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DNA conformational equilibrium in the presence of Zn2+ ions in neutral and alkaline solutions.

Abstract：

:Effect of Zn(2+) ions on DNA transition from B-form to a metallized form (m-DNA) in Tris and tetraborate buffers at pH 8.5 has been studied by visible and differential UV-spectroscopy and by thermal denaturation. The results have been compared to those obtained at pH 6.5 in cacodylate buffer. It was found that in alkaline solutions Zn(2+) ions induced a hypochromicity of the DNA absorption in the whole spectral range monitored, which was attributed to DNA transition from B- to the m-form. Complete metallization occurred only upon heating the DNA solutions containing more than ~2×10(-4) M of Zn(2+) ions. Phase diagrams of the DNA-zinc complexes at pH 6.5 and 8.5 have been obtained for the first time. The m-DNA form showed higher thermal stability compared to B-DNA.

journal_name

Int J Biol Macromol

journal_title

International journal of biological macromolecules

authors

Sorokin VA,Valeev VA,Usenko EL,Andrushchenko VV

doi

10.1016/j.ijbiomac.2011.11.011

subject

Has Abstract

pub_date

2012-04-01 00:00:00

pages

854-60

issue

3

eissn

0141-8130

issn

1879-0003

pii

S0141-8130(11)00428-4

journal_volume

50

pub_type

杂志文章

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