3por

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[[Image:3por.jpg|left|200px]]<br /><applet load="3por" size="350" color="white" frame="true" align="right" spinBox="true"
 
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caption="3por, resolution 2.5&Aring;" />
 
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'''PORIN CONFORMATION IN THE ABSENCE OF CALCIUM; REFINED STRUCTURE AT 2.5 ANGSTROMS RESOLUTION'''<br />
 
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==Overview==
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==PORIN CONFORMATION IN THE ABSENCE OF CALCIUM; REFINED STRUCTURE AT 2.5 ANGSTROMS RESOLUTION==
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The crystal structure of porin from Rhodobacter capsulatus in the absence of divalent calcium ions has been refined to convergence at a resolution of 2.5 A using the simulated annealing refinement method. The final model consists of all 301 amino acid residues, 77 solvent molecules, one tris(hydroxymethyl)-aminomethane molecule and one unknown ligand modeled as n-octyltetraoxyethylene. A superposition with the previously described model containing three calcium ions showed structural changes at the segment 108-116 of the inner loop beta 5-beta 6, and at loops beta 8-beta 9 and beta 11-beta 12 at the extracellular side of the porin molecule. Evidence is presented that the conformational changes depend on the presence or absence of calcium ions. A possible influence on porin function is discussed.
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<StructureSection load='3por' size='340' side='right'caption='[[3por]], [[Resolution|resolution]] 2.50&Aring;' scene=''>
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== Structural highlights ==
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<table><tr><td colspan='2'>[[3por]] is a 1 chain structure with sequence from [https://en.wikipedia.org/wiki/Rhodobacter_capsulatus Rhodobacter capsulatus]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=3POR OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=3POR 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]] 2.5&#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=C8E:(HYDROXYETHYLOXY)TRI(ETHYLOXY)OCTANE'>C8E</scene>, <scene name='pdbligand=TRS:2-AMINO-2-HYDROXYMETHYL-PROPANE-1,3-DIOL'>TRS</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=3por FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=3por OCA], [https://pdbe.org/3por PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=3por RCSB], [https://www.ebi.ac.uk/pdbsum/3por PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=3por ProSAT]</span></td></tr>
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</table>
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== Function ==
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[https://www.uniprot.org/uniprot/PORI_RHOCA PORI_RHOCA] Forms channels that allow the passive diffusion of small hydrophilic solutes up to an exclusion limit of about 0.6 kDa.
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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/po/3por_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=3por ConSurf].
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<div style="clear:both"></div>
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==About this Structure==
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==See Also==
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3POR is a [http://en.wikipedia.org/wiki/Single_protein Single protein] structure of sequence from [http://en.wikipedia.org/wiki/Rhodobacter_capsulatus Rhodobacter capsulatus] with <scene name='pdbligand=C8E:'>C8E</scene> and <scene name='pdbligand=TRS:'>TRS</scene> as [http://en.wikipedia.org/wiki/ligands ligands]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=3POR OCA].
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*[[Cytochrome P450 3D structures|Cytochrome P450 3D structures]]
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*[[Porin 3D structures|Porin 3D structures]]
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==Reference==
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__TOC__
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Porin conformation in the absence of calcium. Refined structure at 2.5 A resolution., Weiss MS, Schulz GE, J Mol Biol. 1993 Jun 5;231(3):817-24. PMID:[http://ispc.weizmann.ac.il//pmbin/getpm?pmid=7685826 7685826]
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</StructureSection>
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[[Category: Large Structures]]
[[Category: Rhodobacter capsulatus]]
[[Category: Rhodobacter capsulatus]]
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[[Category: Single protein]]
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[[Category: Schulz GE]]
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[[Category: Schulz, G E.]]
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[[Category: Weiss MS]]
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[[Category: Weiss, M S.]]
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[[Category: C8E]]
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[[Category: TRS]]
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[[Category: integral membrane protein porin]]
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''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Thu Feb 21 19:10:54 2008''
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Current revision

PORIN CONFORMATION IN THE ABSENCE OF CALCIUM; REFINED STRUCTURE AT 2.5 ANGSTROMS RESOLUTION

PDB ID 3por

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