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- W2024164498 abstract "DNA molecules form dense liquid-crystalline twisted phases both in vivo and in vitro. How the microscopic DNA chirality is transferred into intermolecular twist in these mesophases and what is the role of chiral DNA−DNA electrostatic interactions is still not completely clear. In this paper, we first give an extended overview of experimental observations on DNA cholesteric phases and discuss the factors affecting their stability. Then, we consider the effects of steric and electrostatic interactions of grooved helical molecules on the sign of cholesteric twist. We present some theoretical results on the strength of DNA−DNA chiral electrostatic interactions, on DNA−DNA azimuthal correlations in cholesteric phases, on the value of DNA cholesteric pitch, and on the regions of existence of DNA chiral phases stabilized by electrostatic interactions. We suggest for instance that 146 bp long DNA fragments with stronger affinities for the nucleosome formation can form less chiral cholesteric phases, with a larger left-handed cholesteric pitch. Also, the value of left-handed pitch formed in assemblies of homologous DNA fragments is predicted to be smaller than that of randomly sequenced DNAs. We expect also the cholesteric assemblies of several-kbp-long DNAs to require higher external osmotic pressures for their stability than twisted phases of short nucleosomal DNA fragments at the same DNA lattice density." @default.
- W2024164498 created "2016-06-24" @default.
- W2024164498 creator A5000538495 @default.
- W2024164498 date "2008-09-12" @default.
- W2024164498 modified "2023-10-12" @default.
- W2024164498 title "DNA Cholesteric Phases: The Role of DNA Molecular Chirality and DNA−DNA Electrostatic Interactions" @default.
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- W2024164498 doi "https://doi.org/10.1021/jp801220p" @default.
- W2024164498 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/18785770" @default.
- W2024164498 hasPublicationYear "2008" @default.
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