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1e5b

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[[Image:1e5b.gif|left|200px]]<br />
 
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<applet load="1e5b" size="450" color="white" frame="true" align="right" spinBox="true"
 
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caption="1e5b" />
 
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'''INTERNAL XYLAN BINDING DOMAIN FROM C. FIMI XYN10A, R262G MUTANT'''<br />
 
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==Overview==
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==Internal xylan binding domain from C. fimi Xyn10A, R262G mutant==
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The interactions of proteins with polysaccharides play a key role in the, microbial hydrolysis of cellulose and xylan, the most abundant organic, molecules in the biosphere, and are thus pivotal to the recycling of, photosynthetically fixed carbon. Enzymes that attack these recalcitrant, polymers have a modular structure comprising catalytic modules and, non-catalytic carbohydrate-binding modules (CBMs). The largest prokaryotic, CBM family, CBM2, contains members that bind cellulose (CBM2a) and xylan, (CBM2b), respectively. A possible explanation for the different ligand, specificity of CBM2b is that one of the surface tryptophans involved in, the protein-carbohydrate interaction is rotated by 90 degrees compared, with its position in CBM2a (thus matching the structure of the binding, site to the helical secondary structure of xylan), which may be promoted, by a single amino acid difference between the two families. Here we show, that by mutation of this single residue (Arg-262--&gt;Gly), a CBM2b, xylan-binding module completely loses its affinity for xylan and becomes a, cellulose-binding module. The structural effect of the mutation has been, revealed using NMR spectroscopy, which confirms that Trp-259 rotates 90, degrees to lie flat against the protein surface. Except for this one, residue, the mutation only results in minor changes to the structure. The, mutated protein interacts with cellulose using the same residues that the, wild-type CBM2b uses to interact with xylan, suggesting that the, recognition is of the secondary structure of the polysaccharide rather, than any specific recognition of the absence or presence of functional, groups.
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<StructureSection load='1e5b' size='340' side='right'caption='[[1e5b]]' scene=''>
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== Structural highlights ==
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==About this Structure==
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<table><tr><td colspan='2'>[[1e5b]] is a 1 chain structure with sequence from [https://en.wikipedia.org/wiki/Cellulomonas_fimi Cellulomonas fimi]. Full experimental information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1E5B OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=1E5B FirstGlance]. <br>
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1E5B is a [http://en.wikipedia.org/wiki/Single_protein Single protein] structure of sequence from [http://en.wikipedia.org/wiki/Cellulomonas_fimi Cellulomonas fimi]. Active as [http://en.wikipedia.org/wiki/Endo-1,4-beta-xylanase Endo-1,4-beta-xylanase], with EC number [http://www.brenda-enzymes.info/php/result_flat.php4?ecno=3.2.1.8 3.2.1.8] Structure known Active Site: XBD. Full crystallographic information is available from [http://ispc.weizmann.ac.il/oca-bin/ocashort?id=1E5B OCA].
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</td></tr><tr id='method'><td class="sblockLbl"><b>[[Empirical_models|Method:]]</b></td><td class="sblockDat" id="methodDat">Solution NMR</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=1e5b FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=1e5b OCA], [https://pdbe.org/1e5b PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=1e5b RCSB], [https://www.ebi.ac.uk/pdbsum/1e5b PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=1e5b ProSAT]</span></td></tr>
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==Reference==
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</table>
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The structural basis for the ligand specificity of family 2 carbohydrate-binding modules., Simpson PJ, Xie H, Bolam DN, Gilbert HJ, Williamson MP, J Biol Chem. 2000 Dec 29;275(52):41137-42. PMID:[http://ispc.weizmann.ac.il//pmbin/getpm?pmid=10973978 10973978]
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== Function ==
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[https://www.uniprot.org/uniprot/XYND_CELFI XYND_CELFI] Endo-acting xylanase which displays no detectable activity against polysaccharides other than xylan. Hydrolyzes glucosidic bonds with retention of anomeric configuration.
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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/e5/1e5b_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=1e5b ConSurf].
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<div style="clear:both"></div>
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__TOC__
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</StructureSection>
[[Category: Cellulomonas fimi]]
[[Category: Cellulomonas fimi]]
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[[Category: Endo-1,4-beta-xylanase]]
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[[Category: Large Structures]]
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[[Category: Single protein]]
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[[Category: Bolam DN]]
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[[Category: Bolam, D.N.]]
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[[Category: Gilbert HJ]]
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[[Category: Gilbert, H.J.]]
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[[Category: Hefang X]]
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[[Category: Hefang, X.]]
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[[Category: Simpson PJ]]
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[[Category: Simpson, P.J.]]
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[[Category: Williamson MP]]
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[[Category: Williamson, M.P.]]
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[[Category: beta-sheet]]
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[[Category: hydrolase]]
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[[Category: xylan binding domain]]
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[[Category: xylanase]]
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''Page seeded by [http://ispc.weizmann.ac.il/oca OCA ] on Mon Nov 5 12:49:19 2007''
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Current revision

Internal xylan binding domain from C. fimi Xyn10A, R262G mutant

PDB ID 1e5b

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