Abstract
Fourier transform infrared spectra of complexes isolated from DNA and RNA interactions with Mg(II), Cu(II), Co(NH3)6 3+, Co(NH3)5C12+, cis- and trans-Pt(NH3)2 2+ were obtained and correlations between the spectral changes, coordination sites and conformational transitions are suggested. Spectroscopic evidence indicates that there is a direct metal interaction with the N7-site of the guanine base moiety and an indirect metal-phosphate binding through coordinated H2O or NH3 molecules for all the metal cation species employed, except for Co(NH3)6 3+. In the latter case there is an indirect metal-NH3….N7 and metal-NH3…O6 = C6, and an indirect metal-NH3…-0-P=0 interaction via the coordinated NH3 molecules.
The B to Z conformational transition was readily observed for the DNA molecule upon binding to the metal ions, whereas RNA conserves its A conformation in all the metal-RNA adducts. The marker bands for the B conformer (C2’-endo/anti) were observed at 825 (phosphodiester mode) and 690 cm-1 (guanine breathing mode). The marker bands were observed at 810 and 675 cmˉ1 for the A conformer (C3’-endo/anti). The B to Z conformational transition (C2’-endo/ anti to C3’-endo/syn) for the DNA molecule was accompanied with the bands at 810 cmˉ1 and 625–600 cmˉ1. The carbonyl band at 1701 in natural DNA shifts to lower frequencies upon a B to Z transition and the bands at 1485, 1371, 1285 and 1265 cm-1 also change considerably upon a B to Z transition.
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Theophanides, T., Tajmir-Riahi, H.A. (1986). Structure and Dynamics of Metal-Nucleic Acid Interactions. In: Rentzepis, P.M., Capellos, C. (eds) Advances in Chemical Reaction Dynamics. NATO ASI Series, vol 184. Springer, Dordrecht. https://doi.org/10.1007/978-94-009-4734-4_34
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DOI: https://doi.org/10.1007/978-94-009-4734-4_34
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