1SYO image
Entry Detail
PDB ID:
1SYO
Title:
N-terminal 3 domains of CI-MPR bound to mannose 6-phosphate
Biological Source:
Source Organism:
Host Organism:
PDB Version:
Deposition Date:
2004-04-01
Release Date:
2004-06-29
Method Details:
Experimental Method:
Resolution:
2.20 Å
R-Value Free:
0.28
R-Value Work:
0.22
R-Value Observed:
0.22
Space Group:
P 1 21 1
Macromolecular Entities
Polymer Type:polypeptide(L)
Description:cation-independent mannose 6-phosphate receptor
Chain IDs:A, B
Chain Length:432
Number of Molecules:2
Biological Source:Bos taurus
Modified Residue
Compound ID Chain ID Parent Comp ID Details 2D Image
ASN A ASN GLYCOSYLATION SITE
Primary Citation
The N-terminal carbohydrate recognition site of the cation-independent mannose 6-phosphate receptor
J.Biol.Chem. 279 34000 34009 (2004)
PMID: 15169779 DOI: 10.1074/jbc.M404588200

Abstact

The 300-kDa cation-independent mannose 6-phosphate receptor (CI-MPR) plays a critical role in the trafficking of newly synthesized mannose 6-phosphate-containing acid hydrolases to the lysosome. The receptor contains two high affinity carbohydrate recognition sites within its 15-domain extracytoplasmic region, with essential residues for carbohydrate recognition located in domain 3 and domain 9. Previous studies have shown that these two sites are distinct with respect to carbohydrate specificity. In addition, expression of truncated forms of the CI-MPR demonstrated that domain 9 can be expressed as an isolated domain, retaining high affinity (Kd approximately 1 nm) carbohydrate binding, whereas expression of domain 3 alone resulted in a protein capable of only low affinity binding (Kd approximately 1 microm) toward a lysosomal enzyme. In the current report the crystal structure of the N-terminal 432 residues of the CI-MPR, encompassing domains 1-3, was solved in the presence of bound mannose 6-phosphate. The structure reveals the unique architecture of this carbohydrate binding pocket and provides insight into the ability of this site to recognize a variety of mannose-containing sugars.

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