Kornilova S A, Kapinos L E, Blagoĭ Iu P
Mol Biol (Mosk). 1993 Nov-Dec;27(6):1276-86.
DNA complexed with Mn2+ ions in films is studied at different relative humidities and ion contents ([Mn2+]/[P] = 0.4-1) by IR spectroscopy. It is shown that substantially more sorbed water molecules are necessary for the transition of DNA complexed with Mn2+ ions into the double helical conformation (preferentially B-form) that for macromolecules in the absence of ions. DNA-Mn2+ complexes ([Mn2+]/[P] = 1) are able to absorb more water molecules than DNA. The results of the work evidence Mn2+ ion interaction with phosphates and nitrogen bases of the macromolecule: N7G, O6G.
通过红外光谱法，在不同相对湿度和离子含量（[Mn2+]/[P] = 0.4 - 1）下研究了薄膜中与Mn2+离子复合的DNA。结果表明，与没有离子时的大分子相比，与Mn2+离子复合的DNA转变为双螺旋构象（优先为B型）需要更多被吸附的水分子。DNA-Mn2+复合物（[Mn2+]/[P] = 1）比DNA能够吸收更多的水分子。该工作的结果证明了Mn2+离子与大分子的磷酸盐和氮碱基（N7G、O6G）之间的相互作用。
