1swx

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[[Image:1swx.gif|left|200px]]<br /><applet load="1swx" size="350" color="white" frame="true" align="right" spinBox="true"
 
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caption="1swx, resolution 1.65&Aring;" />
 
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'''Crystal structure of a human glycolipid transfer protein in apo-form'''<br />
 
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==Overview==
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==Crystal structure of a human glycolipid transfer protein in apo-form==
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Lipid transfer proteins are important in membrane vesicle biogenesis and trafficking, signal transduction and immunological presentation processes. The conserved and ubiquitous mammalian glycolipid transfer proteins (GLTPs) serve as potential regulators of cell processes mediated by glycosphingolipids, ranging from differentiation and proliferation to invasive adhesion, neurodegeneration and apoptosis. Here we report crystal structures of apo-GLTP (1.65 A resolution) and lactosylceramide-bound (1.95 A) GLTP, in which the bound glycosphingolipid is sandwiched, after adaptive recognition, within a previously unknown two-layer all-alpha-helical topology. Glycosphingolipid binding specificity is achieved through recognition and anchoring of the sugar-amide headgroup to the GLTP recognition centre by hydrogen bond networks and hydrophobic contacts, and encapsulation of both lipid chains, in a precisely oriented manner within a 'moulded-to-fit' hydrophobic tunnel. A cleft-like conformational gating mechanism, involving two interhelical loops and one alpha-helix of GLTP, could enable the glycolipid chains to enter and leave the tunnel in the membrane-associated state. Mutation and functional analyses of residues in the glycolipid recognition centre and within the hydrophobic tunnel support a framework for understanding how GLTPs acquire and release glycosphingolipids during lipid intermembrane transfer and presentation processes.
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<StructureSection load='1swx' size='340' side='right'caption='[[1swx]], [[Resolution|resolution]] 1.65&Aring;' scene=''>
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== Structural highlights ==
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==About this Structure==
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<table><tr><td colspan='2'>[[1swx]] is a 1 chain structure with sequence from [https://en.wikipedia.org/wiki/Homo_sapiens Homo sapiens]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1SWX OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=1SWX FirstGlance]. <br>
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1SWX is a [http://en.wikipedia.org/wiki/Single_protein Single protein] structure of sequence from [http://en.wikipedia.org/wiki/Homo_sapiens Homo sapiens] with <scene name='pdbligand=HEX:'>HEX</scene> as [http://en.wikipedia.org/wiki/ligand ligand]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1SWX 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]] 1.65&#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=HEX:HEXANE'>HEX</scene></td></tr>
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==Reference==
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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=1swx FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=1swx OCA], [https://pdbe.org/1swx PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=1swx RCSB], [https://www.ebi.ac.uk/pdbsum/1swx PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=1swx ProSAT]</span></td></tr>
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Structural basis for glycosphingolipid transfer specificity., Malinina L, Malakhova ML, Teplov A, Brown RE, Patel DJ, Nature. 2004 Aug 26;430(7003):1048-53. PMID:[http://ispc.weizmann.ac.il//pmbin/getpm?pmid=15329726 15329726]
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</table>
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== Function ==
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[https://www.uniprot.org/uniprot/GLTP_HUMAN GLTP_HUMAN] Accelerates the intermembrane transfer of various glycolipids. Catalyzes the transfer of various glycosphingolipids between membranes but does not catalyze the transfer of phospholipids. May be involved in the intracellular translocation of glucosylceramides.<ref>PMID:18261224</ref> <ref>PMID:15504043</ref> <ref>PMID:17980653</ref> <ref>PMID:15329726</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/sw/1swx_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=1swx 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: Homo sapiens]]
[[Category: Homo sapiens]]
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[[Category: Single protein]]
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[[Category: Large Structures]]
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[[Category: Brown, R E.]]
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[[Category: Brown RE]]
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[[Category: Malakhova, M L.]]
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[[Category: Malakhova ML]]
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[[Category: Malinina, L.]]
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[[Category: Malinina L]]
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[[Category: Patel, D J.]]
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[[Category: Patel DJ]]
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[[Category: Teplov, A.]]
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[[Category: Teplov A]]
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[[Category: HEX]]
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[[Category: glycosphingolipid intermembrane transfer protein]]
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''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Thu Feb 21 15:06:15 2008''
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Current revision

Crystal structure of a human glycolipid transfer protein in apo-form

PDB ID 1swx

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