Download MendeleyThree-dimensional structure of human lysosomal aspartylglucosaminidase.
Oinonen, C., Tikkanen, R., Rouvinen, J., Peltonen, L.(1995) Nat Struct Biol 2: 1102-1108
- PubMed: 8846222
- DOI: https://doi.org/10.1038/nsb1295-1102
- Primary Citation of Related Structures:
1APY, 1APZ - PubMed Abstract:
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.
Organizational Affiliation:
Department of Chemistry, University of Joensuu, Finland.
