Acceleration of bursty multiprotein target search kinetics on DNA by colocalisation

Literature Information

Publication Date 2017-12-20
DOI 10.1039/C7CP06922G
Impact Factor 3.676
Authors

Andrey G. Cherstvy, Ralf Metzler


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Abstract

Proteins are capable of locating specific targets on DNA by employing a facilitated diffusion process with intermittent 1D and 3D search steps. Gene colocalisation and coregulation—i.e. the spatial proximity of two communicating genes—is one factor capable of accelerating the target search process along the DNA. We perform Monte Carlo computer simulations and demonstrate the benefits of gene colocalisation for minimising the search time in a model DNA–protein system. We use a simple diffusion model to mimic the search for targets by proteins, produced initially in bursts of multiple proteins and performing the first-passage search on the DNA chain. The behaviour of the mean first-passage times to the target is studied as a function of distance between the initial position of proteins and the DNA target position, as well as versus the concentration of proteins. We also examine the properties of bursty target search kinetics for varying physical–chemical protein–DNA binding affinity. Our findings underline the relevance of colocalisation of production and binding sites for protein search inside biological cells.

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Physical Chemistry Chemical Physics

Physical Chemistry Chemical Physics
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