6abp

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[[Image:6abp.gif|left|200px]]
 
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==SUGAR-BINDING AND CRYSTALLOGRAPHIC STUDIES OF AN ARABINOSE-BINDING PROTEIN MUTANT (MET108LEU) WHICH EXHIBITS ENHANCED AFFINITY AND ALTERED SPECIFICITY==
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The line below this paragraph, containing "STRUCTURE_6abp", creates the "Structure Box" on the page.
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<StructureSection load='6abp' size='340' side='right'caption='[[6abp]], [[Resolution|resolution]] 1.67&Aring;' scene=''>
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== Structural highlights ==
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or the SCENE parameter (which sets the initial scene displayed when the page is loaded),
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<table><tr><td colspan='2'>[[6abp]] is a 1 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=6ABP OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=6ABP 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]] 1.67&#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=ARA:ALPHA-L-ARABINOSE'>ARA</scene>, <scene name='pdbligand=ARB:BETA-L-ARABINOSE'>ARB</scene></td></tr>
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{{STRUCTURE_6abp| PDB=6abp | SCENE= }}
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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=6abp FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=6abp OCA], [https://pdbe.org/6abp PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=6abp RCSB], [https://www.ebi.ac.uk/pdbsum/6abp PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=6abp ProSAT]</span></td></tr>
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</table>
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'''SUGAR-BINDING AND CRYSTALLOGRAPHIC STUDIES OF AN ARABINOSE-BINDING PROTEIN MUTANT (MET108LEU) WHICH EXHIBITS ENHANCED AFFINITY AND ALTERED SPECIFICITY'''
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== Function ==
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[https://www.uniprot.org/uniprot/ARAF_ECOLI ARAF_ECOLI] Involved in the high-affinity L-arabinose membrane transport system. Binds with high affinity to arabinose, but can also bind D-galactose (approximately 2-fold reduction) and D-fucose (approximately 40-fold reduction).
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== Evolutionary Conservation ==
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==Overview==
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[[Image:Consurf_key_small.gif|200px|right]]
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In addition to hydrogen bonds, van der Waals forces contribute to the affinity of protein-carbohydrate interactions. Nonpolar van der Waals contacts in the complexes of the L-arabinose-binding protein (ABP) with monosaccharides have been studied by means of site-directed mutagenesis, equilibrium and rapid kinetic binding techniques, and X-ray crystallography. ABP, a periplasmic transport receptor of Escherichia coli, binds L-arabinose, D-galactose, and D-fucose with preferential affinity in the order of Ara greater than Gal much greater than Fuc. Well-refined, high-resolution structures of ABP complexed with the three sugars revealed that the structural differences in the ABP-sugar complexes are localized around C5 of the sugars, where the equatorial H of Ara has been substituted for CH3 (Fuc) or CH2OH (Gal). The side chain of Met108 undergoes a sterically dictated, ligand-specific, conformational change to optimize nonpolar interactions between its methyl group and the sugar. We found that the Met108Leu ABP binds Gal tighter than wild-type ABP binds Ara and exhibits a preference for ligand in the order of Gal much greater than Fuc greater than Ara. The differences in affinity can be attributed to differences in the dissociation rates of the ABP-sugar complexes. We have refined at better than 1.7-A resolution the crystal structures of the Met108Leu ABP complexed with each of the sugars and offer a molecular explanation for the altered binding properties.
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Check<jmol>
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<jmolCheckbox>
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==About this Structure==
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<scriptWhenChecked>; select protein; define ~consurf_to_do selected; consurf_initial_scene = true; script "/wiki/ConSurf/ab/6abp_consurf.spt"</scriptWhenChecked>
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6ABP is a [[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=6ABP OCA].
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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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==Reference==
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</jmolCheckbox>
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Sugar-binding and crystallographic studies of an arabinose-binding protein mutant (Met108Leu) that exhibits enhanced affinity and altered specificity., Vermersch PS, Lemon DD, Tesmer JJ, Quiocho FA, Biochemistry. 1991 Jul 16;30(28):6861-6. PMID:[http://www.ncbi.nlm.nih.gov/pubmed/2069949 2069949]
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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=6abp ConSurf].
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<div style="clear:both"></div>
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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: Quiocho, F A.]]
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[[Category: Quiocho FA]]
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[[Category: Tesmer, J J.G.]]
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[[Category: Tesmer JJG]]
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[[Category: Vermersch, P S.]]
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[[Category: Vermersch PS]]
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[[Category: Binding protein]]
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''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Sun May 4 22:38:50 2008''
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Current revision

SUGAR-BINDING AND CRYSTALLOGRAPHIC STUDIES OF AN ARABINOSE-BINDING PROTEIN MUTANT (MET108LEU) WHICH EXHIBITS ENHANCED AFFINITY AND ALTERED SPECIFICITY

PDB ID 6abp

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