Europhys. Lett.
Volume 71, Number 6, September 2005
Page(s) 1022 - 1028
Section Interdisciplinary physics and related areas of science and technology
Published online 10 August 2005
Europhys. Lett., 71 (6), pp. 1022-1028 (2005)
DOI: 10.1209/epl/i2005-10174-3

Stability of strong polyelectrolyte-macroion complexes

H. Boroudjerdi and R. R. Netz

Physics Department, Technical University of Munich - D-85748 Garching, Germany

received 31 May 2005; accepted in final form 15 July 2005
published online 10 August 2005

We investigate the thermodynamic stability of complexes formed by one semiflexible charged polymer wrapped around an oppositely charged sphere. Choosing parameters for DNA and histones, we determine all conformational eigen-modes and the corresponding eigen-value spectrum of the complexed chain, from which the free energy of complexation and thus the reaction constant is obtained. The resulting complexation diagram exhibits qualitative agreement with experimental results as a function of salt and DNA/histone concentration.

87.15.-v - Biomolecules: structure and physical properties.
61.25.Hq - Macromolecular and polymer solutions; polymer melts; swelling.
82.70.Dd - Colloids.

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