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Nucleic Acids Research, 1985, Vol. 13, No. 1 251-260
© 1985

Articles

The infrared spectrum and structure of the type I complex of silver and DNA

Domenick E. DiRico, Jr., Patrick B. Keller and Karl A. Hartman*

Department of Biochemistry and Biophysics, University of Rhode Island Kingston, RI 02881, USA

*To whom correspondence should be addressed

Received September 26, 1984. Accepted December 4, 1984.

Infrared spectroscopy was used to study films of the type I complex of Ag+ and DNA as a function of hydration with the following conclusions. (1) Ag+ binds to guanine residues but not to cytosine or thymine residues. (2) Cytosine becomes protonated as Ag+ binds to guanine. (These conclusions confirm previous models.) (3) The type I complex remains in the B family of structures with slight modifications of the sugar-phosphate geometry. (4) This modified B structure remains stable at lower values of hydration for which pure DNA is in the A form. (5) Binding of Ag+ to PO2 O-P-O or the deoxyribose oxygen is excluded.


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