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==STRUCTURAL COMPARISON OF TWO MAJOR ENDO-1,4-BETA-XYLANASES FROM TRICHODREMA REESEI== | |||
[[Image: | <StructureSection load='1xyn' size='340' side='right' caption='[[1xyn]], [[Resolution|resolution]] 2.00Å' scene=''> | ||
== Structural highlights == | |||
<table><tr><td colspan='2'>[[1xyn]] is a 1 chain structure with sequence from [http://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 [http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=1XYN FirstGlance]. <br> | |||
</td></tr><tr><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat"><scene name='pdbligand=CA:CALCIUM+ION'>CA</scene><br> | |||
<tr><td class="sblockLbl"><b>Activity:</b></td><td class="sblockDat"><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></td></tr> | |||
<tr><td class="sblockLbl"><b>Resources:</b></td><td class="sblockDat"><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.rcsb.org/pdb/explore.do?structureId=1xyn RCSB], [http://www.ebi.ac.uk/pdbsum/1xyn PDBsum]</span></td></tr> | |||
<table> | |||
== Evolutionary Conservation == | |||
[[Image:Consurf_key_small.gif|200px|right]] | |||
Check<jmol> | |||
<jmolCheckbox> | |||
<scriptWhenChecked>select protein; define ~consurf_to_do selected; consurf_initial_scene = true; script "/wiki/ConSurf/xy/1xyn_consurf.spt"</scriptWhenChecked> | |||
<scriptWhenUnchecked>script /wiki/extensions/Proteopedia/spt/initialview01.spt</scriptWhenUnchecked> | |||
<text>to colour the structure by Evolutionary Conservation</text> | |||
</jmolCheckbox> | |||
</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/chain_selection.php?pdb_ID=2ata ConSurf]. | |||
<div style="clear:both"></div> | |||
<div style="background-color:#fffaf0;"> | |||
== Publication Abstract from PubMed == | |||
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. | |||
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:7827044<ref>PMID:7827044</ref> | |||
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.<br> | |||
</div> | |||
== References == | |||
<references/> | |||
__TOC__ | |||
</StructureSection> | |||
== | |||
< | |||
[[Category: Endo-1,4-beta-xylanase]] | [[Category: Endo-1,4-beta-xylanase]] | ||
[[Category: | [[Category: Trichoderma reesei]] | ||
[[Category: Rouvinen, J.]] | [[Category: Rouvinen, J.]] | ||
[[Category: Torronen, A.]] | [[Category: Torronen, A.]] | ||
[[Category: Hydrolase]] | |||
[[Category: Xylanase]] | [[Category: Xylanase]] | ||
Revision as of 01:12, 29 September 2014
STRUCTURAL COMPARISON OF TWO MAJOR ENDO-1,4-BETA-XYLANASES FROM TRICHODREMA REESEISTRUCTURAL COMPARISON OF TWO MAJOR ENDO-1,4-BETA-XYLANASES FROM TRICHODREMA REESEI
Structural highlights
Evolutionary Conservation Check, as determined by ConSurfDB. You may read the explanation of the method and the full data available from ConSurf. Publication Abstract from PubMedThree-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. 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:7827044[1] From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. References |
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