View source for 3wdq


==Crystal structure of beta-mannanase from a symbiotic protist of the termite Reticulitermes speratus==
<StructureSection load='3wdq' size='340' side='right'caption='[[3wdq]], [[Resolution|resolution]] 1.30&Aring;' scene=''>
== Structural highlights ==
<table><tr><td colspan='2'>[[3wdq]] is a 1 chain structure with sequence from [https://en.wikipedia.org/wiki/Symbiotic_protist_of_Reticulitermes_speratus Symbiotic protist of Reticulitermes speratus]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=3WDQ OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=3WDQ 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]] 1.3&#8491;</td></tr>
<tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=MG:MAGNESIUM+ION'>MG</scene>, <scene name='pdbligand=NA:SODIUM+ION'>NA</scene>, <scene name='pdbligand=NAG:N-ACETYL-D-GLUCOSAMINE'>NAG</scene>, <scene name='pdbligand=SME:METHIONINE+SULFOXIDE'>SME</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=3wdq FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=3wdq OCA], [https://pdbe.org/3wdq PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=3wdq RCSB], [https://www.ebi.ac.uk/pdbsum/3wdq PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=3wdq ProSAT]</span></td></tr>
</table>
== Function ==
[https://www.uniprot.org/uniprot/H7CGE2_9EUKA H7CGE2_9EUKA] 
<div style="background-color:#fffaf0;">
== Publication Abstract from PubMed ==
Termites and their symbiotic protists have established a prominent dual lignocellulolytic system, which can be applied to the biorefinery process. One of the major components of lignocellulose from conifers is glucomannan, which comprises a heterogeneous combination of b-1,4-linked mannose and glucose. Mannanases are known to hydrolyze the internal linkage of the glucomannan backbone, but the specific mechanism by which they recognize and accommodate heteropolysaccharides is currently unclear. Here we report biochemical and structural analyses of glycoside hydrolase (GH) family 26 mannanase C (RsMan26C) from a symbiotic protist of the termite Reticulitermes speratus. RsMan26C was characterized based on its catalytic efficiency toward glucomannan, compared with pure mannan. The crystal structure of RsMan26C complexed with gluco-manno-oligosaccharide(s) explained its specificities for glucose and mannose at subsites -5 and -2, respectively, in addition to accommodation of both glucose and mannose at subsites -3 and -4. RsMan26C has a long open cleft with a hydrophobic platform of Trp94 at subsite -5, facilitating enzyme binding to polysaccharides. Notably, a unique oxidized Met85 specifically interacts with the equatorial O-2 of glucose at subsite -3. Our results collectively indicate that specific recognition and accommodation of glucose at the distal negative subsites confers efficient degradation of the heteropolysaccharide by mannanase.

Structural and Biochemical Analyses of Glycoside Hydrolase Family 26 beta-Mannanase from a Symbiotic Protist of the Termite Reticulitermes speratus.,Tsukagoshi H, Nakamura A, Ishida T, Touhara KK, Otagiri M, Moriya S, Samejima M, Igarashi K, Fushinobu S, Kitamoto K, Arioka M J Biol Chem. 2014 Feb 25. PMID:24570006<ref>PMID:24570006</ref>

From MEDLINE&reg;/PubMed&reg;, a database of the U.S. National Library of Medicine.<br>
</div>
<div class="pdbe-citations 3wdq" style="background-color:#fffaf0;"></div>
== References ==
<references/>
__TOC__
</StructureSection>
[[Category: Large Structures]]
[[Category: Symbiotic protist of Reticulitermes speratus]]
[[Category: Arioka M]]
[[Category: Fushinobu S]]
[[Category: Igarashi K]]
[[Category: Ishida T]]
[[Category: Kitamoto K]]
[[Category: Samejima M]]
[[Category: Touhara KK]]
[[Category: Tsukagoshi H]]