Abstract
Four different molecular dynamics (MD) simulations have been performed for infinitely long ordered DNA molecules with different counterions, namely the two natural polyamines spermidine(3+) (Spd3+) and putrescine(2+) (Put2+), the synthetic polyamine diaminopropane(2+)(DAP2+), and the simple monovalent cation Na+. All systems comprised a periodical hexagonal cell with three identical DNA decamers, 15 water molecules per nucleotide, and counterions balancing the DNA charge. The simulation setup mimics the DNA state in oriented DNA fibers, previously studied using NMR and other experimental methods. In this paper the interplay between polyamine binding and local DNA structure is analyzed by investigating how and if the minor groove width of DNA depends on the presence and dynamics of the counterions. The results of the MD simulations reveal principal differences in the polyamine–DNA interactions between the natural [spermine(4+), Spd3+, Put2+] and the synthetic (DAP2+) polyamines.
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Abbreviations
- DAP:
-
diaminopropane
- DDD:
-
Drew–Dickerson dodecamer
- MD:
-
molecular dynamics
- Put:
-
putrescine
- RDF:
-
radial distribution function
- Spd:
-
spermidine
- Spm:
-
spermine
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Acknowledgements
This work has been supported by the Swedish Science Research Council. N.K. acknowledges the support for a research fellowship from the School of Biological Sciences, NTU and from the Biomedical Research Council (BMRC), Singapore.
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Korolev, N., Lyubartsev, A.P., Laaksonen, A. et al. A molecular dynamics simulation study of polyamine– and sodium–DNA. Interplay between polyamine binding and DNA structure. Eur Biophys J 33, 671–682 (2004). https://doi.org/10.1007/s00249-004-0410-7
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DOI: https://doi.org/10.1007/s00249-004-0410-7