Kinetic regularities and a possible mechanism of ATP non-enzymatic hydrolysis induced by calix[4]arene С-107

Abstract

The kinetic model of calix[4]arene-induced ATP hydrolysis was elaborated. It is assumed that calix[4]­arene С-107 molecules form a complex with nucleoside triphosphate, ensuring the release of inorganic phosphate Рі, and then switch into an inactive state. Inactive calix[4]arene molecules are no longer able to form a complex with ATP and, accordingly, to provide hydrolysis of nucleoside triphosphate. In the author’s experimental studies, it was possible to explain the kinetic properties of the reaction, namely: the insignificant output of the reaction end product Pi; the quantitative regularities of the plateau (time-wise) accumulation of the reaction product when the concentration of calix[4]arene C-107 or ATP changes; the reciprocal dependence of the ATP half conversion on its concentration; the correspondence of the initial reaction rate dependence on the calix[4]arene and ATP concentration to the Michaelis-Menten equation. The final decision regarding the molecular mechanism of calix[4]arene-induced ATP hydrolysis requires further experimental and theoretical studies. Keywords: calixarenes, empirical kinetic analysis, hydrolysis of ATP