Two yeast genes encoding calmodulin-dependent protein kinases. Isolation, sequencing and bacterial expressions of CMK1 and CMK2 - PubMed (original) (raw)
. 1991 Jul 5;266(19):12784-94.
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- PMID: 2061341
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Two yeast genes encoding calmodulin-dependent protein kinases. Isolation, sequencing and bacterial expressions of CMK1 and CMK2
Y Ohya et al. J Biol Chem. 1991.
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Abstract
We have isolated two genes from Saccharomyces cerevisiae that both encode a calmodulin-dependent protein kinase (CaM kinase). The CMK1 gene has been cloned by hybridization using an oligonucleotide probe synthesized on the basis of the peptide sequence of purified yeast CaM kinase (Londesborough, J. (1989) J. Gen. Microbiol. 135, 3373-3383). The other gene, CMK2, which is homologous to CMK1, has been isolated by screening at low stringency with a CMK1 fragment as a probe. The CMK2 product expressed in bacteria shows Ca(2+)- and CaM-dependent protein kinase activity, indicating that CMK2 also encodes a CaM kinase. The CMK1 and CMK2 products expressed in bacteria were found to have different biochemical properties in terms of autoregulatory activity and preference for yeast CaM or bovine CaM for maximal activity. Antibody raised against a peptide fragment of the CMK1 protein cross-reacts with the CMK2 product. Immunoblotting with this antibody indicated that the CMK1 and CMK2 products have apparent molecular masses of 56 and 50 kDa, respectively, in yeast cells. The predicted amino acid sequences of the two CMK products exhibit highest similarity with mammalian calmodulin-dependent multifunctional protein kinase II (CaM kinase II): the similarity within the N-terminal catalytic domain is about 40%, whereas that within the rest of the sequence is 25%. These data indicate that yeast has two kinds of genes encoding CaM kinase isozymes whose structural and functional properties are closely related to those of mammalian CaM kinase II. Another gene may be substituted for function of the CMK1 and CMK2 kinase in vivo, since elimination of both kinase genes is not lethal.
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