Abstract
In this study, we use optical tweezers to investigate the ionic effects of magnesium salt solutions on the overstretching transition of single B-DNA molecules. The experimental data are compared with those in sodium salt solutions. The overstretching transition force increases when the NaCl or MgCl2 salt concentration increases. Magnesium cations have much stronger effects on the overstretching transition force than sodium cations. For both NaCl and MgCl2 salt solutions, the overstretching transition force is linear with the natural logarithm of salt concentration, which confirms the theory proposed in previous paper. The modified ZZO model is applied to study the electrostatic contribution of magnesium salt solutions to the overstretching transition of single B-DNA molecules. The consistency between the experimental data and analytical results shows that the modified ZZO model can simulate the transition behavior of single B-DNA molecules in different NaCl and MgCl2 salt solutions.
Similar content being viewed by others
References
S.B. Smith, L. Finzi, C. Bustamante, Science 258, 1122 (1992).
T.R. Strick, J.-F. Allemand, D. Bensimon, A. Bensimon, V. Croquette, Science 271, 1835 (1996).
J. Yan, D. Skoko, J.F. Marko, Phys. Rev. E 70, 011905 (2004).
T.T. Perkins, D.E. Smith, R.G. Larson, S. Chu, Science 268, 83 (1995).
M.D. Wang, H. Yin, R. Landick, J. Gelles, S.M. Block, Biophys. J. 72, 1335 (1997).
M.C. Williams, J.R. Wenner, I. Rouzina, V.A. Bloomfield, Biophys. J. 80, 874 (2001).
M.C. Williams, I. Rouzina, V.A. Bloomfield, Acc. Chem. Res. 35, 159 (2002).
P. Cluzel, A. Lebrun, C. Heller, R. Lavery, J.L. Viovy, D. Chatenay, F. Caron, Science 271, 792 (1996).
S.B. Smith, Y.J. Cui, C. Bustamante, Science 271, 795 (1996).
C.G. Baumann, S.B. Smith, V.A. Bloomfield, C. Bustamante, Proc. Natl. Acad. Sci. U.S.A. 94, 6185 (1997).
J.R. Wenner, M.C. Williams, I. Rouzina, V.A. Bloomfield, Biophys. J. 82, 3160 (2002).
H. Clausen-Schaumann, M. Rief, C. Tolksdorf, H. Gaub, Biophys. J. 78, 1997 (2000).
M. Rief, H. Clausen-Schaumann, H.E. Gaub, Nature Struct. Biol. 6, 346 (1999).
J.F. Marko, E.D. Siggia, Macromolecules 28, 8759 (1995).
R. Podgornik, P.L. Hansen, V.A. Parsegian, J. Chem. Phys. 113, 9343 (2000).
A. Vologodskii, Macromolecules 27, 5623 (1994).
I. Rouzina, V.A. Bloomfield, Biophys. J. 77, 3242 (1999).
I. Rouzina, V.A. Bloomfield, Biophys. J. 77, 3252 (1999).
I. Rouzina, V.A. Bloomfield, Biophys. J. 80, 882 (2001).
I. Rouzina, V.A. Bloomfield, Biophys. J. 80, 894 (2001).
O. Punkkinen, P.L. Hansen, L. Miao, I. Vattulainen, Biophys. J. 89, 967 (2005).
H. Fu, C.G. Koh, H. Chen, Eur. Phys. J. E 17, 231 (2005).
R. Dong, X. Yan, G. Yu, S. Liu, Phys. Lett. A 318, 600 (2003).
S. Cocco, J. Yan, J.-F. Lger, D. Chatenay, J.F. Marko, Phys. Rev. E 70, 011910 (2004).
H. Fu, C.G. Koh, H. Chen, C.T. Lim, Solid State Phenom. 121-123, 1093 (2007).
H.J. Zhou, Y. Zhang, Z.C. Ou-yang, Phys. Rev. E. 62, 1045 (2000).
A. Ashkin, J.M. Dziedzic, J.E. Bjorkholm, Steven Chu, Opt. Lett. 11, 288 (1986).
J. Happel, H. Brenner, Low Reynolds Number Hydrodynamics (Kluwer Academic, Dordecht, 1991).
K. Svoboda, S.M. Block, Ann. Rev. Biophys. Biomol. Struct. 23, 47 (1994).
Roland R. Netz, Macromolecules 34, 7522 (2001).
T.K. Chiu, R.E. Dickerson, J. Mol. Biol. 301, 915 (2000).
Author information
Authors and Affiliations
Corresponding author
Rights and permissions
About this article
Cite this article
Fu, H., Chen, H., Koh, C.G. et al. Effects of magnesium salt concentrations on B-DNA overstretching transition. Eur. Phys. J. E 29, 45–49 (2009). https://doi.org/10.1140/epje/i2009-10448-0
Received:
Revised:
Accepted:
Published:
Issue Date:
DOI: https://doi.org/10.1140/epje/i2009-10448-0