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| Content Provider | World Health Organization (WHO)-Global Index Medicus |
|---|---|
| Author | Goldenring, J. R. Buckholz, T. M. Larson, R. E. Delorenzo, R. J. Vallano, M. L. |
| Abstract | Both cAMP- and calmodulin-dependent kinases are proposed regulators of microtubule function by means of their ability to phosphorylate microtubule-associated protein 2(MAP 2). A cAMP-dependent kinase/MAP 2 complex is endogenous to microtubules. In this report, we demonstrate that an endogenous calmodulin-dependent kinase that phosphorylates MAP 2 as a major substrate is also present in microtubules prepared under conditions that preserve kinase activity. This enzyme is identical to a calmodulin-dependent kinase purified previously from rat brain cytosol. A fraction containing calmodulin-dependent kinase and MAP 2 was separated from the cAMP-dependent kinase/MAP 2 complex by gel filtration chromatography of microtubule protein in high ionic strength buffer. All of the recovered calmodulin-dependent kinase activity in microtubules eluted in a single protein peak. The specific activity of the enzyme for MAP 2 was enriched 31-fold in this fraction compared to cytosol. Two-dimensional tryptic phosphopeptide mapping revealed that the endogenous cAMP- and calmodulin-dependent kinases phosphorylated distinct sites on MAP 2. These data demonstrate that both kinases are present in microtubule preparations and that they may differentially regulate MAP 2 function by phosphorylating separate sites on MAP 2. |
| ISSN | 00278424 |
| e-ISSN | 10916490 |
| Journal | Proceedings of the National Academy of Sciences of the United States of America |
| Issue Number | 10 |
| Volume Number | 82 |
| Language | English |
| Publisher | National Academy of Sciences |
| Publisher Date | 1985-06-01 |
| Publisher Place | United States |
| Access Restriction | Open |
| Subject Keyword | Calmodulin Metabolism Microtubule-Associated Proteins Microtubules Enzymology Protein Kinases Isolation & Purification Animals Brain Macromolecular Substances Peptide Fragments Phosphoproteins Phosphorylation Research Support, U.S. Gov't, Non-P.H.S. Research Support, U.S. Gov't, P.H.S. Multidisciplinary |
| Content Type | Text |
| Resource Type | Article |
| Subject | Multidisciplinary |
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