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Related Experiment Video

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Quantum tunneling in DNA methylation: A computational study using QM/MM and molecular dynamics.

Justin Sato1, Annabelle Choi1, Peace U Clement2

  • 1California Academy of Math and Science, Carson, CA, USA; Department of Physics, California State University Dominguez Hills, Carson, CA, USA.

Biophysical Journal
|April 23, 2026
PubMed
Summary

Quantum tunneling significantly contributes to DNA methylation by DNA methyltransferases (DNMTs). Computational studies reveal DNMT1 reshapes the reaction barrier, enabling methyl tunneling and influencing gene expression and disease progression.

Keywords:
DNA methylationQM/MMepigeneticskinetic isotope effectmolecular dynamicsquantum chemistryquantum tunneling

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Area of Science:

  • Biochemistry
  • Computational Chemistry
  • Epigenetics

Background:

  • DNA methylation is a key epigenetic mechanism regulating gene expression and chromatin structure.
  • While often viewed as thermally driven, quantum tunneling's role in methyl transfer by DNA methyltransferases (DNMTs) is increasingly recognized.
  • Understanding these mechanisms is crucial for comprehending gene regulation and disease development.

Purpose of the Study:

  • To investigate the contribution of quantum mechanical tunneling to the methyl transfer reaction catalyzed by DNMTs.
  • To employ multiscale computational methods to model the tunneling process within the enzymatic environment.
  • To quantify the impact of tunneling on reaction rates and kinetic isotope effects (KIEs).

Main Methods:

  • Utilized a multiscale computational approach combining density functional theory (DFT), QM/MM, and advanced tunneling formalisms (WKB and Ring Polymer Instanton theory).
  • Applied Wentzel-Kramers-Brillouin (WKB) analysis as a baseline and Ring Polymer Instanton (RPI) theory with instanton-Hessian refinement for accurate tunneling calculations.
  • Analyzed enzyme-aligned reaction coordinates, including Morse potential fits, to extract barrier properties and interpret tunneling dynamics.

Main Results:

  • WKB analysis showed negligible tunneling without enzymatic influence, highlighting the necessity of the catalytic environment.
  • Instanton + Hessian analysis for DNMT1 predicted a large KIE (≈ 8.17×10^3) for the pre-methylation state, indicating significant tunneling.
  • RPI calculations for the methylated state yielded a modest KIE (≈ 6.28-6.32), suggesting suppressed isotope sensitivity post-methylation.

Conclusions:

  • DNMT1 actively reshapes the reaction barrier to facilitate methyl group tunneling during the chemical step.
  • The enzyme's catalytic environment is essential for enabling significant quantum tunneling in DNA methylation.
  • Product-like geometries appear to reduce the sensitivity of the reaction rate to isotopic substitution after methylation.