1apy
From Proteopedia
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==Overview== | ==Overview== | ||
| - | The high resolution crystal structure of human lysosomal, aspartylglucosaminidase (AGA) has been determined. This lysosomal enzyme, is synthesized as a single polypeptide precursor, which is immediately, post-translationally cleaved into alpha- and beta-subunits. Two alpha- and, beta-chains are found to pack together forming the final heterotetrameric, structure. The catalytically essential residue, the N-terminal threonine, of the beta-chain is situated in the deep pocket of the funnel-shaped, active site. On the basis of the structure of the enzyme-product complex, we present a catalytic mechanism for this lysosomal enzyme with an, exceptionally high pH optimum. The three-dimensional structure also allows, the prediction of the structural consequences of human mutations resulting, in | + | The high resolution crystal structure of human lysosomal, aspartylglucosaminidase (AGA) has been determined. This lysosomal enzyme, is synthesized as a single polypeptide precursor, which is immediately, post-translationally cleaved into alpha- and beta-subunits. Two alpha- and, beta-chains are found to pack together forming the final heterotetrameric, structure. The catalytically essential residue, the N-terminal threonine, of the beta-chain is situated in the deep pocket of the funnel-shaped, active site. On the basis of the structure of the enzyme-product complex, we present a catalytic mechanism for this lysosomal enzyme with an, exceptionally high pH optimum. The three-dimensional structure also allows, the prediction of the structural consequences of human mutations resulting, in aspartylglucosaminuria (AGU), a lysosomal storage disease. |
==About this Structure== | ==About this Structure== | ||
| - | 1APY is a | + | 1APY is a [http://en.wikipedia.org/wiki/Single_protein Single protein] structure of sequence from [http://en.wikipedia.org/wiki/Homo_sapiens Homo sapiens] with NAG as [http://en.wikipedia.org/wiki/ligand ligand]. Active as [http://en.wikipedia.org/wiki/N(4)-(beta-N-acetylglucosaminyl)-L-asparaginase N(4)-(beta-N-acetylglucosaminyl)-L-asparaginase], with EC number [http://www.brenda-enzymes.info/php/result_flat.php4?ecno=3.5.1.26 3.5.1.26] Structure known Active Sites: B1 and D1. Full crystallographic information is available from [http://ispc.weizmann.ac.il/oca-bin/ocashort?id=1APY OCA]. |
==Reference== | ==Reference== | ||
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[[Category: hydrolase]] | [[Category: hydrolase]] | ||
| - | ''Page seeded by [http://ispc.weizmann.ac.il/oca OCA ] on | + | ''Page seeded by [http://ispc.weizmann.ac.il/oca OCA ] on Mon Nov 5 15:11:25 2007'' |
Revision as of 13:06, 5 November 2007
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HUMAN ASPARTYLGLUCOSAMINIDASE
Overview
The high resolution crystal structure of human lysosomal, aspartylglucosaminidase (AGA) has been determined. This lysosomal enzyme, is synthesized as a single polypeptide precursor, which is immediately, post-translationally cleaved into alpha- and beta-subunits. Two alpha- and, beta-chains are found to pack together forming the final heterotetrameric, structure. The catalytically essential residue, the N-terminal threonine, of the beta-chain is situated in the deep pocket of the funnel-shaped, active site. On the basis of the structure of the enzyme-product complex, we present a catalytic mechanism for this lysosomal enzyme with an, exceptionally high pH optimum. The three-dimensional structure also allows, the prediction of the structural consequences of human mutations resulting, in aspartylglucosaminuria (AGU), a lysosomal storage disease.
About this Structure
1APY is a Single protein structure of sequence from Homo sapiens with NAG as ligand. Active as N(4)-(beta-N-acetylglucosaminyl)-L-asparaginase, with EC number 3.5.1.26 Structure known Active Sites: B1 and D1. Full crystallographic information is available from OCA.
Reference
Three-dimensional structure of human lysosomal aspartylglucosaminidase., Oinonen C, Tikkanen R, Rouvinen J, Peltonen L, Nat Struct Biol. 1995 Dec;2(12):1102-8. PMID:8846222
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