RT info:eu-repo/semantics/article
T1 Improving the mesoscopic modeling of DNA denaturation dynamics
A1 Marty Roda, Marta
A1 Dahlen, Oda
A1 Erp, Titus S. van
A1 Cuesta López, Santiago
K1 Biomolecular dynamics
K1 DNA
K1 hairpins
K1 modelling
K1 PBD model
K1 rate constants
AB Although previously developed mesoscopic DNA models have successfully reproduced thermodynamic denaturation data, recent studies show that these overestimate the rate of denaturation by orders of magnitude. Using adapted Peyrard–Bishop–Dauxois (PBD) models, we have calculated the denaturation rates of several DNA hairpins and made comparison with experimental data. We show that the addition of a barrier at the onsite potential of the PBD model gives a more accurate description of the unzipping dynamics of short DNA sequences. The new models provide a refined theoretical insight on the dynamical mechanisms of unzipping which can have implications for the understanding of transcription and replication processes. Still, this class of adapted PBD models seems to have a fundamental limitation which implies that it is not possible to get agreement with available experimental results on the dynamics of long DNA sequences and at the same time maintain the good agreement regarding its thermodynamics. The reason for this is that the denaturation rate of long DNA chains is not dramatically lowered by the additional barrier—as the base-pairs that open are more likely to remain open, facilitating the opening of the full DNA molecule. Some care has to be taken, since experimental techniques suitable to the study of denaturation rates of long sequences seem not to agree with other experimental data on short DNA sequences. Further research, both theoretical and experimental, is therefore needed to resolve these inconsistencies—which will be a starting point for new minimalistic models that are able to describe both thermodynamics and dynamics at a predictive level.
PB IOP Publishing
SN 1478-3975
YR 2018
FD 2018-11
LK http://hdl.handle.net/10259/5719
UL http://hdl.handle.net/10259/5719
LA eng
NO Spanish Ministry of Economy, Industry and Competitiveness (BES-2013-065453, FIS2012-38827) and the University of Burgos and the Anders Jahre fund (Project 40105000)
DS Repositorio Institucional de la Universidad de Burgos
RD 25-dic-2024