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First published online 6 May 2003
doi: 10.1242/jcs.00466

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The SH4-Unique-SH3-SH2 domains dictate specificity in signaling that differentiate c-Yes from c-Src

Justin M. Summy^*,,1, Yong Qian^*,2, Bing-Hua Jiang¹, Anne Guappone-Koay¹, Amanda Gatesman¹, Xianglin Shi² and Daniel C. Flynn^1,

¹ Department of Microbiology, Immunology, and Cell Biology, and Mary Babb Randolph Cancer Center, West Virginia University School of Medicine, PO Box 9300, Morgantown, WV 26506, USA
² National Institute for Occupational Safety and Health, Pathology and Physiology Research Branch, Health Effects Laboratory Division, Morgantown, WV 26505, USA

Author for correspondence (e-mail: dflynn{at}hsc.wvu.edu)

Accepted 7 March 2003

c-Src and c-Yes are highly homologous members of the Src family of non-receptor tyrosine kinases. The overall sequence similarity between c-Src and c-Yes allows them to perform many overlapping functions. However, the phenotypes of the c-src and c-yes knockout mice, and cells derived from them, are quite different, indicating functional specificity between the two proteins. Specifically, c-src^-/- cells are deficient in several processes that require dynamic regulation of the actin cytoskeleton. In order to begin to understand why c-Yes is unable to compensate for c-Src signaling, we used a series of Src/Yes chimeras in which the non-catalytic functional domains of Src^527F were replaced by those of c-Yes. Using chicken embryo fibroblasts as a model system, our results indicate that the c-Yes N-terminal SH4-Unique domains are sufficient to inhibit the ability of Src^527F to alter cell morphology, induce actin filament rearrangements or stimulate motility or invasive potential. The data also indicate that the SH4-Unique-SH3-SH2 domains of c-Yes work cooperatively and prevent activation of signaling proteins associated with Src^527F transformation, including activation of phosphatidylinositol 3-kinase, phosphorylation of c-Raf and Akt and downregulation of RhoA-GTP. These data indicate that c-Yes may not modulate signals associated with c-Src-induced changes in actin filament integrity and may explain why c-Yes fails to compensate for c-Src signaling in src^-/- cells.

Key words: Yes, Src, Actin filaments, SH4 domain, Unique domain

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