Interactions of calcium and native tropomyosin with myosin and heavy meromyosin.

@article{Kominz1966InteractionsOC,
  title={Interactions of calcium and native tropomyosin with myosin and heavy meromyosin.},
  author={D. R. Kominz},
  journal={Archives of biochemistry and biophysics},
  year={1966},
  volume={115 3},
  pages={
          583-92
        }
}
Abstract It is confirmed that the presence of native tropomyosin is required in order for the removal of Ca ++ to cause inhibition of the Mg ++ -activated ATPase of actomyosin and acto-heavy-meromyosin. Native tropomyosin is present in routinely purified samples of myosin at levels of 0.7–2.3%; such quantities inhibit the actomyosin ATPase by 30–60% upon removal of Ca ++ . Titration with mercurial at low ionic strength causes a loss of actomyosin ATPase; it causes an even greater loss of the… CONTINUE READING

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