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Generalized Poisson-Boltzmann calculation of the distribution of electrolyte ions around the B- and Z-conformers of DNA

✍ Scribed by George R. Pack; Brian J. Klein

Publisher: Wiley (John Wiley & Sons)
Year: 1984
Tongue: English
Weight: 1015 KB
Volume: 23
Category: Article
ISSN: 0006-3525
DOI: 10.1002/bip.360231208

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✦ Synopsis

A solution to the three-dimensional Poisson-Boltzmann equation, generalized to include the finite size of the ions, is presented for the environment of DNA in the B-and Z-conformations. The results clearly indicate that despite the lower linear charge density of the left-handed Z-conformer, there is a higher concentration of Na+ a t the immediate surface of the Z-form than at the surface of the B-form. The average concentration of counterions within a 12-A radius of the DNA is, nonetheless, higher for the Bthan for the Z-form. Calculations of the electrostatic interactions of these conformers with an environment of 0.01M monovalent salt show that the salt exerts a greater stabilizing effect on the left-handed conformer than on the right-handed form.

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