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Volume 272, Number 16, Issue of April 18, 1997 pp. 10957-10967
©1997 by The American Society for Biochemistry and Molecular Biology, Inc.

Autophosphorylation of Activation Loop Tyrosines Regulates Signaling by the TRK Nerve Growth Factor Receptor

(Received for publication, October 9, 1996, and in revised form, January 24, 1997)

Matthew E. Cunningham Dagger , Robert M. Stephens § , David R. Kaplan § and Lloyd A. Greene Dagger

From the Dagger  Department of Pathology and Center of Neurobiology and Behavior, College of Physicians and Surgeons, Columbia University, New York, New York 10032, the § ABL-Basic Research Program, Frederick, Maryland 21702, and the  Montreal Neurological Institute, McGill University, Montreal, Quebec H3A 2B4, Canada

Many receptor tyrosine kinases possess an "activation loop" containing three similarly placed tyrosine autophosphorylation sites. To examine their roles in the TRK NGF receptor, these residues (Tyr-670, Tyr-674, and Tyr-675) were mutated singly and in all combinations to phenylalanine and stably expressed in Trk-deficient PC12nnr5 cells. All mutant receptors showed significantly diminished nerve growth factor (NGF)-stimulated autophosphorylation, indicating impaired catalytic activity. NGF-induced neurite outgrowth exhibited dose-responsive behavior when transfectants were compared by relative receptor expression and exhibited a functional hierarchy: wild type > Y670F >=  Y674F >>  Y675F >=  YY670/674FF = YY670/675FF >>  YY674/675FF > YYY670/674/675FFF. NGF-induced tyrosine phosphorylation of Shc, ERKs, and SNT and immediate early gene inductions generally paralleled neurogenic potential. However, activation of phosphatidylinositol 3'-kinase and tyrosine phosphorylation of phospholipase Cgamma -1 was essentially abolished. The latter effect appears due to selective inability of the mutated TRKs to autophosphorylate the tyrosine residue (Tyr-785) required for binding phospholipase Cgamma -1 and indicates that the "activation loop" tyrosines participate in NGF-dependent changes in receptor conformation. Our findings stress the importance that expression levels play in assessing the consequences of receptor mutations and that all three activation loop tyrosines have roles regulating both overall and specific NGF-mediated signaling through TRK.


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