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Glycobiology, 2001, Vol. 11, No. 11 989-996
© 2001 Oxford University Press

Minimal requirements for the binding of selectin ligands to a C-type carbohydrate-recognition domain

Samuel Bouyain, Sally Rushton and Kurt Drickamer1

Glycobiology Institute, Department of Biochemistry, University of Oxford, Oxford OX1 3QU, UK

The C-type carbohydrate-recognition domains of E-selectin and rat serum mannose-binding protein have similar structures. Selectin/mannose-binding protein chimeras created by transfer of key sequences from E-selectin into mannose-binding protein have previously been shown to bind the selectin ligand sialyl-LewisX through a Ca2+-dependent subsite, common to many C-type lectins, and an accessory site containing positively charged amino acid residues. Further characterization of these chimeras as well as analysis of novel constructs containing additional regions of E-selectin demonstrate that selectin-like interaction with sialyl-LewisX can be faithfully reproduced even though structural evidence indicates that the mechanisms of binding to E-selectin and the chimeras are different. Selectin-like binding to the nonfucosylated sulfatide and sulfoglucuronyl glycolipids can also be reproduced with selectin/mannose-binding protein chimeras that contain the two subsites involved in sialyl-LewisX binding. These results indicate that binding of structurally distinct anionic glycans to C-type carbohydrate-recognition domains can be mediated by the Ca2+-dependent subsite in combination with a positively charged region that forms an ionic strength-sensitive subsite.

1 To whom correspondence should be addressed


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