1px8: Difference between revisions

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[[Image:1px8.gif|left|200px]]
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[[Image:1px8.png|left|200px]]


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{{STRUCTURE_1px8|  PDB=1px8  |  SCENE=  }}  
{{STRUCTURE_1px8|  PDB=1px8  |  SCENE=  }}  


'''Crystal structure of beta-D-xylosidase from Thermoanaerobacterium saccharolyticum, a family 39 glycoside hydrolase'''
===Crystal structure of beta-D-xylosidase from Thermoanaerobacterium saccharolyticum, a family 39 glycoside hydrolase===




==Overview==
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1,4-beta-D-Xylan is the major component of plant cell-wall hemicelluloses. beta-D-Xylosidases are involved in the breakdown of xylans into xylose and belong to families 3, 39, 43, 52, and 54 of glycoside hydrolases. Here, we report the first crystal structure of a member of family 39 glycoside hydrolase, i.e. beta-D-xylosidase from Thermoanaerobacterium saccharolyticum strain B6A-RI. This study also represents the first structure of any beta-xylosidase of the above five glycoside hydrolase families. Each monomer of T. saccharolyticum beta-xylosidase comprises three distinct domains; a catalytic domain of the canonical (beta/alpha)(8)-barrel fold, a beta-sandwich domain, and a small alpha-helical domain. We have determined the structure in two forms: D-xylose-bound enzyme and a covalent 2-deoxy-2-fluoro-alpha-D-xylosyl-enzyme intermediate complex, thus providing two snapshots in the reaction pathway. This study provides structural evidence for the proposed double displacement mechanism that involves a covalent intermediate. Furthermore, it reveals possible functional roles for His228 as the auxiliary acid/base and Glu323 as a key residue in substrate recognition.
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{{ABSTRACT_PUBMED_14659747}}


==About this Structure==
==About this Structure==
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[[Category: Xylose]]
[[Category: Xylose]]
[[Category: Xylosidase]]
[[Category: Xylosidase]]
''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Sat May  3 05:35:34 2008''
 
''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Tue Jul 29 08:36:22 2008''

Revision as of 05:36, 29 July 2008

File:1px8.png

Template:STRUCTURE 1px8

Crystal structure of beta-D-xylosidase from Thermoanaerobacterium saccharolyticum, a family 39 glycoside hydrolase

Template:ABSTRACT PUBMED 14659747

About this Structure

1PX8 is a Single protein structure of sequence from Thermoanaerobacterium saccharolyticum. Full crystallographic information is available from OCA.

Reference

Crystal structure of beta-D-xylosidase from Thermoanaerobacterium saccharolyticum, a family 39 glycoside hydrolase., Yang JK, Yoon HJ, Ahn HJ, Lee BI, Pedelacq JD, Liong EC, Berendzen J, Laivenieks M, Vieille C, Zeikus GJ, Vocadlo DJ, Withers SG, Suh SW, J Mol Biol. 2004 Jan 2;335(1):155-65. PMID:14659747

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