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Stability analysis of the Michaelis-Menten approximation of a mixed mechanism of a phosphorylation system. (English) Zbl 1392.92035
Summary: In this paper, we consider a mixed mechanism of a \(\mathrm{n}\)-site phosphorylation system in which the mechanism of phosphorylation is distributive and that of dephosphorylation is processive. It is assumed that the concentrations of the substrates are much higher than those of the enzymes and their intermediate complexes. This assumption enables us to reduce the system using the steady-state approach to a Michaelis-Menten approximation of the system. It is proved that the resulting system of nonlinear ordinary differential equations admits a unique positive equilibrium in every positive stoichiometric compatibility class using the theory of quadratic equations. We then consider two special cases. In the first case, we assume that the Michaelis constants associated with the different substrates in the phosphorylation reactions are equal and construct a Lyapunov function to prove asymptotic stability of the system. In the second case, we assume that there are just two sites of phosphorylation and dephoshorylation and prove that the resulting system is asymptotically stable using Poincaré Bendixson theorem.

92C45 Kinetics in biochemical problems (pharmacokinetics, enzyme kinetics, etc.)
37B25 Stability of topological dynamical systems
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