Journal
FEBS LETTERS
Volume 579, Issue 29, Pages 6611-6615Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.febslet.2005.10.055
Keywords
myosin target subunit; myosin phosphatase; rhokinase; type 1 phosphatase; A7r5 cells; lysophosphatidic acid
Funding
- NHLBI NIH HHS [HL23615] Funding Source: Medline
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Major sites for Rho-kinase on the myosin phosphatase target subunit (MYPT1) are Thr695 and Thr850. Phosphorylation of Thr695 inhibits phosphatase activity but the role of phosphorylation at Thr850 is not clear and is evaluated here. Phosphorylation of both Thr695 and Thr850 by Rho-kinase inhibited activity of the type I phosphatase catalytic subunit. Rates of phosphorylation of the two sites were similar and efficacy of inhibition following phosphorylation was equivalent for each site. Phosphorylation of each site on MYPT1 was detected in A7r5 cells, but Thr850 was preferred by Rho-kinase and Thr695 was phosphorylated by an unidentified kinase(s). (c) 2005 Federation of European Biochemical Societies. Published by Elsevier B.V. All rights reserved.
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