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A study on the effect of Cu2+ ions on the stability of triple helix poly[(riboadenylic acid):2 poly(riboinosinic acid)]

✍ Scribed by Pin Yang; Erbing Hua; Binsheng Yang

Publisher: John Wiley and Sons
Year: 1997
Tongue: English
Weight: 231 KB
Volume: 198
Category: Article
ISSN: 1022-1352
DOI: 10.1002/macp.1997.021980509

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✦ Synopsis

Abstract

The effect of Cu^2+^ on the stability of the triple‐stranded helical structure of poly[(riboadenylic acid): 2 poly(riboinosinic acid)] poly(A : 21) was studied by means of circular dichroism spectroscopy and ultraviolet spectroscopy. The experimental results show that Cu^2+^ induces the hyperchromicity of poly(A : 2I) and causes the melting temperature T~m~ of poly(A : 2I) to decrease with increasing Cu^2+^ concentration. At the ratio of the concentration of Cu^2+^ to that of phosphate in poly(A : 2I), r~t~ = 0, poly(A : 2I) is stable, is stable, at r~t~ = 0.27, poly(A : 2I) decays in poly(A) and 2 poly(I), and at r~t~ = 1.6, there is a racemate.

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