SPECTROSCOPIC STUDY OF THE INTERACTION BETWEEN POLY-(9-VINYLADENINE) AND SINGLE OR MULTISTRAND RNA

The interaction between poly (9-vinyladenine) (PVAd) and poly [r(U)] was investigated by means of uv, CD, H-1-, and P-31-nmr spectroscopies. The interaction was dependent on the molecular weight of PVAd determined by uv and CD spectroscopies. Based on imino proton nmr, it was clearly found that PVAd formed the complex with poly [r(U)] by complementary hydrogen bonding. The interaction of PVAd with double- and triple-stranded helices of RNA was also investigated by uv melting behavior and P-31-nmr spectroscopy. The results suggested that PVAd could not interact with the double-stranded poly [r(A)].poly[r(U)] but did with the triple-stranded RNA.