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CD2, CD48 and CD58 are structurally similar cell adhesion-molecules forming a subset of the immunoglobulin superfamily (IgSF). In humans CD58 is a ligand for CD2 while in mice CD2 binds CD48. We constructed a soluble chimeric molecule comprising the extracellular portion of rat CD48 and domains 3 and 4 of rat CD4 (sCD48-CD4) and used it to examine whether CD2 is a ligand for CD48 in rats. sCD48-CD4-coated polystyrene Dynabeads formed rosettes on rat CD2-transfected COS-7 cells, and this rosetting was blocked by anti-CD2 (OX34) and anti-CD48 (OX45) monoclonal antibodies. We used sucrose-gradient ultracentrifugation to show that sCD48-CD4 binds, in solution, to soluble forms of rat CD2 including the single NH2-terminal IgSF domain of rat CD2 expressed in bacteria. The upper limit of the affinity of the rat CD48-CD2 interaction is 4 x 10(5) M-1, lower than the published affinity of human CD2 for CD58. These results show that rat CD48 binds CD2 on its NH2-terminal IgSF domain with a low affinity and that binding is independent of glycosylation.

Original publication

DOI

10.1002/eji.1830230628

Type

Journal article

Journal

Eur J Immunol

Publication Date

06/1993

Volume

23

Pages

1373 - 1377

Keywords

Animals, Antigens, CD, Antigens, CD2, Antigens, Differentiation, T-Lymphocyte, Binding Sites, Binding, Competitive, CD48 Antigen, Cell Adhesion, Glycosylation, Ligands, Protein Binding, Rats, Receptors, Immunologic, Rosette Formation, Structure-Activity Relationship