2qz2

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{{STRUCTURE_2qz2| PDB=2qz2 | SCENE= }}
{{STRUCTURE_2qz2| PDB=2qz2 | SCENE= }}
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'''Crystal structure of a glycoside hydrolase family 11 xylanase from Aspergillus niger in complex with xylopentaose'''
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===Crystal structure of a glycoside hydrolase family 11 xylanase from Aspergillus niger in complex with xylopentaose===
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==Overview==
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GH 11 (glycoside hydrolase family 11) xylanases are predominant enzymes in the hydrolysis of heteroxylan, an abundant structural polysaccharide in the plant cell wall. To gain more insight into the protein-ligand interactions of the glycone as well as the aglycone subsites of these enzymes, catalytically incompetent mutants of the Bacillus subtilis and Aspergillus niger xylanases were crystallized, soaked with xylo-oligosaccharides and subjected to X-ray analysis. For both xylanases, there was clear density for xylose residues in the -1 and -2 subsites. In addition, for the B. subtilis xylanase, there was also density for xylose residues in the -3 and +1 subsite showing the spanning of the -1/+1 subsites. These results, together with the observation that some residues in the aglycone subsites clearly adopt a different conformation upon substrate binding, allowed us to identify the residues important for substrate binding in the aglycone subsites. In addition to substrate binding in the active site of the enzymes, the existence of an unproductive second ligand-binding site located on the surface of both the B. subtilis and A. niger xylanases was observed. This extra binding site may have a function similar to the separate carbohydrate-binding modules of other glycoside hydrolase families.
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(as it appears on PubMed at http://www.pubmed.gov), where 17983355 is the PubMed ID number.
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{{ABSTRACT_PUBMED_17983355}}
==About this Structure==
==About this Structure==
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[[Category: Xylan degradation]]
[[Category: Xylan degradation]]
[[Category: Xylanase]]
[[Category: Xylanase]]
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''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Sun May 4 15:56:20 2008''
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''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Tue Jul 29 09:55:37 2008''

Revision as of 06:55, 29 July 2008

Image:2qz2.png

Template:STRUCTURE 2qz2

Crystal structure of a glycoside hydrolase family 11 xylanase from Aspergillus niger in complex with xylopentaose

Template:ABSTRACT PUBMED 17983355

About this Structure

2QZ2 is a Single protein structure of sequence from Aspergillus niger. Full crystallographic information is available from OCA.

Reference

Crystallographic analysis shows substrate binding at the -3 to +1 active-site subsites and at the surface of glycoside hydrolase family 11 endo-1,4-beta-xylanases., Vandermarliere E, Bourgois TM, Rombouts S, Van Campenhout S, Volckaert G, Strelkov SV, Delcour JA, Rabijns A, Courtin CM, Biochem J. 2008 Feb 15;410(1):71-9. PMID:17983355

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