© The Rockefeller University Press, 0022-1007/1999/8/375/ $5.00
The Journal of Experimental Medicine, Volume 190, Number 3, August 2, 1999 375-384
Proline Residues in Cd28 and the Src Homology (Sh)3 Domain of Lck Are Required for T Cell Costimulation
Amy D. Holdorfa,
Jonathan M. Greenb,
Steven D. Levinc,
Michael F. Dennyd,
David B. Strausd,
Vinzenz Linkb,
Paul S. Changeliane,
Paul M. Allena, and
Andrey S. Shawa
a From the Department of Pathology and Center for Immunology, Pulmonary Division, Washington University School of Medicine, St. Louis, Missouri 63110
b From the Department of Medicine, Pulmonary Division, Washington University School of Medicine, St. Louis, Missouri 63110
c Department of Immunology, University of Washington, Seattle, Washington 98195
d Department of Medicine, University of Chicago, Chicago, Illinois 60637
e Pfizer Central Research, Groton, Connecticut 06335
Dept. of Pathology, Box 8118, Washington University, 660 S. Euclid Ave., St. Louis, MO 63110.314-362-8888314-362-4614
shaw{at}immunology.wustl.edu
The Src family tyrosine kinases Lck and Fyn are critical for signaling via the T cell receptor. However, the exact mechanism of their activation is unknown. Recent crystal structures of Src kinases suggest that an important mechanism of kinase activation is via engagement of the Src homology (SH)3 domain by proline-containing sequences. To test this hypothesis, we identified several T cell membrane proteins that contain potential SH3 ligands. Here we demonstrate that Lck and Fyn can be activated by proline motifs in the CD28 and CD2 proteins, respectively. Supporting a role for Lck in CD28 signaling, we demonstrate that CD28 signaling in both transformed and primary T cells requires Lck as well as proline residues in CD28. These data suggest that Lck plays an essential role in CD28 costimulation.
Key Words: Lck CD28 costimulation tyrosine kinase SH3 domain
1used in this paper: GST, glutathione S transferase; ITAM, immunoreceptor tyrosine-based activation motif; MAP, mitogen-activated protein; SH, Src homology
© 1999 The Rockefeller University Press

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