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PMID: 1328860 Published · ppublish English Journal Article Research Support, Non-U.S. Gov't Research Support, U.S. Gov't, P.H.S.

Jun is phosphorylated by several protein kinases at the same sites that are modified in serum-stimulated fibroblasts.

Molecular and cellular biology ·Vol. 12 ·No. 10 ·1992-10-00 ·Pages 4694-705

Baker SJ, Kerppola TK, Luk D, Vandenberg MT, Marshak DR, Curran T, Abate C

Abstract

c-jun is a member of the family of immediate-early genes whose expression is induced by factors such as serum stimulation, phorbol ester, and differentiation signals. Here we show that increased Jun synthesis after serum stimulation is accompanied by a concomitant increase in phosphorylation. Several serine-threonine kinases were evaluated for their ability to phosphorylate Jun in vitro. p34cdc2, protein kinase C, casein kinase II, and pp44mapk phosphorylated Jun efficiently, whereas cyclic AMP-dependent protein kinase and glycogen synthase kinase III did not. The sites phosphorylated by p34cdc2 were similar to those phosphorylated in vivo after serum induction. The major sites of phosphorylation were mapped to serines 63, 73, and 246. Phosphorylation of full-length Jun with several kinases did not affect the DNA-binding activity of Jun homodimers or Fos-Jun heterodimers. Comparison of the DNA binding and in vitro transcription properties of wild-type and mutated proteins containing either alanine or aspartic acid residues in place of Ser-63, -73, and -246 revealed only minor differences among homodimeric complexes and no differences among Fos-Jun heterodimers. Thus, phosphorylation of Jun did not produce a significant change in dimerization, DNA-binding, or in vitro transcription activity. The regulatory role of phosphorylation in the modulation of Jun function is likely to be considerably more complex than previously suggested.

Related Genes
c-jun
MeSH Terms
Blood CDC2 Protein Kinase/metabolism Calcium-Calmodulin-Dependent Protein Kinases Casein Kinases DNA/metabolism DNA Mutational Analysis Fibroblasts/metabolism Glycogen Synthase Kinases HeLa Cells Humans Phosphorylation Protein Binding Protein Kinase C/metabolism Protein Kinases/metabolism Proto-Oncogene Proteins c-jun/biosynthesis,metabolism Serine/metabolism Transcription, Genetic
Chemicals
Proto-Oncogene Proteins c-jun Serine DNA Protein Kinases Glycogen Synthase Kinases Casein Kinases Protein Kinase C Calcium-Calmodulin-Dependent Protein Kinases CDC2 Protein Kinase
Authors & Affiliations
7 authors, click to expand affiliations / ORCID
Baker S J
Department of Molecular Oncology and Virology, Roche Institute of Molecular Biology, Nutley, New Jersey 07110.
Kerppola T K
Luk D
Vandenberg M T
Marshak D R
Curran T
Abate C
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Article Info
Journal
Molecular and cellular biology
Abbr.
Mol Cell Biol
ISSN
0270-7306
DOI
10.1128/mcb.12.10.4694-4705.1992
Published
1992-10-00
Pages
4694-705
Language
English
Region
United States
NLM ID
8109087
PMCID
PMC360396
Subset
IM
Grants
NCI NIH HHS · CA 13106 · United States
External Links
PubMed source DOI: 10.1128/mcb.12.10.4694-4705.1992 PMC Full Text View journal details
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