View source for 2qha


==From Structure to Function: Insights into the Catalytic Substrate Specificity and Thermostability Displayed by Bacillus subtilis mannanase BCman==
<StructureSection load='2qha' size='340' side='right'caption='[[2qha]], [[Resolution|resolution]] 1.45&Aring;' scene=''>
== Structural highlights ==
<table><tr><td colspan='2'>[[2qha]] is a 2 chain structure with sequence from [https://en.wikipedia.org/wiki/Bacillus_subtilis Bacillus subtilis]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=2QHA OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=2QHA 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]] 1.45&#8491;</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=ZN:ZINC+ION'>ZN</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=2qha FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=2qha OCA], [https://pdbe.org/2qha PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=2qha RCSB], [https://www.ebi.ac.uk/pdbsum/2qha PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=2qha ProSAT]</span></td></tr>
</table>
== Function ==
[https://www.uniprot.org/uniprot/Q5PSP8_BACIU Q5PSP8_BACIU] 
== 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/qh/2qha_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=2qha ConSurf].
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== Publication Abstract from PubMed ==
BCman, a beta-mannanase from the plant root beneficial bacterium Bacillus subtilis Z-2, has a potential to be used in the production of mannooligosaccharide, which shows defense induction activity on both melon and tobacco, and plays an important role in the biological control of plant disease. Here we report the biochemical properties and crystal structure of BCman-GH26 enzyme. Kinetic analysis reveals that BCman is an endo-beta-mannanase, specific for mannan, and has no activity on mannooligosaccharides. The catalytic acid/base Glu167 and nucleophile Glu266 are positioned on the beta4 and beta7 strands, respectively. The 1.45-A crystal structure reveals that BCman is a typical (beta/alpha)(8) folding type. One large difference from the saddle-shaped active center of other endo-beta-mannanases is the presence of a shallow-dish-shaped active center and substrate-binding site that are both unique to BCman. These differences are mainly due to important changes in the length and position of loop 1 (Phe37-Met47), loop 2 (Ser103-Ala134), loop3 (Phe162-Asn185), loop 4 (Tyr215-Ile236), loop 5 (Pro269-Tyr278), and loop 6 (Trp298-Gly309), all of which surround the active site. Data from isothermal titration calorimetry and crystallography indicated only two substrate-binding subsites (+1 and -1) within the active site of BCman. These two sites are involved in the enzyme's mannan degradation activity and in restricting the binding capacity for mannooligosaccharides. Binding and catalysis of BCman to mannan is mediated mainly by a surface containing a strip of solvent-exposed aromatic rings of Trp302, Trp298, Trp172, and Trp72. Additionally, BCman contains a disulfide bond (Cys66Cys86) and a special His1-His23-Glu336 metal-binding site. This secondary structure is a key factor in the enzyme's stability.

From structure to function: insights into the catalytic substrate specificity and thermostability displayed by Bacillus subtilis mannanase BCman.,Yan XX, An XM, Gui LL, Liang DC J Mol Biol. 2008 Jun 6;379(3):535-44. Epub 2008 Apr 7. PMID:18455734<ref>PMID:18455734</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 2qha" style="background-color:#fffaf0;"></div>

==See Also==
*[[Mannosidase 3D structures|Mannosidase 3D structures]]
== References ==
<references/>
__TOC__
</StructureSection>
[[Category: Bacillus subtilis]]
[[Category: Large Structures]]
[[Category: Liang DC]]
[[Category: Yan XX]]