Divalents hydrolysis affected

Possible modes of regulation of filament assembly may be anticipated from the basic properties of actin. We have shown that the tightly bound divalent metal ion (Ca or Mg ) interacts with the P- and y-phosphates of ATP bound to actin, and that the Me-ATP bidentate chelate is bound to G-actin in the A configuration. The nature of the bound metal ion affects the conformation of actin, the binding kinetics of ATP and ADP, and the rate of ATP hydrolysis. 

The alkaline hydrolysis of 1,lO-phenanthroline-2-carbonyl phosphate is affected markedly by the presence of divalent metal ions Cu(II), Ni(II), Co(II), and Zn(II) can each increase the... 

The presence of calcium ion also affects the power-law index. Figure 12 shows that higher power-law index values were obtained with the calcium ion, i.e., divalent ions enhance Newtonian behavior. It should be mentioned that there was no phase separation due to the presence of the calcium ion [9,55]. This is presumably due to the temperature (20°C) and the degree of hydrolysis of the polymer examined (0.28). 

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