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[[Image:1h1a.gif|left|200px]]<br />
<applet load="1h1a" size="450" color="white" frame="true" align="right" spinBox="true"
caption="1h1a, resolution 1.75&Aring;" />
'''THERMOPHILIC B-1,4-XYLANASE FROM CHAETOMIUM THERMOPHILUM'''<br />


==Overview==
==Thermophilic beta-1,4-xylanase from Chaetomium thermophilum==
The crystal structures of thermophilic xylanases from Chaetomium, thermophilum and Nonomuraea flexuosa were determined at 1.75 and 2.1 A, resolution, respectively. Both enzymes have the overall fold typical to, family 11 xylanases with two highly twisted beta-sheets forming a large, cleft. The comparison of 12 crystal structures of family 11 xylanases from, both mesophilic and thermophilic organisms showed that the structures of, different xylanases are very similar. The sequence identity differences, correlated well with the structural differences. Several minor, modifications appeared to be responsible for the increased thermal, stability of family 11 xylanases: (a) higher Thr : Ser ratio (b) increased, number of charged residues, especially Arg, resulting in enhanced polar, interactions, and (c) improved stabilization of secondary structures, involved the higher number of residues in the beta-strands and, stabilization of the alpha-helix region. Some members of family 11, xylanases have a unique strategy to improve their stability, such as a, higher number of ion pairs or aromatic residues on protein surface, a more, compact structure, a tighter packing, and insertions at some regions, resulting in enhanced interactions.
<StructureSection load='1h1a' size='340' side='right'caption='[[1h1a]], [[Resolution|resolution]] 1.75&Aring;' scene=''>
== Structural highlights ==
<table><tr><td colspan='2'>[[1h1a]] is a 2 chain structure with sequence from [https://en.wikipedia.org/wiki/Chaetomium_thermophilum Chaetomium thermophilum]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1H1A OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=1H1A 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]] 1.75&#8491;</td></tr>
<tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=CA:CALCIUM+ION'>CA</scene>, <scene name='pdbligand=GOL:GLYCEROL'>GOL</scene>, <scene name='pdbligand=PCA:PYROGLUTAMIC+ACID'>PCA</scene>, <scene name='pdbligand=SO4:SULFATE+ION'>SO4</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=1h1a FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=1h1a OCA], [https://pdbe.org/1h1a PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=1h1a RCSB], [https://www.ebi.ac.uk/pdbsum/1h1a PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=1h1a ProSAT]</span></td></tr>
</table>
== Function ==
[https://www.uniprot.org/uniprot/Q8J1V6_9PEZI Q8J1V6_9PEZI]
== 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/h1/1h1a_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=1h1a ConSurf].
<div style="clear:both"></div>
<div style="background-color:#fffaf0;">
== Publication Abstract from PubMed ==
The crystal structures of thermophilic xylanases from Chaetomium thermophilum and Nonomuraea flexuosa were determined at 1.75 and 2.1 A resolution, respectively. Both enzymes have the overall fold typical to family 11 xylanases with two highly twisted beta-sheets forming a large cleft. The comparison of 12 crystal structures of family 11 xylanases from both mesophilic and thermophilic organisms showed that the structures of different xylanases are very similar. The sequence identity differences correlated well with the structural differences. Several minor modifications appeared to be responsible for the increased thermal stability of family 11 xylanases: (a) higher Thr : Ser ratio (b) increased number of charged residues, especially Arg, resulting in enhanced polar interactions, and (c) improved stabilization of secondary structures involved the higher number of residues in the beta-strands and stabilization of the alpha-helix region. Some members of family 11 xylanases have a unique strategy to improve their stability, such as a higher number of ion pairs or aromatic residues on protein surface, a more compact structure, a tighter packing, and insertions at some regions resulting in enhanced interactions.


==About this Structure==
Three-dimensional structures of thermophilic beta-1,4-xylanases from Chaetomium thermophilum and Nonomuraea flexuosa. Comparison of twelve xylanases in relation to their thermal stability.,Hakulinen N, Turunen O, Janis J, Leisola M, Rouvinen J Eur J Biochem. 2003 Apr;270(7):1399-412. PMID:12653995<ref>PMID:12653995</ref>
1H1A is a [http://en.wikipedia.org/wiki/Single_protein Single protein] structure of sequence from [http://en.wikipedia.org/wiki/Chaetomium_thermophilum Chaetomium thermophilum] with SO4, CA, S and GOL as [http://en.wikipedia.org/wiki/ligands ligands]. Active as [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] Structure known Active Site: S1A. Full crystallographic information is available from [http://ispc.weizmann.ac.il/oca-bin/ocashort?id=1H1A OCA].


==Reference==
From MEDLINE&reg;/PubMed&reg;, a database of the U.S. National Library of Medicine.<br>
Three-dimensional structures of thermophilic beta-1,4-xylanases from Chaetomium thermophilum and Nonomuraea flexuosa. Comparison of twelve xylanases in relation to their thermal stability., Hakulinen N, Turunen O, Janis J, Leisola M, Rouvinen J, Eur J Biochem. 2003 Apr;270(7):1399-412. PMID:[http://ispc.weizmann.ac.il//pmbin/getpm?pmid=12653995 12653995]
</div>
<div class="pdbe-citations 1h1a" style="background-color:#fffaf0;"></div>
== References ==
<references/>
__TOC__
</StructureSection>
[[Category: Chaetomium thermophilum]]
[[Category: Chaetomium thermophilum]]
[[Category: Endo-1,4-beta-xylanase]]
[[Category: Large Structures]]
[[Category: Single protein]]
[[Category: Hakulinen N]]
[[Category: Hakulinen, N.]]
[[Category: Rouvinen J]]
[[Category: Rouvinen, J.]]
[[Category: CA]]
[[Category: GOL]]
[[Category: S]]
[[Category: SO4]]
[[Category: family 11]]
[[Category: glycosyl hydrolase]]
[[Category: thermostability glycosidase]]
[[Category: xylanase]]
 
''Page seeded by [http://ispc.weizmann.ac.il/oca OCA ] on Mon Nov  5 13:01:40 2007''

Latest revision as of 08:29, 6 November 2024

Thermophilic beta-1,4-xylanase from Chaetomium thermophilum

1h1a, resolution 1.75Å

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