Characterization of a Ca2+/calmodulin-dependent protein kinase cascade

Molecular cloning and expression of calcium/calmodulin-dependent protein kinase kinase

Hiroshi Tokumitsu, Hervé Enslen, Thomas R. Soderling

Research output: Contribution to journalArticle

191 Citations (Scopus)

Abstract

Recent studies have demonstrated that Ca2+/calmodulin-dependent protein kinase IV (CaM-kinase IV) can mediate Ca2+-dependent regulation of gene expression through the phosphorylation of transcriptional activating proteins. We have previously identified and purified a 68-kDa rat brain CaM-kinase kinase that phosphorylates and increases total and Ca2+-independent activities of CaM-kinase IV (Tokumitsu, H., Brickey, D. A., Gold, J., Hidaka, H., Sikela, J., and Soderling, T. R. (1994) J. Biol. Chem. 269, 28640-28647). Using a partial amino acid sequence of the purified brain kinase, a CaM-kinase kinase cDNA was cloned from a rat brain cDNA library. Northern blot analysis showed that CaM-kinase kinase mRNA (3.4 kilobases) was expressed in rat brain, thymus, and spleen. Sequence analyses revealed that the cDNA encoded a 505-amino acid protein, which contained consensus protein kinase motifs and was 30-40% homologous with members of the CaM-kinase family. Expression of the cDNA in COS-7 cells yielded an apparent 68-kDa CaM-binding protein, which catalyzed in vitro activation in the presence of Mg2+/ATP and Ca2+/ CaM of CaM-kinases I and IV but not of CaM-kinase II. Co-expression of CaM-kinase kinase with CaM-kinase IV gave a 14-fold enhancement of cAMP-response elementbinding protein-dependent gene expression compared with CaM-kinase IV alone. These results are consistent with the hypothesis that CaM-kinases I and IV are regulated through a unique signal transduction cascade involving CaM-kinase kinase.

Original languageEnglish
Pages (from-to)19320-19324
Number of pages5
JournalJournal of Biological Chemistry
Volume270
Issue number33
Publication statusPublished - Aug 18 1995
Externally publishedYes

Fingerprint

Calcium-Calmodulin-Dependent Protein Kinase Kinase
Calcium-Calmodulin-Dependent Protein Kinases
Cloning
Molecular Cloning
Calcium-Calmodulin-Dependent Protein Kinase Type 4
Phosphotransferases
Calcium-Calmodulin-Dependent Protein Kinase Type 1
Brain
Rats
Complementary DNA
Gene expression
Amino Acids
Thymus
Calcium-Calmodulin-Dependent Protein Kinase Type 2
Signal transduction
Amino Acid Motifs
Phosphorylation
Proteins
COS Cells
Gene Expression Regulation

ASJC Scopus subject areas

  • Biochemistry

Cite this

Characterization of a Ca2+/calmodulin-dependent protein kinase cascade : Molecular cloning and expression of calcium/calmodulin-dependent protein kinase kinase. / Tokumitsu, Hiroshi; Enslen, Hervé; Soderling, Thomas R.

In: Journal of Biological Chemistry, Vol. 270, No. 33, 18.08.1995, p. 19320-19324.

Research output: Contribution to journalArticle

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