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Nucleic Acids Research, 1989, Vol. 17, No. 11 4189-4203
© 1989

CHEMISTRY

Acoustical investigation of poly(dA).poly(dT), poly[d(A-T)].poly[d(A-T)], poly(A) . poly(U) and DNA hydration in dilute aqueous solutions

V.A. Buckin, B.I. Kankiya, A.P. Sarvazyan and H. Uedaira1

1Department of Polymer Science, Faculty of Science, The University of Hokkaido Sapporo, Japan Institute of Biological Physics, USSR Academy of Sciences Pushchino, Moscow region, USSR

Received April 13, 1989. Revised May 5, 1989. Apparent molar adiabatic compressibilities and apparent molar volumes of poly[d(A-T)) . poly[d(A-T)], poly(dA) . poly(dT), DNA and poly(A) . poly(U) in aqueous solutions were determined at 1°C. The change of concentration increment of the ultrasonic velocity upon replacing counter ion Cs+ by the Mg2+ ion was also determined for these polymers. The following conclusions have been made: (1) the hydration of the double helix of poly(dA) . poly(dT) is remarkably larger than that of other polynucleotides; (2) the hydration of the AT pair in the B-form DNA is larger than that of the GC pair; (3) the substitution of Cs+ for Mg2+ ions as counter ions results in a decrease of hydration of the system polynucleotide plus Mg2+, and (4) the magnitude of this dehydration depends on the nucleotide sequence; the following rule is true: the lesser is a polynucleotide hvdration, the larger dehydration upon chaning Cs+ for Mg2+ ions in the ionic atmosphere of polynucleotide.


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