4o8p: Difference between revisions

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'''Unreleased structure'''
==Crystal structure of SthAraf62A, a GH62 family alpha-L-arabinofuranosidase from Streptomyces thermoviolaceus, bound to xylotetraose==
<StructureSection load='4o8p' size='340' side='right' caption='[[4o8p]], [[Resolution|resolution]] 1.56&Aring;' scene=''>
== Structural highlights ==
<table><tr><td colspan='2'>[[4o8p]] is a 1 chain structure. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=4O8P OCA]. For a <b>guided tour on the structure components</b> use [http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=4O8P FirstGlance]. <br>
</td></tr><tr><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat"><scene name='pdbligand=CA:CALCIUM+ION'>CA</scene>, <scene name='pdbligand=K:POTASSIUM+ION'>K</scene>, <scene name='pdbligand=PE3:3,6,9,12,15,18,21,24,27,30,33,36,39-TRIDECAOXAHENTETRACONTANE-1,41-DIOL'>PE3</scene>, <scene name='pdbligand=XYP:BETA-D-XYLOPYRANOSE'>XYP</scene><br>
<tr><td class="sblockLbl"><b>[[Related_structure|Related:]]</b></td><td class="sblockDat">[[4o8n|4o8n]], [[4o8o|4o8o]]</td></tr>
<tr><td class="sblockLbl"><b>Resources:</b></td><td class="sblockDat"><span class='plainlinks'>[http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=4o8p FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=4o8p OCA], [http://www.rcsb.org/pdb/explore.do?structureId=4o8p RCSB], [http://www.ebi.ac.uk/pdbsum/4o8p PDBsum]</span></td></tr>
<table>
<div style="background-color:#fffaf0;">
== Publication Abstract from PubMed ==
Xylan debranching enzymes facilitate the complete hydrolysis of xylan and can be used to alter xylan chemistry. Herein, the GH62 family alpha-l-arabinofuranosidase from Streptomyces thermoviolaceus (SthAbf62A) was shown to have a half-life of 60 min at 60 degrees C, and ability to cleave alpha-1,3 l-arabinofuranose (l-Araf ) from singly-substituted xylopyranosyl (Xylp) backbone residues in wheat arabinoxylan; low activity towards arabinan as well as 4-nitrophenyl alpha-l-arabinofuranoside was also detected. After selectively removing alpha-1,3 l-Araf substituents from di-substituted Xylp residues present in wheat arabinoxylan, SthAbf62A could also cleave the remaining alpha-1,2 l-Araf substituents, confirming the ability of SthAbf62A to remove alpha-l-Araf residues that are (1--&gt;2) and (1--&gt;3) linked to mono-substituted beta-d-Xylp sugars. Three-dimensional structures of SthAbf62A and its complex with xylotetraose and l-arabinose confirmed a five-bladed beta-propeller fold and revealed a molecular Velcro in blade V between the beta1 and beta21 strands, a disulfide bond between Cys 27 and Cys 297, and a calcium ion coordinated in the central channel of the fold. The enzyme-arabinose complex structure further revealed a narrow and seemingly rigid l-arabinose binding pocket situated at the center of one side of the beta propeller, which stabilized the arabinofuranosyl substituent through several hydrogen-bonding and hydrophobic interactions. The predicted catalytic amino acids were oriented towards this binding pocket and the catalytic essentiality of Asp53 and Glu213 was confirmed by site-specific mutagenesis. Complex structures with xylotetraose revealed a shallow cleft for xylan backbone binding which is open at both ends and comprises multiple binding subsites above and flanking the l-arabinose binding pocket.


The entry 4o8p is ON HOLD  until Paper Publication
Biochemical and structural characterization of a thermostable family GH62 alpha-l-arabinofuranosidase from Streptomyces thermoviolaceus to elucidate the molecular basis for activity towards arabinoxylan.,Wang W, Mai-Gisondi G, Stogios PJ, Kaur A, Xu X, Cui H, Turunen O, Savchenko A, Master ER Appl Environ Microbiol. 2014 Jun 20. pii: AEM.00685-14. PMID:24951792<ref>PMID:24951792</ref>


Authors: Stogios, P.J., Wang, W., Xu, X., Cui, H., Master, E., Savchenko, A.
From MEDLINE&reg;/PubMed&reg;, a database of the U.S. National Library of Medicine.<br>
 
</div>
Description: Crystal structure of SthAraf62A, a GH62 family alpha-L-arabinofuranosidase from Streptomyces thermoviolaceus, bound to xylotetraose
== References ==
<references/>
__TOC__
</StructureSection>
[[Category: Cui, H.]]
[[Category: Master, E.]]
[[Category: Savchenko, A.]]
[[Category: Stogios, P J.]]
[[Category: Wang, W.]]
[[Category: Xu, X.]]
[[Category: 5-fold beta-propeller]]
[[Category: Alpha-l-arabinofuranosidase]]
[[Category: Gh62]]
[[Category: Glycosyl hydrolase family 62]]
[[Category: Hydrolase]]
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