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Issue 12, 2018
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Acceleration of bursty multiprotein target search kinetics on DNA by colocalisation

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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.

Graphical abstract: Acceleration of bursty multiprotein target search kinetics on DNA by colocalisation

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Publication details

The article was received on 10 Oct 2017, accepted on 20 Dec 2017 and first published on 20 Dec 2017


Article type: Paper
DOI: 10.1039/C7CP06922G
Citation: Phys. Chem. Chem. Phys., 2018,20, 7931-7946
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    Acceleration of bursty multiprotein target search kinetics on DNA by colocalisation

    P. Kar, A. G. Cherstvy and R. Metzler, Phys. Chem. Chem. Phys., 2018, 20, 7931
    DOI: 10.1039/C7CP06922G

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