Download MendeleyMolecular basis of lysosomal enzyme recognition: three-dimensional structure of the cation-dependent mannose 6-phosphate receptor.
Roberts, D.L., Weix, D.J., Dahms, N.M., Kim, J.J.(1998) Cell 93: 639-648
- PubMed: 9604938
- DOI: https://doi.org/10.1016/s0092-8674(00)81192-7
- Primary Citation of Related Structures:
1M6P - PubMed Abstract:
Targeting of newly synthesized lysosomal hydrolases to the lysosome is mediated by the cation-dependent mannose 6-phosphate receptor (CD-MPR) and the insulin-like growth factor II/cation-independent mannose 6-phosphate receptor (IGF-II/CI-MPR). The two receptors, which share sequence similarities, constitute the P-type family of animal lectins. We now report the three-dimensional structure of a glycosylation-deficient, yet fully functional form of the extracytoplasmic domain of the bovine CD-MPR (residues 3-154) complexed with mannose 6-phosphate at 1.8 A resolution. The extracytoplasmic domain of the CD-MPR crystallizes as a dimer, and each monomer folds into a nine-stranded flattened beta barrel, which bears a striking resemblance to avidin. The distance of 40 A between the two ligand-binding sites of the dimer provides a structural basis for the observed differences in binding affinity exhibited by the CD-MPR toward various lysosomal enzymes.
Organizational Affiliation:
Department of Biochemistry, Medical College of Wisconsin, Milwaukee 53226, USA.
