View source for 2c79


==The structure of a family 4 acetyl xylan esterase from Clostridium thermocellum in complex with a colbalt ion.==
<StructureSection load='2c79' size='340' side='right'caption='[[2c79]], [[Resolution|resolution]] 1.50&Aring;' scene=''>
== Structural highlights ==
<table><tr><td colspan='2'>[[2c79]] is a 1 chain structure with sequence from [https://en.wikipedia.org/wiki/Acetivibrio_thermocellus Acetivibrio thermocellus]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=2C79 OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=2C79 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]] 1.5&#8491;</td></tr>
<tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=CO:COBALT+(II)+ION'>CO</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=2c79 FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=2c79 OCA], [https://pdbe.org/2c79 PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=2c79 RCSB], [https://www.ebi.ac.uk/pdbsum/2c79 PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=2c79 ProSAT]</span></td></tr>
</table>
== Function ==
[https://www.uniprot.org/uniprot/O87119_ACETH O87119_ACETH] 
== 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/c7/2c79_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/main_output.php?pdb_ID=2c79 ConSurf].
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== Publication Abstract from PubMed ==
The enzymatic degradation of plant cell wall xylan requires the concerted action of a diverse enzymatic syndicate. Among these enzymes are xylan esterases, which hydrolyze the O-acetyl substituents, primarily at the O-2 position of the xylan backbone. All acetylxylan esterase structures described previously display a alpha/beta hydrolase fold with a "Ser-His-Asp" catalytic triad. Here we report the structures of two distinct acetylxylan esterases, those from Streptomyces lividans and Clostridium thermocellum, in native and complex forms, with x-ray data to between 1.6 and 1.0 A resolution. We show, using a novel linked assay system with PNP-2-O-acetylxyloside and a beta-xylosidase, that the enzymes are sugar-specific and metal ion-dependent and possess a single metal center with a chemical preference for Co2+. Asp and His side chains complete the catalytic machinery. Different metal ion preferences for the two enzymes may reflect the surprising diversity with which the metal ion coordinates residues and ligands in the active center environment of the S. lividans and C. thermocellum enzymes. These "CE4" esterases involved in plant cell wall degradation are shown to be closely related to the de-N-acetylases involved in chitin and peptidoglycan degradation (Blair, D. E., Schuettelkopf, A. W., MacRae, J. I., and Aalten, D. M. (2005) Proc. Natl. Acad. Sci. U. S. A., 102, 15429-15434), which form the NodB deacetylase "superfamily."

Structure and activity of two metal ion-dependent acetylxylan esterases involved in plant cell wall degradation reveals a close similarity to peptidoglycan deacetylases.,Taylor EJ, Gloster TM, Turkenburg JP, Vincent F, Brzozowski AM, Dupont C, Shareck F, Centeno MS, Prates JA, Puchart V, Ferreira LM, Fontes CM, Biely P, Davies GJ J Biol Chem. 2006 Apr 21;281(16):10968-75. Epub 2006 Jan 23. PMID:16431911<ref>PMID:16431911</ref>

From MEDLINE&reg;/PubMed&reg;, a database of the U.S. National Library of Medicine.<br>
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<div class="pdbe-citations 2c79" style="background-color:#fffaf0;"></div>

==See Also==
*[[Acetylxylan esterase 3D structures|Acetylxylan esterase 3D structures]]
== References ==
<references/>
__TOC__
</StructureSection>
[[Category: Acetivibrio thermocellus]]
[[Category: Large Structures]]
[[Category: Biely P]]
[[Category: Brzozowski AM]]
[[Category: Centeno MSJ]]
[[Category: Davies GJ]]
[[Category: Dupont C]]
[[Category: Ferreira LMA]]
[[Category: Fontes CMGA]]
[[Category: Gloster TM]]
[[Category: Prates JAM]]
[[Category: Shareck F]]
[[Category: Taylor EJ]]
[[Category: Turkenburg PJ]]
[[Category: Vincent F]]