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J. Biol. Chem., Vol. 276, Issue 19, 15840-15849, May 11, 2001
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From the Centro de Biología Molecular "Severo Ochoa,"
Universidad Autónoma de Madrid, Cantoblanco,
Madrid 28049, Spain
Transactivation by c-Rel (nuclear factor
Regulation of Nuclear Factor
B Transactivation
IMPLICATION OF PHOSPHATIDYLINOSITOL 3-KINASE AND PROTEIN KINASE
C
IN c-Rel ACTIVATION BY TUMOR NECROSIS FACTOR
*
B) was dependent on phosphorylation of several serines in the
transactivation domain, indicating that it is a
phosphorylation-dependent Ser-rich domain. By Ser
Ala
mutational and deletion analysis, we have identified two regions in
this domain: 1) a C-terminal region (amino acids 540-588), which is
required for basal activity; and 2) the 422-540 region, which responds
to external stimuli as tumor necrosis factor (TNF)
or phorbol
myristate acetate plus ionomycin. Ser from 454 to 473 were shown to be
required for TNF
-induced activation, whereas Ser between 492 and 519 were required for phorbol myristate acetate plus ionomycin activation.
Phosphatidylinositol 3-kinase (PI3K) and protein kinase C (PKC)
were identified as downstream signaling molecules of TNF
-activation
of c-Rel transactivating activity. Interestingly, dominant negative
forms of PI3K inhibited PKC
activation and dominant negative PKC
inhibited PI3K-mediated activation of c-Rel transactivating activity,
indicating a cross-talk between both enzymes. We have identified the
critical role of different Ser for PKC
- and PI3K-mediated responses.
Interestingly, those c-Rel mutants not only did not respond to TNF
but also acted as dominant negative forms of nuclear factor
B activation.
*
This work was supported by grants from Dirección
General de Investigación Científica y Técnica,
Fondo de Investigaciones Sanitarias, Comunidad Autónoma de
Madrid, and Fundación Ramón Areces.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.
To whom correspondence should be addressed. Tel.: 34-913978413;
Fax: 34-913974799; E-mail: mfresno@cbm.uam.es.
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