2gmr
From Proteopedia
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(New page: 200px<br /><applet load="2gmr" size="450" color="white" frame="true" align="right" spinBox="true" caption="2gmr, resolution 2.50Å" /> '''Photosynthetic react...) |
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| - | [[Image:2gmr.gif|left|200px]]<br /><applet load="2gmr" size="450" color="white" frame="true" align="right" spinBox="true" | ||
| - | caption="2gmr, resolution 2.50Å" /> | ||
| - | '''Photosynthetic reaction center mutant from Rhodobacter sphaeroides with Asp L210 replaced with Asn'''<br /> | ||
| - | == | + | ==Photosynthetic reaction center mutant from Rhodobacter sphaeroides with Asp L210 replaced with Asn== |
| - | The reaction center (RC) of Rhodobacter sphaeroides uses light energy to | + | <StructureSection load='2gmr' size='340' side='right'caption='[[2gmr]], [[Resolution|resolution]] 2.50Å' scene=''> |
| + | == Structural highlights == | ||
| + | <table><tr><td colspan='2'>[[2gmr]] is a 3 chain structure with sequence from [https://en.wikipedia.org/wiki/Cereibacter_sphaeroides Cereibacter sphaeroides]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=2GMR OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=2GMR FirstGlance]. <br> | ||
| + | </td></tr><tr id='method'><td class="sblockLbl"><b>[[Empirical_models|Method:]]</b></td><td class="sblockDat" id="methodDat">X-ray diffraction, [[Resolution|Resolution]] 2.5Å</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=FE2:FE+(II)+ION'>FE2</scene>, <scene name='pdbligand=LDA:LAURYL+DIMETHYLAMINE-N-OXIDE'>LDA</scene>, <scene name='pdbligand=SPN:SPEROIDENONE'>SPN</scene>, <scene name='pdbligand=U10:UBIQUINONE-10'>U10</scene></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=2gmr FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=2gmr OCA], [https://pdbe.org/2gmr PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=2gmr RCSB], [https://www.ebi.ac.uk/pdbsum/2gmr PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=2gmr ProSAT]</span></td></tr> | ||
| + | </table> | ||
| + | == Function == | ||
| + | [https://www.uniprot.org/uniprot/RCEL_CERSP RCEL_CERSP] 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/gm/2gmr_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=2gmr ConSurf]. | ||
| + | <div style="clear:both"></div> | ||
| + | <div style="background-color:#fffaf0;"> | ||
| + | == Publication Abstract from PubMed == | ||
| + | The reaction center (RC) of Rhodobacter sphaeroides uses light energy to reduce and protonate a quinone molecule, QB (the secondary quinone electron acceptor), to form quinol, QBH2. Asp210 in the L-subunit has been shown to be a catalytic residue in this process. Mutation of Asp210 to Asn leads to a deceleration of reoxidation of QA- in the QA-QB --> QAQB- transition. Here we determined the structure of the Asp210 to Asn mutant to 2.5 A and show that there are no major structural differences as compared to the wild-type protein. We found QB in the distal position and a chain of water molecules between Asn210 and QB. Using time-resolved Fourier transform infrared (trFTIR) spectroscopy, we characterized the molecular reaction mechanism of this mutant. We found that QB- formation precedes QA- oxidation even more pronounced than in the wild-type reaction center. Continuum absorbance changes indicate deprotonation of a protonated water cluster, most likely of the water chain between Asn210 and QB. A detailed analysis of wild-type structures revealed a highly conserved water chain between Asp210 or Glu210 and QB in Rb. sphaeroides and Rhodopseudomonas viridis, respectively. | ||
| - | + | Proton uptake in the reaction center mutant L210DN from Rhodobacter sphaeroides via protonated water molecules.,Hermes S, Stachnik JM, Onidas D, Remy A, Hofmann E, Gerwert K Biochemistry. 2006 Nov 21;45(46):13741-9. PMID:17105193<ref>PMID:17105193</ref> | |
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| - | + | From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.<br> | |
| - | + | </div> | |
| - | [[Category: | + | <div class="pdbe-citations 2gmr" style="background-color:#fffaf0;"></div> |
| - | [[Category: | + | == References == |
| - | [[Category: Gerwert | + | <references/> |
| - | [[Category: Hermes | + | __TOC__ |
| - | [[Category: Hofmann | + | </StructureSection> |
| - | [[Category: Stachnik | + | [[Category: Cereibacter sphaeroides]] |
| - | + | [[Category: Large Structures]] | |
| - | + | [[Category: Gerwert K]] | |
| - | + | [[Category: Hermes S]] | |
| - | + | [[Category: Hofmann E]] | |
| - | + | [[Category: Stachnik JM]] | |
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Current revision
Photosynthetic reaction center mutant from Rhodobacter sphaeroides with Asp L210 replaced with Asn
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