2C_Evolutionary|explanation]] of the method and the full data available from [http://bental.tau.ac.il/new_ConSurfDB/chain_selection.php?pdb_ID=2ata ConSurf].
<div style="clear:both"></div>
<div style="background-color:#fffaf0;">
== Publication Abstract from PubMed ==
Details are presented of the structural analysis of the cytochrome b(6)f complex from the thermophilic cyanobacterium, Mastigocladus laminosus, in the presence of the electrochemically positive (p)-side quinone analogue inhibitor, 2,5-dibromo-3-methyl-6-isopropylbenzoquinone (DBMIB). One DBMIB binding site was found. This site is peripheral to the quinone binding space defined by the binding sites of other p-side inhibitors previously resolved in cytochrome bc(1)/b(6)f complexes. This high-affinity site resides in a p-side interfacial niche bounded by cytochrome f, subunit IV, and cytochrome b(6), is close (8 A) to the p-side heme b, but distant (19 A) from the [2Fe-2S] cluster. No significant electron density associated with the DBMIB was found elsewhere in the structure. However, the site at which DBMIB can inhibit light-induced redox turnover is within a few A of the [2Fe-2S] cluster, as shown by the absence of inhibition in mutants of Synechococcus sp. PCC 7002 at iron sulfur protein-Leu-111 near the cluster. The ability of a minimum amount of initially oxidized DBMIB to inhibit turnover of WT complex after a second light flash implies that there is a light-activated movement of DBMIB from the distal peripheral site to an inhibitory site proximal to the [2Fe-2S] cluster. Together with the necessary passage of quinone/quinol through the small Q(p) portal in the complex, it is seen that transmembrane traffic of quinone-like molecules through the core of cytochrome bc complexes can be labyrinthine.


==Function==
Intraprotein transfer of the quinone analogue inhibitor 2,5-dibromo-3-methyl-6-isopropyl-p-benzoquinone in the cytochrome b6f complex.,Yan J, Kurisu G, Cramer WA Proc Natl Acad Sci U S A. 2006 Jan 3;103(1):69-74. Epub 2005 Dec 21. PMID:16371475<ref>PMID:16371475</ref>
[[http://www.uniprot.org/uniprot/PETM_MASLA PETM_MASLA]] Component of the cytochrome b6-f complex, which mediates electron transfer between photosystem II (PSII) and photosystem I (PSI), cyclic electron flow around PSI, and state transitions. [[http://www.uniprot.org/uniprot/CYF_MASLA CYF_MASLA]] Component of the cytochrome b6-f complex, which mediates electron transfer between photosystem II (PSII) and photosystem I (PSI), cyclic electron flow around PSI, and state transitions. [[http://www.uniprot.org/uniprot/PETG_MASLA PETG_MASLA]] Component of the cytochrome b6-f complex, which mediates electron transfer between photosystem II (PSII) and photosystem I (PSI), cyclic electron flow around PSI, and state transitions. PetG is required for either the stability or assembly of the cytochrome b6-f complex. [[http://www.uniprot.org/uniprot/PETD_MASLA PETD_MASLA]] Component of the cytochrome b6-f complex, which mediates electron transfer between photosystem II (PSII) and photosystem I (PSI), cyclic electron flow around PSI, and state transitions. [[http://www.uniprot.org/uniprot/PETN_MASLA PETN_MASLA]] Component of the cytochrome b6-f complex, which mediates electron transfer between photosystem II (PSII) and photosystem I (PSI), cyclic electron flow around PSI, and state transitions. [[http://www.uniprot.org/uniprot/CYB6_MASLA CYB6_MASLA]] Component of the cytochrome b6-f complex, which mediates electron transfer between photosystem II (PSII) and photosystem I (PSI), cyclic electron flow around PSI, and state transitions.[HAMAP-Rule:MF_00633] [[http://www.uniprot.org/uniprot/UCRI_MASLA UCRI_MASLA]] Component of the cytochrome b6-f complex, which mediates electron transfer between photosystem II (PSII) and photosystem I (PSI), cyclic electron flow around PSI, and state transitions. [[http://www.uniprot.org/uniprot/PETL_MASLA PETL_MASLA]] Component of the cytochrome b6-f complex, which mediates electron transfer between photosystem II (PSII) and photosystem I (PSI), cyclic electron flow around PSI, and state transitions. PetL is important for photoautotrophic growth as well as for electron transfer efficiency and stability of the cytochrome b6-f complex.


==About this Structure==
From MEDLINE&reg;/PubMed&reg;, a database of the U.S. National Library of Medicine.<br>
[[2d2c]] is a 16 chain structure with sequence from [http://en.wikipedia.org/wiki/Mastigocladus_laminosus Mastigocladus laminosus]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=2D2C OCA].
</div>


==See Also==
==See Also==
*[[Cytochrome f|Cytochrome f]]
*[[Cytochrome f|Cytochrome f]]
 
== References ==
==Reference==
<references/>
<ref group="xtra">PMID:016371475</ref><references group="xtra"/><references/>
__TOC__
</StructureSection>
[[Category: Mastigocladus laminosus]]
[[Category: Mastigocladus laminosus]]
[[Category: Plastoquinol--plastocyanin reductase]]
[[Category: Plastoquinol--plastocyanin reductase]]
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