View source for 2uxl


==X-ray high resolution structure of the photosynthetic reaction center from Rb. sphaeroides at pH 10 in the neutral state, 2nd dataset==
<StructureSection load='2uxl' size='340' side='right'caption='[[2uxl]], [[Resolution|resolution]] 2.88&Aring;' scene=''>
== Structural highlights ==
<table><tr><td colspan='2'>[[2uxl]] is a 3 chain structure with sequence from [https://en.wikipedia.org/wiki/Rhodobacter_sphaeroides Rhodobacter sphaeroides]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=2UXL OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=2UXL FirstGlance]. <br>
</td></tr><tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=BCL:BACTERIOCHLOROPHYLL+A'>BCL</scene>, <scene name='pdbligand=BPH:BACTERIOPHEOPHYTIN+A'>BPH</scene>, <scene name='pdbligand=FE:FE+(III)+ION'>FE</scene>, <scene name='pdbligand=GOL:GLYCEROL'>GOL</scene>, <scene name='pdbligand=HTO:HEPTANE-1,2,3-TRIOL'>HTO</scene>, <scene name='pdbligand=LDA:LAURYL+DIMETHYLAMINE-N-OXIDE'>LDA</scene>, <scene name='pdbligand=SPO:SPHEROIDENE'>SPO</scene>, <scene name='pdbligand=U10:UBIQUINONE-10'>U10</scene>, <scene name='pdbligand=UQ2:UBIQUINONE-2'>UQ2</scene></td></tr>
<tr id='related'><td class="sblockLbl"><b>[[Related_structure|Related:]]</b></td><td class="sblockDat"><div style='overflow: auto; max-height: 3em;'>[[1aig|1aig]], [[1aij|1aij]], [[1ds8|1ds8]], [[1dv3|1dv3]], [[1dv6|1dv6]], [[1e14|1e14]], [[1e6d|1e6d]], [[1f6n|1f6n]], [[1fnp|1fnp]], [[1fnq|1fnq]], [[1jgw|1jgw]], [[1jgx|1jgx]], [[1jgy|1jgy]], [[1jgz|1jgz]], [[1jh0|1jh0]], [[1k6l|1k6l]], [[1k6n|1k6n]], [[1kby|1kby]], [[1l9b|1l9b]], [[1l9j|1l9j]], [[1m3x|1m3x]], [[1mps|1mps]], [[1ogv|1ogv]], [[1pcr|1pcr]], [[1pss|1pss]], [[1pst|1pst]], [[1qov|1qov]], [[1rg5|1rg5]], [[1rgn|1rgn]], [[1rqk|1rqk]], [[1rvj|1rvj]], [[1ry5|1ry5]], [[1rzh|1rzh]], [[1rzz|1rzz]], [[1s00|1s00]], [[1umx|1umx]], [[1yst|1yst]], [[1z9j|1z9j]], [[1z9k|1z9k]], [[2bnp|2bnp]], [[2bns|2bns]], [[2boz|2boz]], [[2gmr|2gmr]], [[2j8c|2j8c]], [[2j8d|2j8d]], [[2rcr|2rcr]], [[2uws|2uws]], [[2uwt|2uwt]], [[2uwu|2uwu]], [[2uwv|2uwv]], [[2uww|2uww]], [[2ux3|2ux3]], [[2ux4|2ux4]], [[2ux5|2ux5]], [[4rcr|4rcr]], [[2uxj|2uxj]], [[2uxk|2uxk]], [[2uxm|2uxm]]</div></td></tr>
<tr id='resources'><td class="sblockLbl"><b>Resources:</b></td><td class="sblockDat"><span class='plainlinks'>[https://proteopedia.org/fgij/fg.htm?mol=2uxl FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=2uxl OCA], [https://pdbe.org/2uxl PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=2uxl RCSB], [https://www.ebi.ac.uk/pdbsum/2uxl PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=2uxl ProSAT]</span></td></tr>
</table>
== Function ==
[[https://www.uniprot.org/uniprot/RCEH_RHOSH RCEH_RHOSH]] The reaction center is a membrane-bound complex that mediates the initial photochemical event in the electron transfer process of photosynthesis. [[https://www.uniprot.org/uniprot/RCEM_RHOSH RCEM_RHOSH]] The reaction center is a membrane-bound complex that mediates the initial photochemical event in the electron transfer process of photosynthesis. [[https://www.uniprot.org/uniprot/RCEL_RHOSH RCEL_RHOSH]] The reaction center is a membrane-bound complex that mediates the initial photochemical event in the electron transfer process of photosynthesis. 
== 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/ux/2uxl_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/main_output.php?pdb_ID=2uxl ConSurf].
<div style="clear:both"></div>
<div style="background-color:#fffaf0;">
== Publication Abstract from PubMed ==
The structure of the photosynthetic reaction-center from Rhodobacter sphaeroides has been determined at four different pH values (6.5, 8.0, 9.0, 10.0) in the neutral and in charge separated states. At pH 8.0, in the neutral state, we obtain a resolution of 1.87 A, which is the best ever reported for the bacterial reaction center protein. Our crystallographic data confirm the existence of two different binding positions of the secondary quinone (QB). We observe a new orientation of QB in its distal position, which shows no ring-flip compared to the orientation in the proximal position. Datasets collected for the different pH values show a pH-dependence of the population of the proximal position. The new orientation of QB in the distal position and the pH-dependence could be confirmed by continuum electrostatics calculations. Our calculations are in agreement with the experimentally observed proton uptake upon charge separation. The high resolution of our crystallographic data allows us to identify new water molecules and external residues being involved in two previously described hydrogen bond proton channels. These extended proton-transfer pathways, ending at either of the two oxo-groups of QB in its proximal position, provide additional evidence that ring-flipping is not required for complete protonation of QB upon reduction.

pH modulates the quinone position in the photosynthetic reaction center from Rhodobacter sphaeroides in the neutral and charge separated states.,Koepke J, Krammer EM, Klingen AR, Sebban P, Ullmann GM, Fritzsch G J Mol Biol. 2007 Aug 10;371(2):396-409. Epub 2007 May 10. PMID:17570397<ref>PMID:17570397</ref>

From MEDLINE&reg;/PubMed&reg;, a database of the U.S. National Library of Medicine.<br>
</div>
<div class="pdbe-citations 2uxl" style="background-color:#fffaf0;"></div>
== References ==
<references/>
__TOC__
</StructureSection>
[[Category: Large Structures]]
[[Category: Rhodobacter sphaeroides]]
[[Category: Diehm, R]]
[[Category: Fritzsch, G]]
[[Category: Koepke, J]]
[[Category: Bacteriochlorophyll]]
[[Category: Binding positions of the secondary quinone qb]]
[[Category: Cardiolipin]]
[[Category: Chlorophyll]]
[[Category: Chromophore]]
[[Category: Electron transport]]
[[Category: Iron]]
[[Category: Magnesium]]
[[Category: Membrane]]
[[Category: Metal-binding]]
[[Category: Photosynthesis]]
[[Category: Proton translocation pathway]]
[[Category: Reaction center]]
[[Category: Transmembrane]]
[[Category: Transport]]