1qko

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[[Image:1qko.jpg|left|200px]]<br /><applet load="1qko" size="450" color="white" frame="true" align="right" spinBox="true"
 
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caption="1qko, resolution 2.10&Aring;" />
 
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'''HIGH RESOLUTION X-RAY STRUCTURE OF AN EARLY INTERMEDIATE IN THE BACTERIORHODOPSIN PHOTOCYCLE'''<br />
 
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==Overview==
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==HIGH RESOLUTION X-RAY STRUCTURE OF AN EARLY INTERMEDIATE IN THE BACTERIORHODOPSIN PHOTOCYCLE==
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Bacteriorhodopsin is the simplest known photon-driven proton pump and as, such provides a model for the study of a basic function in bioenergetics., Its seven transmembrane helices encompass a proton translocation pathway, containing the chromophore, a retinal molecule covalently bound to lysine, 216 through a protonated Schiff base, and a series of proton donors and, acceptors. Photoisomerization of the all-trans retinal to the 13-cis, configuration initiates the vectorial translocation of a proton from the, Schiff base, the primary proton donor, to the extracellular side, followed, by reprotonation of the Schiff base from the cytoplasm. Here we describe, the high-resolution X-ray structure of an early intermediate in the, photocycle of bacteriorhodopsin, which is formed directly after, photoexcitation. A key water molecule is dislocated, allowing the primary, proton acceptor, Asp 85, to move. Movement of the main-chain Lys 216, locally disrupts the hydrogen-bonding network of helix G, facilitating, structural changes later in the photocycle.
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<StructureSection load='1qko' size='340' side='right'caption='[[1qko]], [[Resolution|resolution]] 2.10&Aring;' scene=''>
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== Structural highlights ==
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<table><tr><td colspan='2'>[[1qko]] is a 1 chain structure with sequence from [https://en.wikipedia.org/wiki/Halobacterium_salinarum Halobacterium salinarum]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1QKO OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=1QKO FirstGlance]. <br>
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</td></tr><tr id='method'><td class="sblockLbl"><b>[[Empirical_models|Method:]]</b></td><td class="sblockDat" id="methodDat">X-ray diffraction, [[Resolution|Resolution]] 2.1&#8491;</td></tr>
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<tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=RET:RETINAL'>RET</scene></td></tr>
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<tr id='resources'><td class="sblockLbl"><b>Resources:</b></td><td class="sblockDat"><span class='plainlinks'>[https://proteopedia.org/fgij/fg.htm?mol=1qko FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=1qko OCA], [https://pdbe.org/1qko PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=1qko RCSB], [https://www.ebi.ac.uk/pdbsum/1qko PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=1qko ProSAT]</span></td></tr>
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</table>
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== Function ==
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[https://www.uniprot.org/uniprot/BACR_HALSA BACR_HALSA] Light-driven proton pump.
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== Evolutionary Conservation ==
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[[Image:Consurf_key_small.gif|200px|right]]
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Check<jmol>
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<jmolCheckbox>
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<scriptWhenChecked>; select protein; define ~consurf_to_do selected; consurf_initial_scene = true; script "/wiki/ConSurf/qk/1qko_consurf.spt"</scriptWhenChecked>
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<scriptWhenUnchecked>script /wiki/extensions/Proteopedia/spt/initialview01.spt</scriptWhenUnchecked>
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<text>to colour the structure by Evolutionary Conservation</text>
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</jmolCheckbox>
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</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=1qko ConSurf].
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<div style="clear:both"></div>
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<div style="background-color:#fffaf0;">
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== Publication Abstract from PubMed ==
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Bacteriorhodopsin is the simplest known photon-driven proton pump and as such provides a model for the study of a basic function in bioenergetics. Its seven transmembrane helices encompass a proton translocation pathway containing the chromophore, a retinal molecule covalently bound to lysine 216 through a protonated Schiff base, and a series of proton donors and acceptors. Photoisomerization of the all-trans retinal to the 13-cis configuration initiates the vectorial translocation of a proton from the Schiff base, the primary proton donor, to the extracellular side, followed by reprotonation of the Schiff base from the cytoplasm. Here we describe the high-resolution X-ray structure of an early intermediate in the photocycle of bacteriorhodopsin, which is formed directly after photoexcitation. A key water molecule is dislocated, allowing the primary proton acceptor, Asp 85, to move. Movement of the main-chain Lys 216 locally disrupts the hydrogen-bonding network of helix G, facilitating structural changes later in the photocycle.
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==About this Structure==
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High-resolution X-ray structure of an early intermediate in the bacteriorhodopsin photocycle.,Edman K, Nollert P, Royant A, Belrhali H, Pebay-Peyroula E, Hajdu J, Neutze R, Landau EM Nature. 1999 Oct 21;401(6755):822-6. PMID:10548112<ref>PMID:10548112</ref>
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1QKO is a [http://en.wikipedia.org/wiki/Single_protein Single protein] structure of sequence from [http://en.wikipedia.org/wiki/Halobacterium_salinarum Halobacterium salinarum] with RET as [http://en.wikipedia.org/wiki/ligand ligand]. Known structural/functional Site: <scene name='pdbsite=SFF:Schiff Base'>SFF</scene>. Full crystallographic information is available from [http://ispc.weizmann.ac.il/oca-bin/ocashort?id=1QKO OCA].
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==Reference==
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From MEDLINE&reg;/PubMed&reg;, a database of the U.S. National Library of Medicine.<br>
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High-resolution X-ray structure of an early intermediate in the bacteriorhodopsin photocycle., Edman K, Nollert P, Royant A, Belrhali H, Pebay-Peyroula E, Hajdu J, Neutze R, Landau EM, Nature. 1999 Oct 21;401(6755):822-6. PMID:[http://ispc.weizmann.ac.il//pmbin/getpm?pmid=10548112 10548112]
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</div>
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[[Category: Halobacterium salinarum]]
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<div class="pdbe-citations 1qko" style="background-color:#fffaf0;"></div>
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[[Category: Single protein]]
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[[Category: Belrhali, H.]]
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[[Category: Edman, K.]]
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[[Category: Hajdu, J.]]
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[[Category: Landau, E.M.]]
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[[Category: Neutze, R.]]
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[[Category: Nollert, P.]]
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[[Category: Pebay-Peyroula, E.]]
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[[Category: Royant, A.]]
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[[Category: RET]]
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[[Category: intermediate state]]
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[[Category: lipidic cubic phases]]
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[[Category: membrane protein]]
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[[Category: photocycle]]
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[[Category: photoreceptor]]
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[[Category: proton pump]]
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[[Category: retinal protein]]
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''Page seeded by [http://ispc.weizmann.ac.il/oca OCA ] on Tue Dec 18 17:55:06 2007''
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==See Also==
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*[[Bacteriorhodopsin 3D structures|Bacteriorhodopsin 3D structures]]
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== References ==
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<references/>
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__TOC__
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</StructureSection>
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[[Category: Halobacterium salinarum]]
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[[Category: Large Structures]]
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[[Category: Belrhali H]]
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[[Category: Edman K]]
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[[Category: Hajdu J]]
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[[Category: Landau EM]]
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[[Category: Neutze R]]
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[[Category: Nollert P]]
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[[Category: Pebay-Peyroula E]]
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[[Category: Royant A]]

Current revision

HIGH RESOLUTION X-RAY STRUCTURE OF AN EARLY INTERMEDIATE IN THE BACTERIORHODOPSIN PHOTOCYCLE

PDB ID 1qko

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