Abstract
The attractive stacking interaction between adjacent bases causes single strands to form helical stacks at low temperature, with this order being disrupted as the temperature increases. The literature is divided on both the nature of the attraction and the thermodynamics of the transition. The relative contributions of van der Waals, induced dipole, hydrophobic and permanent polar/electrostatic interactions remain unclear.
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Notes
- 1.
Bases were counted as stacked if their stacking interaction was less than \(-0.1\) reduced units, or approximately \(-0.60\)  kcal mol\(^{-1}\) (relative to a typical stacked interaction of \(-6\)  kcal mol\(^{-1}\)). Adjusting the cutoff to \(-1.2 \)  kcal mol\(^{-1}\) had a negligible effect.
- 2.
Simulations are performed in the canonical ensemble, and hence should be described in terms of energy and entropy changes. I assume that, as dilute DNA strands contribute a very small partial pressure, discrepancies between constant volume and constant pressure results are small: we therefore use the term ‘enthalpy’ to describe what are in fact energies in the model, for consistency with experimental literature.
- 3.
Averaging over the parameters of Ref. [20] gives an extremely convenient metric for comparison. An alternative approach (at least for the purposes of comparing \(T_m\)) would be to average over the \(T_m\) of all possible sequences. This second method gives results which are approximately 0.5Â K lower for a 5Â bp duplex and quickly converges on the first as duplex size increases.
- 4.
Simulations of duplexes with more than 12 bp necessitated using a larger periodic cell, and hence a lower concentration. The fraction of bound duplexes was scaled to the higher concentration assuming the separate species are approximately ideal, as justified in Chap. 4. Extrapolation to a range of temperatures was performed using single histogram re-weighting: the accuracy of such a method was checked for 8 bp duplexes, and no significant systematic errors were found.
- 5.
For example, if the melting transition of an 8-bp duplex was as wide as predicted by Ref. [20], one would expect the statistical weight of an 8-bp duplex in my model to be increased by around a factor of two at 341Â K. This is the approximate melting temperature of a hairpin with an 8-bp stem and a 6-base loop: increasing the statistical weight of the hairpin by a factor of two would translate into an increase in \(T_m\) of around 2Â K.
- 6.
Note that the experiments were performed in a range of concentrations of denaturing urea, then extrapolated to zero urea concentration.
- 7.
Hairpin stems contained 12Â bp and loops consisted of six bases. For each system, four VMMC simulations were performed for \(4 \times 10^{10}\) steps, using umbrella sampling to improve equilibration.
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Ouldridge, T.E. (2012). Thermodynamic Properties of Model DNA. In: Coarse-Grained Modelling of DNA and DNA Self-Assembly. Springer Theses. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-30517-7_6
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