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Protein kinase Cα activates RAF-1 by direct phosphorylation.
Nature 364, 249-252 (1993)
THE kinase Raf-1 can be activated by treatment of cells with mitogens and by the protein kinase C (PKC) activator 12-O-tetradecanoyl-phorbol-13-acetate (TPA) (reviewed in refs 1, 2). Activated Raf-1 triggers a protein kinase cascade by direct phosphorylation of MAP kinase kinase3-5, resulting in phosphorylation of ternary complex factor6 and Jun7,8 by MAP kinase. Here we investigate the molecular mechanism and biological consequences of PKCα-mediated Raf-1 activation in NIH3T3 fibroblasts. PKCα directly phosphorylates and activates Raf-1 both in vitro and in vivo. PKCα induces Raf-1 phosphorylation at several sites, including a serine residue at position 499. Mutation of serine at this position or at residue 259 does not abrogate Raf-1 stimulation by a combination of Ras plus the src tyrosine kinase Lck, but severely impedes Raf-1 activation by PKCα. Consistent with such a direct interaction is the observation that Raf-1 and PKCα cooperate in the transformation of NIH3T3 cells. The Ser499 phosphorylation site is necessary for this synergism.
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Publikationstyp
Artikel: Journalartikel
Dokumenttyp
Wissenschaftlicher Artikel
Sprache
englisch
Veröffentlichungsjahr
1993
HGF-Berichtsjahr
0
ISSN (print) / ISBN
0028-0836
e-ISSN
1476-4687
Zeitschrift
Nature
Quellenangaben
Band: 364,
Heft: 6434,
Seiten: 249-252
Verlag
Nature Publishing Group
Verlagsort
London
Begutachtungsstatus
Peer reviewed
PubMed ID
8321321
DOI
10.1038/364249a0
Scopus ID
0027326410
Erfassungsdatum
1993-12-31