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J. Exp. Med.,
Volume 188, Number 11, December 7, 1998 2083-2090
By


From the * Medical Research Council Cellular Immunology Unit, Sir William Dunn School of
Pathology, University of Oxford, Oxford OX1 3RE, United Kingdom; the 2B4 is a cell surface glycoprotein related to CD2 and implicated in the regulation of natural
killer and T lymphocyte function. A recombinant protein containing the extracellular region of
mouse (m)2B4 attached to avidin-coated fluorescent beads bound to rodent cells, and binding
was completely blocked by CD48 monoclonal antibodies (mAbs). Using surface plasmon resonance, we showed that purified soluble mCD48 bound m2B4 with a six- to ninefold higher affinity (Kd
Department of Molecular
Biology and Immunology, University of North Texas Health Science Center, Fort Worth, Texas
76107; and the § Department of Pathology, University of Texas Southwestern Medical Center,
Dallas, Texas 75235
16 µM at 37°C) than its other ligand, CD2. Human CD48 bound human 2B4
with a similar affinity (Kd
8 µM). The finding of an additional ligand for CD48 provides an
explanation for distinct functional effects observed on perturbing CD2 and CD48 with mAbs or by genetic manipulation.
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