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J. Biol. Chem., Vol. 276, Issue 30, 27793-27798, July 27, 2001
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From the Department of Urology, University of Texas Southwestern
Medical Center, Dallas, Texas 75390-9110
DOC-2/DAB2 (differentially expressed
in ovarian
carcinoma-2/disabled
2) appears to be a potential tumor suppressor gene with a
growth inhibitory effect on several cancer types. Previously, we have
shown that DOC-2/DAB2 suppresses protein kinase C-induced AP-1
activation, which is modulated by serine 24 phosphorylation in the N terminus of DOC-2/DAB2. However, the functional impact of the
C terminus of DOC-2/DAB2, containing three proline-rich domains, has
not been explored. In this study, we examined this functional role in
modulating signaling mediated by peptide growth factor receptor
tyrosine kinase, particularly because it involves the interaction with
Grb2. Using sequence-specific peptides, we found that the second
proline-rich domain of DOC-2/DAB2 is the key binding site to Grb2 in
the presence of growth factors. Such elevated binding interrupts the
binding between SOS and Grb2, which consequently suppresses downstream
ERK phosphorylation. Reduced ERK phosphorylation was restored when the
binding between DOC-2/DAB2 and Grb2 was interrupted by a specific
peptide or by increasing the expression of Grb2. Furthermore, the C
terminus of the DOC-2/DAB2 construct can inhibit the AP-1 activity
elicited by growth factors. We conclude that DOC-2/DAB2, a potent
negative regulator, can suppress ERK activation by interrupting the
binding between Grb2 and SOS that is elicited by peptide growth
factors. This study further illustrates that DOC-2/DAB2 has multiple
effects on the RAS-mediated signal cascades active in cancer cells.
To whom correspondence should be addressed: University of Texas
Southwestern Medical Center, Dept. of Urology, 5323 Harry Hines Blvd.,
Dallas, TX 75390-9110. Tel.: 214-648-3988; Fax: 214-648-8786; E-mail: JT.Hsieh@UTSouthwestern.edu.
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