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Mol Cell Biol, April 1998, p. 2298-2308, Vol. 18, No. 4
0270-7306/98/$04.00+0
Copyright © 1998, American Society for Microbiology. All rights reserved.

Shc and Enigma Are Both Required for Mitogenic Signaling by Ret/ptc2

Kyle Durick,1 Gordon N. Gill,2 and Susan S. Taylor1,*

Department of Chemistry and Biochemistry1 and Department of Medicine,2 University of California, San Diego, La Jolla, California 92093-0654

Received 7 August 1997/Returned for modification 23 September 1997/Accepted 12 December 1997

Ret/ptc2 is a constitutively active, oncogenic form of the c-Ret receptor tyrosine kinase. Like the other papillary thyroid carcinoma forms of Ret, Ret/ptc2 is activated through fusion of the Ret tyrosine kinase domain to the dimerization domain of another protein. Investigation of requirements for Ret/ptc2 mitogenic activity, using coexpression with dominant negative forms of Ras and Raf, indicated that these proteins are required for mitogenic signaling by Ret/ptc2. Because activation of Ras requires recruitment of Grb2 and SOS to the plasma membrane, the subcellular distribution of Ret/ptc2 was investigated, and it was found to localize to the cell periphery. This localization was mediated by association with Enigma via the Ret/ptc2 sequence containing tyrosine 586. Because Shc interacts with MEN2 forms of Ret, and because phosphorylation of Shc results in Grb2 recruitment and subsequent signaling through Ras and Raf, the potential interaction between Ret/ptc2 and Shc was investigated. The PTB domain of Shc also interacted with Ret/ptc2 at tyrosine 586, and this association resulted in tyrosine phosphorylation of Shc. Coexpression of chimeric proteins demonstrated that mitogenic signaling from Ret/ptc2 required both recruitment of Shc and subcellular localization by Enigma. Because Shc and Enigma interact with the same site on a Ret/ptc2 monomer, dimerization of Ret/ptc2 allows assembly of molecular complexes that are properly localized via Enigma and transmit mitogenic signals via Shc.

* Corresponding author. Mailing address: Howard Hughes Medical Institute, University of California, San Diego, 9500 Gilman Dr., La Jolla, CA 92093-0654. Phone: (619) 534-3677. Fax: (619) 534-8193. E-mail: staylor{at}ucsd.edu.




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