1tn0: Difference between revisions

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-[[Image:1tn0.png|left|200px]]
+==Structure of bacterorhodopsin mutant A51P==
+<StructureSection load='1tn0' size='340' side='right' caption='[[1tn0]], [[Resolution|resolution]] 2.50&Aring;' scene=''>
+== Structural highlights ==
+<table><tr><td colspan='2'>[[1tn0]] is a 2 chain structure with sequence from [http://en.wikipedia.org/wiki/Halobacterium_salinarum Halobacterium salinarum]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1TN0 OCA]. For a <b>guided tour on the structure components</b> use [http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=1TN0 FirstGlance]. <br>
+</td></tr><tr><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat"><scene name='pdbligand=RET:RETINAL'>RET</scene><br>
+<tr><td class="sblockLbl"><b>[[Gene|Gene:]]</b></td><td class="sblockDat">BOP, VNG1467G ([http://www.ncbi.nlm.nih.gov/Taxonomy/Browser/wwwtax.cgi?mode=Info&srchmode=5&id=2242 Halobacterium salinarum])</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=1tn0 FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=1tn0 OCA], [http://www.rcsb.org/pdb/explore.do?structureId=1tn0 RCSB], [http://www.ebi.ac.uk/pdbsum/1tn0 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/tn/1tn0_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 ==
+Proline residues are relatively common in transmembrane helices. This suggests that proline substitutions may be readily tolerated in membrane proteins, even though they invariably produce deviations from canonical helical structure. We have experimentally tested this possibility by making proline substitutions at 15 positions throughout the N-terminal half of bacteriorhodopsin helix B. We find that six of the substitutions yielded no active protein and all the others were destabilizing. Three mutations were only slightly destabilizing, however, reducing stability by about 0.5 kcal/mol, and these all occurred close to the N terminus. This result is consistent with the observation that proline is more common near the ends of TM helices. To learn how proline side-chains could be structurally accommodated at different locations in the helix, we solved the structures of a moderately destabilized mutant positioned near the N terminus of the helix, K41P, and a severely destabilized mutant positioned near the middle of the helix, A51P. The K41P mutation produced only local structural alterations, while the A51P mutation resulted in small, but widely distributed structural changes in helix B. Our results indicate that proline is not easily accommodated in transmembrane helices and that the tolerance to proline substitution is dependent, in a complex way, on the position in the structure.
-{{STRUCTURE_1tn0|  PDB=1tn0  |  SCENE=  }}
+Proline substitutions are not easily accommodated in a membrane protein.,Yohannan S, Yang D, Faham S, Boulting G, Whitelegge J, Bowie JU J Mol Biol. 2004 Jul 30;341(1):1-6. PMID:15312757<ref>PMID:15312757</ref>
-===Structure of bacterorhodopsin mutant A51P===
+From MEDLINE&reg;/PubMed&reg;, a database of the U.S. National Library of Medicine.<br>
+</div>
-{{ABSTRACT_PUBMED_15312757}}
-==About this Structure==
-[[1tn0]] is a 2 chain structure with sequence from [http://en.wikipedia.org/wiki/Halobacterium_salinarum Halobacterium salinarum]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1TN0 OCA].
 ==See Also==
 *[[Bacteriorhodopsin|Bacteriorhodopsin]]
+== References ==
-==Reference==
+<references/>
-<ref group="xtra">PMID:015312757</ref><references group="xtra"/>
+__TOC__
+</StructureSection>
 [[Category: Halobacterium salinarum]]
 [[Category: Boulting, G.]]