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Crystal structure of the cysteine-rich domain of mannose receptor complexed with a sulfated carbohydrate ligand



Crystal structure of the cysteine-rich domain of mannose receptor complexed with a sulfated carbohydrate ligand



Journal of Experimental Medicine 191(7): 1105-1116



The macrophage and epithelial cell mannose receptor (MR) binds carbohydrates on foreign and host molecules. Two portions of MR recognize carbohydrates: tandemly arranged C-type lectin domains facilitate carbohydrate-dependent macrophage uptake of infectious organisms, and the NH2-terminal cysteine-rich domain (Cys-MR) binds to sulfated glycoproteins including pituitary hormones. To elucidate the mechanism of sulfated carbohydrate recognition, we determined crystal structures of Cys-MR alone and complexed with 4-sulfated-N-acetylgalactosamine at 1.7 and 2.2 ANG resolution, respectively. Cys-MR folds into an approximately three-fold symmetric beta-trefoil shape resembling fibroblast growth factor. The sulfate portions of 4-sulfated-N-acetylgalactosamine and an unidentified ligand found in the native crystals bind in a neutral pocket in the third lobe. We use the structures to rationalize the carbohydrate binding specificities of Cys-MR and compare the recognition properties of Cys-MR with other beta-trefoil proteins.

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Accession: 010400187

Download citation: RISBibTeXText

PMID: 10748229

DOI: 10.1084/jem.191.7.1105


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