Counterion Induced Electrostatic Condensation Of Nucleosomes And Chromatin Arrays
نویسندگان
چکیده
منابع مشابه
Counterion condensation and fluctuation-induced attraction.
We consider an overall neutral system consisting of two similarly charged plates and their oppositely charged counterions and analyze the electrostatic interaction between the two surfaces beyond the mean-field Poisson-Boltzmann approximation. Our physical picture is based on the fluctuation-driven counterion condensation model, in which a fraction of the counterions is allowed to "condense" on...
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We predict a condensation phenomenon in an overall neutral system, consisting of a single charged plate and its oppositely charged counterions. Based on the "two-fluid" model, in which the counterions are divided into a "free" and a "condensed" fraction, we argue that for high surface charge, fluctuations can lead to a phase transition in which a large fraction of counterions is condensed. Furt...
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Counterion condensation is a basic feature of 2D electrostatics exhibited by highly charged rodlike polymers such as DNA. In the framework of the Poisson Boltzmann equation with salt, we show that such a polymer of radius a attracts a condensate of thickness RM=A(axi)1/2 where xi is the Debye length and A depends weakly on the polymer charge density q0. To leading order in 1/ln(xi/a), we derive...
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Université de Lyon; Laboratoire Joliot-Curie, CNRS USR 3010, Ecole Normale Supérieure de Lyon, 46 allée d’Italie, 69364 Lyon Cedex 07, France ; Université de Lyon; Laboratoire de Physique, CNRS UMR 5672, Ecole Normale Supérieure de Lyon, 46 allée d’Italie, 69364 Lyon Cedex 07, France ; Université de Lyon; Laboratoire de Biologie Moléculaire de la Cellule, CNRS UMR 5239, Ecole Normale Supérieure...
متن کاملDivalent counterion-induced condensation of triple-strand DNA.
Understanding and manipulation of the forces assembling DNA/RNA helices have broad implications for biology, medicine, and physics. One subject of significance is the attractive force between dsDNA mediated by polycations of valence ≥ 3. Despite extensive studies, the physical origin of the "like-charge attraction" remains unsettled among competing theories. Here we show that triple-strand DNA ...
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ژورنال
عنوان ژورنال: Biophysical Journal
سال: 2009
ISSN: 0006-3495
DOI: 10.1016/j.bpj.2008.12.176