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Mol Cell Biol, June 1998, p. 3245-3256, Vol. 18, No. 6
0270-7306/98/$04.00+0
Copyright © 1998, American Society for Microbiology. All rights reserved.
RACK1, a Receptor for Activated C Kinase and a
Homolog of the
Subunit of G Proteins, Inhibits Activity of
Src Tyrosine Kinases and Growth of NIH 3T3 Cells
Betty Y.
Chang,
Karen B.
Conroy,
Eric M.
Machleder, and
Christine A.
Cartwright*
Department of Medicine, Stanford University,
Stanford, California 94305
Received 26 September 1997/Returned for modification 2 December
1997/Accepted 2 March 1998
To isolate and characterize proteins that interact with the unique
domain and SH3 and SH2 domains of Src and potentially regulate Src
activity, we used the yeast two-hybrid assay to screen a human lung
fibroblast cDNA library. We identified RACK1, a receptor for activated
C kinase and a homolog of the
subunit of G proteins, as a
Src-binding protein. Using GST-Src fusion proteins, we determined that
RACK1 binds to the SH2 domain of Src. Coimmunoprecipitation of Src and
RACK1 was demonstrated with NIH 3T3 cells. Purified GST-RACK1 inhibited
the in vitro kinase activity of Src in a concentration-dependent manner. GST-RACK1 (2 µM) inhibited the activities of purified Src and
Lck tyrosine kinases by 40 to 50% but did not inhibit the activities
of three serine/threonine kinases that we tested. Tyrosine
phosphorylation on many cellular proteins decreased in 293T cells that
transiently overexpressed RACK1. Src activity and cell growth rates
decreased by 40 to 50% in NIH 3T3 cells that stably overexpressed
RACK1. Flow cytometric analyses revealed that RACK1-overexpressing
cells do not show an increased rate of necrosis or apoptosis but do
spend significantly more time in G0/G1 than do
wild-type cells. Prolongation of G0/G1 could account for the increased doubling time of RACK1-overexpressing cells.
We suggest that RACK1 exerts its effect on the NIH 3T3 cell cycle in
part by inhibiting Src activity.
*
Corresponding author. Mailing address: Medical School
Laboratory Surge Building P304, Stanford University School of Medicine, Stanford, CA 94305-5487. Phone: (650) 725-8464. Fax: (650) 723-5488. E-mail: Chris.Cartwright{at}Stanford.edu.
Mol Cell Biol, June 1998, p. 3245-3256, Vol. 18, No. 6
0270-7306/98/$04.00+0
Copyright © 1998, American Society for Microbiology. All rights reserved.
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