1hl8: Difference between revisions

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[[Image:1hl8.gif|left|200px]]
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[[Image:1hl8.png|left|200px]]


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{{STRUCTURE_1hl8|  PDB=1hl8  |  SCENE=  }}  
{{STRUCTURE_1hl8|  PDB=1hl8  |  SCENE=  }}  


'''CRYSTAL STRUCTURE OF THERMOTOGA MARITIMA ALPHA-FUCOSIDASE'''
===CRYSTAL STRUCTURE OF THERMOTOGA MARITIMA ALPHA-FUCOSIDASE===




==Overview==
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Fucosylated glycoconjugates are involved in numerous biological events, and alpha-l-fucosidases, the enzymes responsible for their processing, are therefore of crucial importance. Deficiency in alpha-l-fucosidase activity is associated with fucosidosis, a lysosomal storage disorder characterized by rapid neurodegeneration, resulting in severe mental and motor deterioration. To gain insight into alpha-l-fucosidase function at the molecular level, we have determined the crystal structure of Thermotoga maritima alpha-l-fucosidase. This enzyme assembles as a hexamer and displays a two-domain fold, composed of a catalytic (beta/alpha)(8)-like domain and a C-terminal beta-sandwich domain. The structures of an enzyme-product complex and of a covalent glycosyl-enzyme intermediate, coupled with kinetic and mutagenesis studies, allowed us to identify the catalytic nucleophile, Asp(244), and the Bronsted acid/base, Glu(266). Because T. maritima alpha-l-fucosidase occupies a unique evolutionary position, being far more closely related to the mammalian enzymes than to any other prokaryotic homolog, a structural model of the human enzyme was built to document the structural consequences of the genetic mutations associated with fucosidosis.
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{{ABSTRACT_PUBMED_14715651}}


==About this Structure==
==About this Structure==
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[[Category: Glycoside hydrolase]]
[[Category: Glycoside hydrolase]]
[[Category: Thermostable]]
[[Category: Thermostable]]
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Revision as of 05:21, 1 July 2008

File:1hl8.png

Template:STRUCTURE 1hl8

CRYSTAL STRUCTURE OF THERMOTOGA MARITIMA ALPHA-FUCOSIDASE

Template:ABSTRACT PUBMED 14715651

About this Structure

1HL8 is a Single protein structure of sequence from Thermotoga maritima. Full crystallographic information is available from OCA.

Reference

Crystal structure of Thermotoga maritima alpha-L-fucosidase. Insights into the catalytic mechanism and the molecular basis for fucosidosis., Sulzenbacher G, Bignon C, Nishimura T, Tarling CA, Withers SG, Henrissat B, Bourne Y, J Biol Chem. 2004 Mar 26;279(13):13119-28. Epub 2004 Jan 8. PMID:14715651

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