Importance of model size in quantum mechanical studies of DNA intercalation.
Drew P HardingLaura J KingsleyGlen SpraggonSteven E WheelerPublished in: Journal of computational chemistry (2020)
The convergence of DFT-computed interaction energies with increasing binding site model size was assessed. The data show that while accurate intercalator interaction energies can be derived from binding site models featuring only the flanking nucleotides for uncharged intercalators that bind parallel to the DNA base pairs, errors remain significant even when including distant nucleotides for intercalators that are charged, exhibit groove-binding tails that engage in noncovalent interactions with distant nucleotides, or that bind perpendicular to the DNA base pairs. Consequently, binding site models that include at least three adjacent nucleotides are required to consistently predict converged binding energies. The computationally inexpensive HF-3c method is shown to provide reliable interaction energies and can be routinely applied to such large models.
Keyphrases
- density functional theory
- circulating tumor
- molecular dynamics
- cell free
- single molecule
- lymph node
- nucleic acid
- high resolution
- heart failure
- big data
- magnetic resonance imaging
- binding protein
- patient safety
- mass spectrometry
- magnetic resonance
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- deep learning
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