title: Stochastic transitions in a bistable reaction system on the membrane.
abstract: Transitions between steady states of a multi-stable stochastic system in the perfectly mixed chemical reactor are possible only because of stochastic switching. In realistic cellular conditions, where diffusion is limited, transitions between steady states can also follow from the propagation of travelling waves. Here, we study the interplay between the two modes of transition for a prototype bistable system of kinase-phosphatase interactions on the plasma membrane. Within microscopic kinetic Monte Carlo simulations on the hexagonal lattice, we observed that for finite diffusion the behaviour of the spatially extended system differs qualitatively from the behaviour of the same system in the well-mixed regime. Even when a small isolated subcompartment remains mostly inactive, the chemical travelling wave may propagate, leading to the activation of a larger compartment. The activating wave can be induced after a small subdomain is activated as a result of a stochastic fluctuation. Such a spontaneous onset of activity is radically more probable in subdomains characterized by slower diffusion. Our results show that a local immobilization of substrates can lead to the global activation of membrane proteins by the mechanism that involves stochastic fluctuations followed by the propagation of a semi-deterministic travelling wave.
authors: Institute of Fundamental Technological Research, Polish Academy of Sciences, Warsaw, Poland.
authors: Marek
authors: M
authors: Kochanczyk
authors: Joanna
authors: J
authors: Jaruszewicz
authors: Tomasz
authors: T
authors: Lipniacki
mesh_terms: D002462:Cell Membrane / Q000378:metabolism*; D019781:Corneal Topography; D006706:Homeostasis / Q000502:physiology*; D008390:Markov Chains; D008956:Models, Chemical; D056004:Molecular Dynamics Simulation; D009010:Monte Carlo Method; D010744:Phosphoric Monoester Hydrolases / Q000378:metabolism*; D010770:Phosphotransferases / Q000378:metabolism*
chemical_list: D010770:Phosphotransferases; D010744:Phosphoric Monoester Hydrolases
keywords: Markov process; cell signalling; kinase autophosphorylation; kinetic Monte Carlo on the lattice; multi-stability; spatially extended system
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