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J. Biol. Chem., Vol. 278, Issue 20, 17969-17976, May 16, 2003
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From the Protein kinase D (PKD) is a member of
the AGC family of Ser/Thr kinases and is distantly related to
protein kinase C (PKC). Formerly known as PKCµ, PKD contains protein
domains not found in conventional PKC isoforms. A functional pleckstrin
homology (PH) domain is critical for the regulation of PKD activity.
Here we report that PKD is tyrosine-phosphorylated within the PH
domain, leading to activation. This phosphorylation is mediated by a
pathway that consists of the Src and Abl tyrosine kinases and occurs in response to stimulation with pervanadate and oxidative stress. Mutational analysis revealed three tyrosine phosphorylation sites (Tyr432, Tyr463, and Tyr502),
which are regulated by the Src-Abl pathway, and phosphorylation of only
one of these (Tyr463) leads to PKD activation. By using a
phospho-specific antibody, we show that Abl directly phosphorylates PKD
at Tyr463 in vitro, and in cells
phosphorylation of this site is sufficient to mediate full activation
of PKD. Mutation of the other two sites, Tyr432 and
Tyr502, had no significant influence on PKD activity. These
data reveal a tyrosine phosphorylation-dependent activation
mechanism for PKD and suggest that this event contributes to the
release of the autoinhibitory PKD PH domain leading to kinase
activation and downstream responses.
We dedicate this paper to the memory of Franz-Josef Johannes,
a friend, colleague, teacher, and mentor, whose contributions to the
PKCµ/PKD field will be greatly missed.
Tyrosine Phosphorylation of Protein Kinase D in the
Pleckstrin Homology Domain Leads to Activation*
,
,
§, and
¶
Department of Pathology, Beth Israel
Deaconess Medical Center, Harvard Medical School,
Boston, Massachusetts 02215 and § Fraunhofer Institute for
Interfacial Engineering and Biotechnology, 70569 Stuttgart, Germany
*
This work was supported by National Institutes of
Health Grant CA 75134 (to A. T.) and by Deutsche
Forschungsgemeinschaft Grant STO 439/1-1 (to P. S.).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.
Deceased.
¶
To whom correspondence should be addressed: Dept. of
Pathology, Beth Israel Deaconess Medical Center, 330 Brookline Ave., Boston, MA 02215. Tel.: 617-667-8535; Fax: 617-667-3616; E-mail: atoker@caregroup.harvard.edu.
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