Effect of okadaic acid on phosphorylation-dephosphorylation of myosin light chain in aortic smooth muscle homogenate

Ferenc Erdodi, Anikó Rokolya, Joseph Di Salvo, Michael Bárány, Kate Bárány

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Myosin light chain phosphorylation in aortic smooth muscle homogenate reached a maximal level of 0.75 mol phosphate/mol light chain, and then declined. Addition of okadaic acid led to a sustained phosphorylation level of 1.7 mol/mol. In the absence of okadaic acid, phosphorylation was predominantly due to myosin light chain kinase, whereas in the presence of okadaic acid both myosin light chain kinase and protein kinase C were involved in phosphorylation. Okadaic acid inhibited dephosphorylation of the distinct sites in LC phosphorylated by either myosin light chain kinase or protein kinase C, suggesting that it exerts its effect through inhibition of myosin light chain phosphatases present in aortic homogenate.

Original languageEnglish
Pages (from-to)156-161
Number of pages6
JournalBiochemical and Biophysical Research Communications
Issue number1
Publication statusPublished - May 31 1988


ASJC Scopus subject areas

  • Biophysics
  • Biochemistry
  • Molecular Biology
  • Cell Biology

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