Stability of strong polyelectrolyte-macroion complexesH. 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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