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Literature DB >> 7711268

Polymer- and salt-induced toroids of hexagonal DNA.

Abstract

A model is proposed for polymer- and salt-induced toroidal condensates of DNA, based on a recent theory of the undulation enhancement of the electrostatic interaction in the bulk hexagonal phase of semiflexible polyions. In a continuum approximation, the thermodynamic potential of a monomolecular toroid may be split up in bulk, surface, and curvature contributions. With the help of an approximate analytical minimization procedure, the optimal torus dimensions are calculated as a function of the concentrations of inert polymer and added salt. The stability of the torus is analyzed in terms of its surface tension and a bulk melting criterion. The theory should be applicable to psi-toroids that are not too thick.

Entities: Chemical

Mesh：

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Year: 1995 PMID： 7711268 PMCID： PMC1281660 DOI： 10.1016/S0006-3495(95)80158-X

Source DB: PubMed Journal: Biophys J ISSN： 0006-3495 Impact factor: 4.033

21 in total

1. Counterion-induced condesation of deoxyribonucleic acid. a light-scattering study.

Authors: R W Wilson; V A Bloomfield
Journal: Biochemistry Date: 1979-05-29 Impact factor: 3.162

2. Evidence for hydrated spermidine-calf thymus DNA toruses organized by circumferential DNA wrapping.

Authors: K A Marx; G C Ruben
Journal: Nucleic Acids Res Date: 1983-03-25 Impact factor: 16.971

3. DNA condensation with polyamines I. Spectroscopic studies.

Authors: L C Gosule; J A Schellman
Journal: J Mol Biol Date: 1978-05-25 Impact factor: 5.469

4. DNA condensation with polyamines. II. Electron microscopic studies.

Authors: D K Chattoraj; L C Gosule; A Schellman
Journal: J Mol Biol Date: 1978-05-25 Impact factor: 5.469

5. Cation-induced toroidal condensation of DNA studies with Co3+(NH3)6.

Authors: J Widom; R L Baldwin
Journal: J Mol Biol Date: 1980-12-25 Impact factor: 5.469

6. The structure of psi DNA.

Authors: T Maniatis; J H Venable; L S Lerman
Journal: J Mol Biol Date: 1974-03-25 Impact factor: 5.469

7. Polyelectrolyte effects in DNA condensation by polyamines.

Authors: V A Bloomfield; R W Wilson; D C Rau
Journal: Biophys Chem Date: 1980-06 Impact factor: 2.352

8. Light-scattering study of DNA condensation: competition between collapse and aggregation.

Authors: C B Post; B H Zimm
Journal: Biopolymers Date: 1982-11 Impact factor: 2.505

9. A comparative X-ray diffraction and circular dichroism study of DNA compact particles formed in water-salt solutions, containing poly(ethylene glycol).

Authors: Y M Evdokimov; T L Pyatigorskaya; O F Polyvtsev; N M Akimenko; V A Kadykov; D Y Tsvankin; Y M Varshavsky
Journal: Nucleic Acids Res Date: 1976-09 Impact factor: 16.971

10. Polyamine structural effects on the induction and stabilization of liquid crystalline DNA: potential applications to DNA packaging, gene therapy and polyamine therapeutics.

Authors: M Saminathan; Thresia Thomas; Akira Shirahata; C K S Pillai; T J Thomas
Journal: Nucleic Acids Res Date: 2002-09-01 Impact factor: 16.971

Polymer- and salt-induced toroids of hexagonal DNA.

1. Counterion-induced condesation of deoxyribonucleic acid. a light-scattering study.

2. Evidence for hydrated spermidine-calf thymus DNA toruses organized by circumferential DNA wrapping.

3. DNA condensation with polyamines I. Spectroscopic studies.

4. DNA condensation with polyamines. II. Electron microscopic studies.

5. Cation-induced toroidal condensation of DNA studies with Co3+(NH3)6.

6. The structure of psi DNA.

7. Polyelectrolyte effects in DNA condensation by polyamines.

8. Light-scattering study of DNA condensation: competition between collapse and aggregation.

9. A comparative X-ray diffraction and circular dichroism study of DNA compact particles formed in water-salt solutions, containing poly(ethylene glycol).

10. Characterization of DNA condensates induced by poly(ethylene oxide) and polylysine.

1. DNA delivery by phage as a strategy for encapsulating toroidal condensates of arbitrary size into liposomes.

2. Cryoelectron microscopy of lambda phage DNA condensates in vitreous ice: the fine structure of DNA toroids.

3. Controlling the size of nanoscale toroidal DNA condensates with static curvature and ionic strength.

4. Structure of toroidal DNA collapsed inside the phage capsid.

5. Coil-globule coexistence and compaction of DNA chains.

6. A geometrical template for toroidal aggregates of chiral macromolecules.

7. Topological defects and the optimum size of DNA condensates.

8. Hexagonally packed DNA within bacteriophage T7 stabilized by curvature stress.

9. Effect of spermine and DNase on DNA release from bacteriophage T5.

10. Polyamine structural effects on the induction and stabilization of liquid crystalline DNA: potential applications to DNA packaging, gene therapy and polyamine therapeutics.