Ca2+/calmodulin-dependent protein kinase enriched in cerebellar granule cells. Identification of a novel neuronal calmodulin-dependent protein kinase - PubMed (original) (raw)
. 1989 Apr 5;264(10):5866-75.
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- PMID: 2538431
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Ca2+/calmodulin-dependent protein kinase enriched in cerebellar granule cells. Identification of a novel neuronal calmodulin-dependent protein kinase
C A Ohmstede et al. J Biol Chem. 1989.
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Abstract
Ca2+-sensitive protein kinases are thought to play a pivotal role in Ca2+-mediated neuronal communication. We describe here the cloning, purification, and characterization of a major Ca2+/calmodulin-dependent, brain-specific protein kinase which is particularly enriched in cerebellar granule cells. The enzyme is comprised of Mr 65,000 and 67,000 polypeptides which copurify to homogeneity and phosphorylate synapsin I. The protein kinase is coded for by two poly(A+) RNAs of 2.0 and 3.5 kilobases which probably derive from a single gene. Two cDNA inserts, one of 198 base pairs and one of 1225 base pairs, contain a total of 677 base pairs of the protein coding sequence which includes sequences homologous to other calmodulin-dependent protein kinases including part of the calmodulin-binding domain. The surprising presence of extended sequences which are enriched in glutamate residues may influence the subcellular distribution of this kinase. Immunohistochemical localization with an affinity-purified antibody reveals that whereas the enzyme is expressed in several neuronal subpopulations, it is exceptionally enriched in the granule cells of the cerebellum. The relevance of the biochemical, molecular, and histologic properties of this enzyme is discussed in the context of neuronal Ca2+ signaling.
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