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1xyn

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[[Image:1xyn.gif|left|200px]]
 
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{{Structure
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==STRUCTURAL COMPARISON OF TWO MAJOR ENDO-1,4-BETA-XYLANASES FROM TRICHODREMA REESEI==
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|PDB= 1xyn |SIZE=350|CAPTION= <scene name='initialview01'>1xyn</scene>, resolution 2.0&Aring;
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<StructureSection load='1xyn' size='340' side='right'caption='[[1xyn]], [[Resolution|resolution]] 2.00&Aring;' scene=''>
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|SITE=
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== Structural highlights ==
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|LIGAND= <scene name='pdbligand=CA:CALCIUM+ION'>CA</scene>
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<table><tr><td colspan='2'>[[1xyn]] is a 1 chain structure with sequence from [https://en.wikipedia.org/wiki/Trichoderma_reesei Trichoderma reesei]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1XYN OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=1XYN FirstGlance]. <br>
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|ACTIVITY= <span class='plainlinks'>[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] </span>
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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]] 2&#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=CA:CALCIUM+ION'>CA</scene></td></tr>
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|DOMAIN=
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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=1xyn FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=1xyn OCA], [https://pdbe.org/1xyn PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=1xyn RCSB], [https://www.ebi.ac.uk/pdbsum/1xyn PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=1xyn ProSAT]</span></td></tr>
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|RELATEDENTRY=
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</table>
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|RESOURCES=<span class='plainlinks'>[http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=1xyn FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=1xyn OCA], [http://www.ebi.ac.uk/pdbsum/1xyn PDBsum], [http://www.rcsb.org/pdb/explore.do?structureId=1xyn RCSB]</span>
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== Function ==
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}}
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[https://www.uniprot.org/uniprot/XYN1_HYPJR XYN1_HYPJR] Glycoside hydrolase involved in the hydrolysis of xylan, a major plant cell wall hemicellulose made up of 1,4-beta-linked D-xylopyranose residues. Catalyzes the endohydrolysis of the main-chain 1,4-beta-glycosidic bonds connecting the xylose subunits yielding various xylooligosaccharides and xylose (PubMed:1369024, Ref.3). The catalysis proceeds by a double-displacement reaction mechanism with a putative covalent glycosyl-enzyme intermediate, with retention of the anomeric configuration (PubMed:7988708).<ref>PMID:1369024</ref> <ref>PMID:7988708</ref> [REFERENCE:3]
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== Evolutionary Conservation ==
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'''STRUCTURAL COMPARISON OF TWO MAJOR ENDO-1,4-BETA-XYLANASES FROM TRICHODREMA REESEI'''
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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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==Overview==
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<scriptWhenChecked>; select protein; define ~consurf_to_do selected; consurf_initial_scene = true; script "/wiki/ConSurf/xy/1xyn_consurf.spt"</scriptWhenChecked>
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Three-dimensional structures of two major endo-1,4-xylanases, XYNI and XYNII from Trichoderma reesei, have been determined by X-ray crystallography. The amino acid sequences of both enzymes are highly homologous (identity approximately 50%), and both XYNI and XYNII exist as a single domain that contains two mostly antiparallel beta-sheets which are packed against each other. The beta-sheet structure is twisted, forming a cleft where the active site is situated. Two glutamic acids in the cleft, Glu75 and Glu164 in XYNI as well as Glu86 and Glu177 in XYNII, are most likely involved in catalysis. Inspection of the structures reveals that the width of the active site cleft and the number of subsites are different in XYNI and XYNII. The active site is narrower in XYNI and probably contains only three subsites, whereas the number of subsites in XYNII is most likely five. Variations in the surroundings of catalytic residue Glu164XYNI/Glu177XYNII are thought to explain the pH optimum differences observed in XYNI and XYNII.
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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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==About this Structure==
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</jmolCheckbox>
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1XYN is a [[Single protein]] structure of sequence from [http://en.wikipedia.org/wiki/Hypocrea_jecorina Hypocrea jecorina]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1XYN OCA].
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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=1xyn ConSurf].
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<div style="clear:both"></div>
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==Reference==
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== References ==
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Structural comparison of two major endo-1,4-xylanases from Trichoderma reesei., Torronen A, Rouvinen J, Biochemistry. 1995 Jan 24;34(3):847-56. PMID:[http://www.ncbi.nlm.nih.gov/pubmed/7827044 7827044]
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<references/>
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[[Category: Endo-1,4-beta-xylanase]]
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__TOC__
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[[Category: Hypocrea jecorina]]
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</StructureSection>
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[[Category: Single protein]]
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[[Category: Large Structures]]
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[[Category: Rouvinen, J.]]
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[[Category: Trichoderma reesei]]
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[[Category: Torronen, A.]]
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[[Category: Rouvinen J]]
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[[Category: xylanase]]
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[[Category: Torronen A]]
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''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Mon Mar 31 00:56:28 2008''
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Current revision

STRUCTURAL COMPARISON OF TWO MAJOR ENDO-1,4-BETA-XYLANASES FROM TRICHODREMA REESEI

PDB ID 1xyn

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