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. 2004 Sep;30(3):203–226. doi: 10.1023/B:JOBP.0000046728.51620.14

A Model of Sequence-Dependent Protein Diffusion Along DNA

Maria Barbi 1,2, Christophe Place 3, Vladislav Popkov 4,5, Mario Salerno 1
PMCID: PMC3456087  PMID: 23345869

Abstract

We introduce a probabilistic model for protein sliding motion along DNA during the search of a target sequence. The model accounts for possible effects due to sequence-dependent interaction between the nonspecific DNA and the protein. Hydrogen bonds formed at the target site are used as the main sequence-dependent interaction between protein and DNA. The resulting dynamical properties and the possibility of an experimental verification are discussed in details. We show that, while at large times the process reaches a linear diffusion regime, it initially displays a sub-diffusive behavior. The sub-diffusive regime can last sufficiently long to be of biological interest.

Keywords: anomalous diffusion, DNA-protein interaction, dynamical models, sliding, target site

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