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  • Title: [Effect of inhibitors of energy-dependent Ca2+-transporting systems on ATP-hydrolase activity of smooth muscle actomyosin].
    Author: Kosterin SA, Taran TT, Zimina VP.
    Journal: Ukr Biokhim Zh (1999); 2001; 73(2):57-62. PubMed ID: 11642046.
    Abstract:
    Comparative investigation of of smooth muscle actomyosine ATP-ase sensitivity to some inhibitors of energy-dependent Ca(2+)-transporting systems has been carried out. It is proved that the ATP-ase of actomyosine is nonselectively inhibited by thapsigargin (imaginary inhibition constant Ki is equal 29.4 +/- 5.2 nM), cyclopiazonic acid (Ki = 626 +/- 118 nM), eosin Y (Ki = 70 +/- 14 nM) and p-chlormercurybenzoate (Ki = 380 +/- 151 nM). The data obtained could be used for the further development of the ideas about regularities of Ca(2+)-dependent control of the smooth muscles contraction-relaxation.
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