1apy
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HUMAN ASPARTYLGLUCOSAMINIDASE
OverviewOverview
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.
DiseaseDisease
Known disease associated with this structure: Aspartylglucosaminuria OMIM:[208400]
About this StructureAbout 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.
ReferenceReference
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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