1vlq
From Proteopedia
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| - | [[Image:1vlq.gif|left|200px]]<br /><applet load="1vlq" size="350" color="white" frame="true" align="right" spinBox="true" | ||
| - | caption="1vlq, resolution 2.10Å" /> | ||
| - | '''Crystal structure of Acetyl xylan esterase (TM0077) from Thermotoga maritima at 2.10 A resolution'''<br /> | ||
| - | == | + | ==Crystal structure of Acetyl xylan esterase (TM0077) from Thermotoga maritima at 2.10 A resolution== |
| - | + | <StructureSection load='1vlq' size='340' side='right'caption='[[1vlq]], [[Resolution|resolution]] 2.10Å' scene=''> | |
| - | + | == Structural highlights == | |
| - | [ | + | <table><tr><td colspan='2'>[[1vlq]] is a 12 chain structure with sequence from [https://en.wikipedia.org/wiki/Thermotoga_maritima_MSB8 Thermotoga maritima MSB8]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1VLQ OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=1VLQ FirstGlance]. <br> |
| - | + | </td></tr><tr id='method'><td class="sblockLbl"><b>[[Empirical_models|Method:]]</b></td><td class="sblockDat" id="methodDat">X-ray diffraction, [[Resolution|Resolution]] 2.1Å</td></tr> | |
| - | [ | + | <tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=GOL:GLYCEROL'>GOL</scene>, <scene name='pdbligand=MSE:SELENOMETHIONINE'>MSE</scene></td></tr> |
| - | [ | + | <tr id='resources'><td class="sblockLbl"><b>Resources:</b></td><td class="sblockDat"><span class='plainlinks'>[https://proteopedia.org/fgij/fg.htm?mol=1vlq FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=1vlq OCA], [https://pdbe.org/1vlq PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=1vlq RCSB], [https://www.ebi.ac.uk/pdbsum/1vlq PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=1vlq ProSAT], [https://www.topsan.org/Proteins/JCSG/1vlq TOPSAN]</span></td></tr> |
| - | [ | + | </table> |
| - | + | == Function == | |
| - | [[ | + | [https://www.uniprot.org/uniprot/CAH_THEMA CAH_THEMA] Esterase that removes acetyl groups from a number of O-acetylated small substrates, such as acetylated xylose, short xylo-oligosaccharides and cephalosporin C. Has no activity towards polymeric acetylated xylan, 4-methylumbelliferyl acetate or alpha-naphthyl acetate. Able to catalyze rapid hydrolysis of a range of substrates preferably with acetate groups, independent of the alcohol moiety. Exhibits a narrow selectivity for short chain acyl esters (C2-C3). Displays broad substrate specificity by hydrolyzing acetate at 2, 3, and 4 positions of 4-nitrophenyl-beta-D-xylopyranoside (pNP-Xyl) with similar efficiency. Cannot cleave amide linkages.<ref>PMID:21255309</ref> <ref>PMID:22411095</ref> <ref>PMID:22659119</ref> |
| - | + | == 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/vl/1vlq_consurf.spt"</scriptWhenChecked> | ||
| + | <scriptWhenUnchecked>script /wiki/extensions/Proteopedia/spt/initialview03.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/main_output.php?pdb_ID=1vlq ConSurf]. | ||
| + | <div style="clear:both"></div> | ||
| + | <div style="background-color:#fffaf0;"> | ||
| + | == Publication Abstract from PubMed == | ||
| + | TM0077 from Thermotoga maritima is a member of the carbohydrate esterase family 7 and is active on a variety of acetylated compounds, including cephalosporin C. TM0077 esterase activity is confined to short-chain acyl esters (C2-C3), and is optimal around 100 degrees C and pH 7.5. The positional specificity of TM0077 was investigated using 4-nitrophenyl-beta-D-xylopyranoside monoacetates as substrates in a beta-xylosidase-coupled assay. TM0077 hydrolyzes acetate at positions 2, 3, and 4 with equal efficiency. No activity was detected on xylan or acetylated xylan, which implies that TM0077 is an acetyl esterase and not an acetyl xylan esterase as currently annotated. Selenomethionine-substituted and native structures of TM0077 were determined at 2.1 and 2.5 A resolution, respectively, revealing a classic alpha/beta-hydrolase fold. TM0077 assembles into a doughnut-shaped hexamer with small tunnels on either side leading to an inner cavity, which contains the six catalytic centers. Structures of TM0077 with covalently bound phenylmethylsulfonyl fluoride and paraoxon were determined to 2.4 and 2.1 A, respectively, and confirmed that both inhibitors bind covalently to the catalytic serine (Ser188). Upon binding of inhibitor, the catalytic serine adopts an altered conformation, as observed in other esterase and lipases, and supports a previously proposed catalytic mechanism in which Ser hydroxyl rotation prevents reversal of the reaction and allows access of a water molecule for completion of the reaction. Proteins 2012. (c) 2012 Wiley Periodicals, Inc. | ||
| - | + | Functional and structural characterization of a thermostable acetyl esterase from Thermotoga maritima.,Levisson M, Han GW, Deller MC, Xu Q, Biely P, Hendriks S, Ten Eyck LF, Flensburg C, Roversi P, Miller MD, McMullan D, von Delft F, Kreusch A, Deacon AM, van der Oost J, Lesley SA, Elsliger MA, Kengen SW, Wilson IA Proteins. 2012 Jan 27. doi: 10.1002/prot.24041. PMID:22411095<ref>PMID:22411095</ref> | |
| + | |||
| + | From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.<br> | ||
| + | </div> | ||
| + | <div class="pdbe-citations 1vlq" style="background-color:#fffaf0;"></div> | ||
| + | |||
| + | ==See Also== | ||
| + | *[[Acetylxylan esterase 3D structures|Acetylxylan esterase 3D structures]] | ||
| + | == References == | ||
| + | <references/> | ||
| + | __TOC__ | ||
| + | </StructureSection> | ||
| + | [[Category: Large Structures]] | ||
| + | [[Category: Thermotoga maritima MSB8]] | ||
Current revision
Crystal structure of Acetyl xylan esterase (TM0077) from Thermotoga maritima at 2.10 A resolution
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