View source for 1olq


==The Trichoderma reesei cel12a P201C mutant, structure at 1.7 A resolution==
<StructureSection load='1olq' size='340' side='right'caption='[[1olq]], [[Resolution|resolution]] 1.70&Aring;' scene=''>
== Structural highlights ==
<table><tr><td colspan='2'>[[1olq]] is a 2 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=1OLQ OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=1OLQ 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]] 1.7&#8491;</td></tr>
<tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=NAG:N-ACETYL-D-GLUCOSAMINE'>NAG</scene>, <scene name='pdbligand=PCA:PYROGLUTAMIC+ACID'>PCA</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=1olq FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=1olq OCA], [https://pdbe.org/1olq PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=1olq RCSB], [https://www.ebi.ac.uk/pdbsum/1olq PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=1olq ProSAT]</span></td></tr>
</table>
== Function ==
[https://www.uniprot.org/uniprot/O00095_HYPJE O00095_HYPJE] 
== 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/ol/1olq_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=1olq ConSurf].
<div style="clear:both"></div>
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== Publication Abstract from PubMed ==
As part of a program to discover improved glycoside hydrolase family 12 (GH 12) endoglucanases, we have extended our previous work on the structural and biochemical diversity of GH 12 homologs to include the most stable fungal GH 12 found, Humicola grisea Cel12A. The H. grisea enzyme was much more stable to irreversible thermal denaturation than the Trichoderma reesei enzyme. It had an apparent denaturation midpoint (T(m)) of 68.7 degrees C, 14.3 degrees C higher than the T. reesei enzyme. There are an additional three cysteines found in the H. grisea Cel12A enzyme. To determine their importance for thermal stability, we constructed three H. grisea Cel12A single mutants in which these cysteines were exchanged with the corresponding residues in the T. reesei enzyme. We also introduced these cysteine residues into the T. reesei enzyme. The thermal stability of these variants was determined. Substitutions at any of the three positions affected stability, with the largest effect seen in H. grisea C206P, which has a T(m) 9.1 degrees C lower than that of the wild type. The T. reesei cysteine variant that gave the largest increase in stability, with a T(m) 3.9 degrees C higher than wild type, was the P201C mutation, the converse of the destabilizing C206P mutation in H. grisea. To help rationalize the results, we have determined the crystal structure of the H. grisea enzyme and of the most stable T. reesei cysteine variant, P201C. The three cysteines in H. grisea Cel12A play an important role in the thermal stability of this protein, although they are not involved in a disulfide bond.

The Humicola grisea Cel12A enzyme structure at 1.2 A resolution and the impact of its free cysteine residues on thermal stability.,Sandgren M, Gualfetti PJ, Paech C, Paech S, Shaw A, Gross LS, Saldajeno M, Berglund GI, Jones TA, Mitchinson C Protein Sci. 2003 Dec;12(12):2782-93. PMID:14627738<ref>PMID:14627738</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 1olq" style="background-color:#fffaf0;"></div>

==See Also==
*[[Glucanase 3D structures|Glucanase 3D structures]]
== References ==
<references/>
__TOC__
</StructureSection>
[[Category: Large Structures]]
[[Category: Trichoderma reesei]]
[[Category: Berglund GI]]
[[Category: Gross LS]]
[[Category: Gualfetti PJ]]
[[Category: Jones TA]]
[[Category: Mitchinson C]]
[[Category: Saldajeno M]]
[[Category: Sandgren M]]
[[Category: Shaw A]]