Download MendeleyStructure of human beta-glucuronidase reveals candidate lysosomal targeting and active-site motifs.
Jain, S., Drendel, W.B., Chen, Z.W., Mathews, F.S., Sly, W.S., Grubb, J.H.(1996) Nat Struct Biol 3: 375-381
- PubMed: 8599764
- DOI: https://doi.org/10.1038/nsb0496-375
- Primary Citation of Related Structures:
1BHG - PubMed Abstract:
The X-ray structure of the homotetrameric lysosomal acid hydrolase, human beta-glucuronidase (332,000 Mr), has been determined at 2.6 A resolution. The tetramer has approximate dihedral symmetry and each promoter consists of three structural domains with topologies similar to a jelly roll barrel, an immunoglobulin constant domain and a TIM barrel respectively. Residues 179-204 form a beta-hairpin motif similar to the putative lysosomal targeting motif of cathepsin D, supporting the view that lysosomal targeting has a structural basis. The active site of the enzyme is formed from a large cleft at the interface of two monomers. Residues Glu 451 and Glu 540 are proposed to be important for catalysis. The structure establishes a framework for understanding mutations that lead to the human genetic disease mucopolysaccharidosis VII, and for using the enzyme in anti-cancer therapy.
Organizational Affiliation:
Department of Biochemistry, St. Louis University School of Medicine, St. Louis, Missouri 63104, USA.
