1k9d: Difference between revisions

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[[Image:1k9d.gif|left|200px]]
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[[Image:1k9d.png|left|200px]]


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{{STRUCTURE_1k9d|  PDB=1k9d  |  SCENE=  }}  
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'''The 1.7 A crystal structure of alpha-D-glucuronidase, a family-67 glycoside hydrolase from Bacillus stearothermophilus T-1'''
===The 1.7 A crystal structure of alpha-D-glucuronidase, a family-67 glycoside hydrolase from Bacillus stearothermophilus T-1===




==Overview==
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Alpha-glucuronidases cleave the alpha-1,2-glycosidic bond between 4-O-methyl-d-glucuronic acid and short xylooligomers as part of the hemicellulose degradation system. To date, all of the alpha-glucuronidases are classified as family 67 glycosidases, which catalyze the hydrolysis via the investing mechanism. Here we describe several high resolution crystal structures of the alpha-glucuronidase (AguA) from Geobacillus stearothermophilus, in complex with its substrate and products. In the complex of AguA with the intact substrate, the 4-O-methyl-d-glucuronic acid sugar ring is distorted into a half-chair conformation, which is closer to the planar conformation required for the oxocarbenium ion-like transition state structure. In the active site, a water molecule is coordinated between two carboxylic acids, in an appropriate position to act as a nucleophile. From the structural data it is likely that two carboxylic acids, Asp(364) and Glu(392), activate together the nucleophilic water molecule. The loop carrying the catalytic general acid Glu(285) cannot be resolved in some of the structures but could be visualized in its "open" and "closed" (catalytic) conformations in other structures. The protonated state of Glu(285) is presumably stabilized by its proximity to the negative charge of the substrate, representing a new variation of substrate-assisted catalysis mechanism.
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{{ABSTRACT_PUBMED_14573597}}


==About this Structure==
==About this Structure==
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[[Category: Zaide, G.]]
[[Category: Zaide, G.]]
[[Category: Hydrolase]]
[[Category: Hydrolase]]
''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Fri May 2 22:28:01 2008''
 
''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Wed Jul 2 09:59:20 2008''

Revision as of 06:59, 2 July 2008

File:1k9d.png

Template:STRUCTURE 1k9d

The 1.7 A crystal structure of alpha-D-glucuronidase, a family-67 glycoside hydrolase from Bacillus stearothermophilus T-1

Template:ABSTRACT PUBMED 14573597

About this Structure

1K9D is a Single protein structure of sequence from Geobacillus stearothermophilus. Full crystallographic information is available from OCA.

Reference

Crystal structures of Geobacillus stearothermophilus alpha-glucuronidase complexed with its substrate and products: mechanistic implications., Golan G, Shallom D, Teplitsky A, Zaide G, Shulami S, Baasov T, Stojanoff V, Thompson A, Shoham Y, Shoham G, J Biol Chem. 2004 Jan 23;279(4):3014-24. Epub 2003 Oct 22. PMID:14573597

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