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Understanding protein diffusion on force-induced stretched DNA conformation.

Anupam Mondal1, Arnab Bhattacherjee1

  • 1School of Computational and Integrative Sciences, Jawaharlal Nehru University, New Delhi, India.

Frontiers in Molecular Biosciences
|December 22, 2022
PubMed
Summary

Stretched DNA forms stable base triplets, which DNA-binding proteins favor, enhancing DNA recognition and gene regulation. This study reveals how DNA structure changes influence protein interactions and function.

Keywords:
DNA stretchingS-DNAfacilitated diffusionprotein−DNA interactionstriplet formationΣ-DNA

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Area of Science:

  • Biophysics
  • Molecular Biology
  • Computational Biology

Background:

  • DNA conformation changes under mechanical forces, impacting its function.
  • Stretched DNA can adopt a Σ-DNA conformation with base triplets.
  • The role of DNA base triplets in protein recognition and genetic code remains unclear.

Purpose of the Study:

  • To investigate the mechanism of DNA base triplet formation under force.
  • To understand how DNA-binding proteins interact with stretched DNA and its triplets.
  • To elucidate the functional implications of DNA triplet formation on protein binding and diffusion.

Main Methods:

  • Coarse-grained molecular dynamics simulations.
  • Applying constant forces to stretch DNA.
  • Analyzing protein diffusion and binding on force-induced DNA conformations.

Main Results:

  • DNA transitions from B-DNA to S-DNA via Σ-DNA under stretching, forming base clusters.
  • DNA base triplets are energetically more stable than doublets or quadruplets.
  • Proteins favor triplet formation, which stabilizes protein-DNA interactions and enhances base recognition.

Conclusions:

  • DNA base triplet formation is a key mechanism in force-induced DNA structures.
  • Protein interaction with DNA triplets regulates binding energy landscapes and recognition efficiency.
  • Triplet formation is significant for facilitated protein diffusion and gene regulation.