Summary
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1.
Microtubules prepared from pig brain by two cycles of assembly-disassembly comprise cyclic nucleotide-independent protein kinase activity with phosvitin and troponin T as substrates.
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2.
Phosphocellulose chromatography resolved two phosvitin kinase activity peaks, one of which coincided with the troponin T kinase peak.
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3.
The activity peak corresponding to troponin T kinase was inhibited by heparin (I 50 = 0.06µg/ml), whereas the other phosvitin kinase peak was unaffected.
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4.
Both kinase fractions phosphorylated tubulin and microtubule-associated protein (MAP-2).
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5.
It is concluded that pig brain microtubules contain bound casein kinases I and II. The association may target the action of these kinases toward microtubular proteinsin vivo.
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Risnik, V.V., Ádám, G., Gusev, N.B. et al. Casein kinases I and II bound to pig brain microtubules. Cell Mol Neurobiol 8, 315–324 (1988). https://doi.org/10.1007/BF00711173
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DOI: https://doi.org/10.1007/BF00711173