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J. Biol. Chem., Vol. 277, Issue 33, 30144-30152, August 16, 2002
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From the Friedrich Miescher Institute for Biomedical Research,
Maulbeerstrasse 66, CH-4058 Basel, Switzerland
Serine phosphorylation of the ShcA signaling
molecule has been reported recently. In this work, we have
identified 12-O-tetradecanoylphorbol-13-acetate (TPA)- and
growth factor-induced serine/threonine phosphorylation sites in
p52Shc and p66Shc. Among them,
Ser29 in p52Shc (equivalent to
Ser138 in p66Shc) was phosphorylated only after
TPA stimulation. Phosphorylation of this site together with the intact
phosphotyrosine-binding domain was essential for ShcA binding to the
protein-tyrosine phosphatase PTP-PEST. TPA-induced ShcA phosphorylation
at this site (and hence, its association with PTP-PEST) was inhibited by a protein kinase C-specific inhibitor and was induced by
overexpression of constitutively active mutants of protein kinase C
Serine/Threonine Phosphorylation of ShcA
REGULATION OF PROTEIN-TYROSINE PHOSPHATASE-PEST BINDING AND
INVOLVEMENT IN INSULIN SIGNALING*
,
§,
,
-
, and -
isoforms. Insulin also induced ShcA/PTP-PEST
association, although to a lesser extent than TPA. Overexpression of a
PTP-PEST binding-defective mutant of p52Shc (S29A) enhanced
insulin-induced ERK activation in insulin receptor-overexpressing HIRc-B cells. Consistent with this, p52Shc S29A was more
tyrosine-phosphorylated than wild-type p52Shc after insulin
stimulation. Thus, we have identified a new mechanism whereby serine
phosphorylation of ShcA controls the ability of its
phosphotyrosine-binding domain to bind PTP-PEST, which is responsible
for the dephosphorylation and down-regulation of ShcA after insulin stimulation.
*
The costs of publication of this
article were defrayed in part by the
payment of page charges. The article
must therefore be hereby marked
"advertisement" in
accordance with 18 U.S.C. Section
1734 solely to indicate this fact.
Both authors contributed equally to this work.
§
Present address: Dept. of Biology, Kyushu University Graduate
School, Faculty of Sciences, 6-10-1 Hakozaki, Higashi-ku, Fukuoka 812-8581, Japan.
¶
To whom correspondence should be addressed. Tel.:
41-61-697-6669; Fax: 41-61-697-3976; E-mail: Nagamine@fmi.ch.
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