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1bcx

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[[Image:1bcx.jpg|left|200px]]
 
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{{Structure
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==MUTATIONAL AND CRYSTALLOGRAPHIC ANALYSES OF THE ACTIVE SITE RESIDUES OF THE BACILLUS CIRCULANS XYLANASE==
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|PDB= 1bcx |SIZE=350|CAPTION= <scene name='initialview01'>1bcx</scene>, resolution 1.81&Aring;
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<StructureSection load='1bcx' size='340' side='right'caption='[[1bcx]], [[Resolution|resolution]] 1.81&Aring;' scene=''>
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|SITE=
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== Structural highlights ==
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|LIGAND= <scene name='pdbligand=SO4:SULFATE ION'>SO4</scene>
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<table><tr><td colspan='2'>[[1bcx]] is a 1 chain structure with sequence from [https://en.wikipedia.org/wiki/Niallia_circulans Niallia circulans]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1BCX OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=1BCX FirstGlance]. <br>
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|ACTIVITY= [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]
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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]] 1.81&#8491;</td></tr>
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|GENE=
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<tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=PRD_900116:4beta-beta-xylobiose'>PRD_900116</scene>, <scene name='pdbligand=SO4:SULFATE+ION'>SO4</scene>, <scene name='pdbligand=XYP:BETA-D-XYLOPYRANOSE'>XYP</scene></td></tr>
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}}
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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=1bcx FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=1bcx OCA], [https://pdbe.org/1bcx PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=1bcx RCSB], [https://www.ebi.ac.uk/pdbsum/1bcx PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=1bcx ProSAT]</span></td></tr>
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</table>
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'''MUTATIONAL AND CRYSTALLOGRAPHIC ANALYSES OF THE ACTIVE SITE RESIDUES OF THE BACILLUS CIRCULANS XYLANASE'''
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== Function ==
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[https://www.uniprot.org/uniprot/XYNA_NIACI XYNA_NIACI]
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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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Using site-directed mutagenesis we have investigated the catalytic residues in a xylanase from Bacillus circulans. Analysis of the mutants E78D and E172D indicated that mutations in these conserved residues do not grossly alter the structure of the enzyme and that these residues participate in the catalytic mechanism. We have now determined the crystal structure of an enzyme-substrate complex to 108 A resolution using a catalytically incompetent mutant (E172C). In addition to the catalytic residues, Glu 78 and Glu 172, we have identified 2 tyrosine residues, Tyr 69 and Tyr 80, which likely function in substrate binding, and an arginine residue, Arg 112, which plays an important role in the active site of this enzyme. On the basis of our work we would propose that Glu 78 is the nucleophile and that Glu 172 is the acid-base catalyst in the reaction.
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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/bc/1bcx_consurf.spt"</scriptWhenChecked>
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1BCX is a [[Single protein]] structure of sequence from [http://en.wikipedia.org/wiki/Bacillus_circulans Bacillus circulans]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1BCX 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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Mutational and crystallographic analyses of the active site residues of the Bacillus circulans xylanase., Wakarchuk WW, Campbell RL, Sung WL, Davoodi J, Yaguchi M, Protein Sci. 1994 Mar;3(3):467-75. PMID:[http://www.ncbi.nlm.nih.gov/pubmed/8019418 8019418]
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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=1bcx ConSurf].
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[[Category: Bacillus circulans]]
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<div style="clear:both"></div>
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[[Category: Endo-1,4-beta-xylanase]]
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__TOC__
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[[Category: Single protein]]
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</StructureSection>
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[[Category: Campbell, R L.]]
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[[Category: Large Structures]]
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[[Category: Wakarchuk, W W.]]
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[[Category: Niallia circulans]]
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[[Category: SO4]]
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[[Category: Campbell RL]]
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[[Category: hydrolase(xylan degradation)]]
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[[Category: Wakarchuk WW]]
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''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Thu Mar 20 10:09:19 2008''
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Current revision

MUTATIONAL AND CRYSTALLOGRAPHIC ANALYSES OF THE ACTIVE SITE RESIDUES OF THE BACILLUS CIRCULANS XYLANASE

PDB ID 1bcx

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