Abstract
Abstract: Calcineurin dephosphorylated microtubule‐associated protein 2 (MAP2) and τ factor phosphorylated by cyclic AMP‐dependent and Ca2+, calmodulin‐dependent protein kinases from the brain. Tubulin, only phosphorylated by the Ca2+, calmodulin‐dependent protein kinase, served as substrate for calcineurin. The concentrations of calmodulin required to give half‐maximal activation of calcineurin were 21 and 16 nM with MAP2 and τ factor as substrates, respectively. The Km and Vmaxvalues were in ranges of 1–3 μM and 0.4–1.7 μmol/mg/ min, respectively, for MAP2 and τ factor. The Km value for tubulin was in a similar range, but the Vmax value was lower. The peptide map analysis revealed that calcineurin dephosphorylated MAP2 and τ factor universally, but not in a site‐specific manner. The autophosphorylated Ca2+, calmodulin‐dependent protein kinase was not dephosphorylated by calcineurin. These results suggest that calcineurin plays an important role in the functions of microtubules via dephosphorylation.
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Dates
Type | When |
---|---|
Created | 18 years, 10 months ago (Oct. 5, 2006, 1:06 p.m.) |
Deposited | 1 year, 10 months ago (Oct. 20, 2023, 12:33 p.m.) |
Indexed | 1 week, 5 days ago (Aug. 19, 2025, 7:11 a.m.) |
Issued | 40 years, 1 month ago (July 1, 1985) |
Published | 40 years, 1 month ago (July 1, 1985) |
Published Online | 18 years, 10 months ago (Oct. 5, 2006) |
Published Print | 40 years, 1 month ago (July 1, 1985) |
@article{Goto_1985, title={Dephosphorylation of Microtubule‐Associated Protein 2, τ Factor, and Tubulin by Calcineurin}, volume={45}, ISSN={1471-4159}, url={http://dx.doi.org/10.1111/j.1471-4159.1985.tb05504.x}, DOI={10.1111/j.1471-4159.1985.tb05504.x}, number={1}, journal={Journal of Neurochemistry}, publisher={Wiley}, author={Goto, Satoshi and Yamamoto, Hideyuki and Fukunaga, Kohji and Iwasa, Takafumi and Matsukado, Yasuhiko and Miyamoto, Eishichi}, year={1985}, month=jul, pages={276–283} }