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Facilitation of DNA loop formation by protein–DNA non-specific interactions

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Abstract

Complex DNA topological structures, including polymer loops, are frequently observed in biological processes when protein molecules simultaneously bind to several distant sites on DNA. However, the molecular mechanisms of formation of these systems remain not well understood. Existing theoretical studies focus only on specific interactions between protein and DNA molecules at target sequences. However, the electrostatic origin of primary protein–DNA interactions suggests that interactions of proteins with all DNA segments should be considered. Here we theoretically investigate the role of non-specific interactions between protein and DNA molecules on the dynamics of loop formation. Our approach is based on analyzing a discrete-state stochastic model via a method of first-passage probabilities supplemented by Monte Carlo computer simulations. It is found that depending on a protein sliding length during the non-specific binding event three different dynamic regimes of the DNA loop formation might be observed. In addition, the loop formation time might be optimized by varying the protein sliding length, the size of the DNA molecule, and the position of the specific target sequences on DNA. Our results demonstrate the importance of non-specific protein–DNA interactions in the dynamics of DNA loop formations.

Graphical abstract: Facilitation of DNA loop formation by protein–DNA non-specific interactions

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Publication details

The article was received on 02 Apr 2019, accepted on 07 Jun 2019 and first published on 10 Jun 2019


Article type: Paper
DOI: 10.1039/C9SM00671K
Soft Matter, 2019, Advance Article

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    Facilitation of DNA loop formation by protein–DNA non-specific interactions

    J. Shin and A. B. Kolomeisky, Soft Matter, 2019, Advance Article , DOI: 10.1039/C9SM00671K

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