1qwd

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[[Image:1qwd.gif|left|200px]]<br /><applet load="1qwd" size="350" color="white" frame="true" align="right" spinBox="true"
 
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caption="1qwd, resolution 1.75&Aring;" />
 
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'''CRYSTAL STRUCTURE OF A BACTERIAL LIPOCALIN, THE BLC GENE PRODUCT FROM E. COLI'''<br />
 
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==Overview==
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==CRYSTAL STRUCTURE OF A BACTERIAL LIPOCALIN, THE BLC GENE PRODUCT FROM E. COLI==
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Lipocalins form a large multifunctional family of small proteins (15-25 kDa) first discovered in eukaryotes. More recently, several types of bacterial lipocalins have been reported, among which Blc from Escherichia coli is an outer membrane lipoprotein. As part of our structural genomics effort on proteins from E. coli, we have expressed, crystallized and solved the structure of Blc at 1.8 A resolution using remote SAD with xenon. The structure of Blc, the first of a bacterial lipocalin, exhibits a classical fold formed by a beta-barrel and a alpha-helix similar to that of the moth bilin binding protein. Its empty and open cavity, however, is too narrow to accommodate bilin, while the alkyl chains of two fatty acids or of a phospholipid could be readily modeled inside the cavity. Blc was reported to be expressed under stress conditions such as starvation or high osmolarity, during which the cell envelope suffers and requires maintenance. These data, together with our structural interpretation, suggest a role for Blc in storage or transport of lipids necessary for membrane repair or maintenance.
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<StructureSection load='1qwd' size='340' side='right'caption='[[1qwd]], [[Resolution|resolution]] 1.75&Aring;' scene=''>
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== Structural highlights ==
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==About this Structure==
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<table><tr><td colspan='2'>[[1qwd]] is a 2 chain structure with sequence from [https://en.wikipedia.org/wiki/Escherichia_coli Escherichia coli]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1QWD OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=1QWD FirstGlance]. <br>
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1QWD is a [http://en.wikipedia.org/wiki/Single_protein Single protein] structure of sequence from [http://en.wikipedia.org/wiki/Escherichia_coli Escherichia coli]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1QWD OCA].
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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]] 1.75&#8491;</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=1qwd FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=1qwd OCA], [https://pdbe.org/1qwd PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=1qwd RCSB], [https://www.ebi.ac.uk/pdbsum/1qwd PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=1qwd ProSAT]</span></td></tr>
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==Reference==
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</table>
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The crystal structure of the Escherichia coli lipocalin Blc suggests a possible role in phospholipid binding., Campanacci V, Nurizzo D, Spinelli S, Valencia C, Tegoni M, Cambillau C, FEBS Lett. 2004 Mar 26;562(1-3):183-8. PMID:[http://ispc.weizmann.ac.il//pmbin/getpm?pmid=15044022 15044022]
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== Function ==
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[https://www.uniprot.org/uniprot/BLC_ECOLI BLC_ECOLI] Involved in the storage or transport of lipids necessary for membrane maintenance under stressful conditions. Displays a binding preference for lysophospholipids.<ref>PMID:15044022</ref>
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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/qw/1qwd_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=1qwd ConSurf].
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<div style="clear:both"></div>
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== References ==
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<references/>
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__TOC__
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</StructureSection>
[[Category: Escherichia coli]]
[[Category: Escherichia coli]]
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[[Category: Single protein]]
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[[Category: Large Structures]]
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[[Category: Cambillau, C.]]
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[[Category: Cambillau C]]
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[[Category: Campanacci, V.]]
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[[Category: Campanacci V]]
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[[Category: Nurizzo, D.]]
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[[Category: Nurizzo D]]
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[[Category: Spinelli, S.]]
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[[Category: Spinelli S]]
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[[Category: Valencia, C.]]
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[[Category: Valencia C]]
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[[Category: bacterial lipocalin]]
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''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Thu Feb 21 14:44:30 2008''
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Current revision

CRYSTAL STRUCTURE OF A BACTERIAL LIPOCALIN, THE BLC GENE PRODUCT FROM E. COLI

PDB ID 1qwd

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