INTERACTION OF Ni^2+ IONS WITH HOMOPOLYNUCLEOTIDES CONTAINING ADENINE AND URACIL AND THEIR MONOMERS
Abstract
Interactions of Ni2+ ions with AMP, UMP, single-chain poly A, poly U, double-chain poly A poly U and three-chain poly A*2 poly U have been studied by the method of differential UV spectroscopy. The coiL->helix transition observed in polynucleotides is due to the Ni2+ ion binding to oxygen atoms of phosphate groups. The nickel coordination to bases takes place only in the case of single AMPs and single-chain poly A. The formation of a chelate N7-Ni2+-(P04) induces melting of this polymer. Melted parts form compact particles with the effective radius ~100A.
KEY WORDS: UV spectroscopy, homopolynucleotides, metal ions.
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