Quantum Chemical Dynamics of Nucleic Acid Interactions

The dynamic interplay of nucleic acids at the quantum level underpins fundamental biological processes such as replication fidelity, mutation rates and molecular recognition. Quantum chemical dynamics leverages both electronic structure theory and nuclear motion to resolve proton transfer events, tautomerisation equilibria and hydrogen-bond rearrangements within DNA and RNA. By modelling reaction pathways on multidimensional free energy surfaces and incorporating quantum tunnelling and nuclear quantum effects, researchers can predict rare tautomer populations and their contributions to point mutations. These insights extend to synthetic systems, shedding light on non-canonical base pairing and informing the design of modified nucleic acids. The integration of mixed quantum mechanics/molecular mechanics (QM/MM) schemes, advanced sampling techniques and machine learning corrections has markedly enhanced both the accuracy and temporal reach of simulations.

Research from Nature Portfolio

Recent studies have employed an open quantum systems framework to investigate proton dynamics in guanine–cytosine base pairs. By modelling the dissipative environment and decoherence effects, these investigations have demonstrated that quantum tunnelling contributes orders of magnitude more to proton transfer rates than classical over-barrier hopping. This approach predicts tautomeric occupation probabilities higher than previously assumed, with implications for DNA mutation models.

Complementary work has introduced direct computational Arrhenius plots for nucleic acid reactions in aqueous solution. By simulating temperature-dependent free energy profiles using empirical valence bond models calibrated to quantum mechanical data, researchers have dissected activation enthalpies and entropies for base-pair deamination mechanisms. This methodology offers a robust route to distinguish mechanistic pathways and rationalise reaction kinetics in a biological context.

Quantum Chemical Dynamics of Nucleic Acid Interactions publication trend

The graph below shows the total number of articles in quantum chemical dynamics of nucleic acid interactions across all publications each year (not limited to Nature Index journals).

Technical terms

Quantum tunnelling: Particle passage through a potential barrier due to its wave-like quantum nature.

Tautomerisation: Proton-transfer-driven interconversion of nucleobase isomers with distinct hydrogen-bonding patterns.

Free energy surface: Multidimensional landscape describing the energy of a system as reaction coordinates vary.

QM/MM simulation: Hybrid computational method coupling quantum mechanical treatment of a reactive region with classical molecular mechanics for the environment.

Density functional theory (DFT): Quantum chemical approach that approximates electronic structure via electron density functionals.

Path integral molecular dynamics: Technique incorporating quantum nuclear effects by representing particles as ring polymers in simulation.

References

1. An open quantum systems approach to proton tunnelling in DNA. Communications Physics (2022).
2. Chemical reaction mechanisms in solution from brute force computational Arrhenius plots. Nature Communications (2015).
3. Electronic and Nuclear Quantum Effects on Proton Transfer Reactions of Guanine–Thymine (G-T) Mispairs Using Combined Quantum Mechanical/Molecular Mechanical and Machine Learning Potentials. Molecules (2024).
4. How proton transfer impacts hachimoji DNA. RSC Advances (2023).