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• W1999954042 endingPage "13584" @default.
• W1999954042 startingPage "13579" @default.
• W1999954042 abstract "DNA exhibits a surprising multiplicity of structures when it is packed into dense aggregates. It undergoes various polymorphous transitions (e.g., from the B to A form) and mesomorphous transformations (from hexagonal to orthorhombic or monoclinic packing, changes in the mutual alignment of nearest neighbors, etc). In this report we show that such phenomena may have their origin in the specific helical symmetry of the charge distribution on DNA surface. Electrostatic interaction between neighboring DNA molecules exhibits strong dependence on the patterns of molecular surface groups and adsorbed counter-ions. As a result, it is affected by such structural parameters as the helical pitch, groove width, the number of base pairs per helical turn, etc. We derive expressions which relate the energy of electrostatic interaction with these parameters and with the packing variables characterizing the axial and azimuthal alignment between neighboring macromolecules. We show, in particular, that the structural changes upon the B-to-A transition reduce the electrostatic energy by approximately kcal/mol per base pair, at a random adsorption of counter ions. Ion binding into the narrow groove weakens or inverts this effect, stabilizing B-DNA, as it is presumably the case in Li+-DNA assemblies. The packing symmetry and molecular alignment in DNA aggregates are shown to be affected by the patterns of ion binding." @default.
• W1999954042 created "2016-06-24" @default.
• W1999954042 creator A5027359414 @default.
• W1999954042 creator A5067195354 @default.
• W1999954042 date "1998-11-10" @default.
• W1999954042 modified "2023-09-27" @default.
• W1999954042 title "Electrostatic interaction between helical macromolecules in dense aggregates: An impetus for DNA poly- and meso-morphism" @default.
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• W1999954042 doi "https://doi.org/10.1073/pnas.95.23.13579" @default.
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