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| Content Provider | World Health Organization (WHO)-Global Index Medicus |
|---|---|
| Author | Dedman, J. R. Marcum, J. M. Brinkley, B. R. Means, A. R. |
| Abstract | The Ca2+-dependent regulator (CDR) protein of cyclic nucleotide phosphodiesterase is a low molecular weight, acidic, Ca2+-binding protein which has been implicated in a number of Ca2+-dependent enzymatic functions. Indirect immunofluorescence has revealed that CDR is specifically associated with the chromosome-to-pole region of the mitotic apparatus during metaphase-anaphase in a pattern distinctly different from that of similar cultured cells stained with antitubulin. This characteristic localization in the mitotic half-spindle suggested a role for CDR in the control of microtubule assembly-disassembly during mitosis. Thus, CDR was examined for its effects on microtubule polymerization in vitro. It was determined that stoichiometric concentrations of CDR and a homologous Ca2+-binding protein, skeletal muscle troponin C, both inhibited and reversed microtubule assembly in a Ca2+-dependent manner. CDR-dependent inhibition of in vitro microtubule assembly occurred at physiological Ca2+ concentrations (approximately 10 micron) that, in the absence of CDR, caused only a slight reduction in polymerization. At Ca2+ concentrations in the low physiological range (less than 1 micron), no inhibition was observed. These biochemical results, together with the immunofluorescent localization of CDR in the mitotic half-spindle, provide evidence that Ca2+ is an endogenous regulator of microtubule disassembly through the activity of CDR. |
| ISSN | 00278424 |
| e-ISSN | 10916490 |
| Journal | Proceedings of the National Academy of Sciences of the United States of America |
| Issue Number | 8 |
| Volume Number | 75 |
| Language | English |
| Publisher | National Academy of Sciences |
| Publisher Date | 1978-12-01 |
| Publisher Place | United States |
| Access Restriction | Open |
| Subject Keyword | 2',3'-Cyclic-Nucleotide Phosphodiesterases Metabolism Calmodulin Pharmacology Carrier Proteins Microtubules Phosphoric Diester Hydrolases Animals Calcium In Vitro Techniques Mitosis Parvalbumins Troponin Research Support, U.S. Gov't, P.H.S. Multidisciplinary |
| Content Type | Text |
| Resource Type | Article |
| Subject | Multidisciplinary |
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