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  • Title: [Effect of staphylococcus active substances on ATPase activity of smooth muscle actomyosin and myosin].
    Author: Davydovs'ka TL, Tsymbaliuk OV, Danylova VM, Miroshnychenko MS, Kholodna LS, Posur VK.
    Journal: Ukr Biokhim Zh (1999); 2001; 73(4):24-8. PubMed ID: 12035523.
    Abstract:
    The effect of staphylococcus active substances--protein A (PA) and peptidoglican (PG) at concentrations 10(-6)-10(-2) mg/ml on the ATPase activity of pig stomach natural actomyosin and myosin was studied. It was shown that PA and PG at direct contact with smooth muscle contractile proteins caused the activation and inhibition of ATPase activity, respectively. On the basis of this investigation it was assumed that staphylococcal active substances were able to modify of the ATPase activity smooth muscle contractile proteins perhaps via direct action on the myosin molecule, which could be accompanied by conformational changes of the active center of myosin ATPase.
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