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Hoffmann, R. A wiki for the life sciences where authorship matters. Nature Genetics (2008)

Difference in binding-site architecture of the serum-type and liver-type mannose-binding proteins.

The carbohydrate-recognition domains (CRDs) of the serum-type and the liver-type mannose-binding proteins (MBPs) from rat display different binding characteristics toward mannose-rich oligosaccharides derived from N-glycosides, despite the overall similarity in their binding site architecture, oligomeric status and actual binding specificity at the monosaccharide level. We found that the liver-type MBP CRD of rat (MBP-C) bound methyl glycosides of certain mannobioses and -trioses, which are part of the mannose-rich N-glycoside, more tightly than methyl alpha-mannopyranoside. In contrast, the serum-type MBP CRD of rat (MBP-A) bound all the methyl glycosides of manno-oligosaccharide and methyl alpha-mannopyranoside with similar affinities. The mannobiose and -triose most strongly bound to MBP-C CRD were Man alpha (1-2)Man alpha-OMe and Man alpha (1-2)Man alpha (1-6)Man alpha-OMe, respectively. From these and other data, we postulate that the binding site of MBP-C has an extended area of interaction, probably the size of a mannotriose, while MBP-A interacts essentially with one mannose residue.[1]


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