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ATP-Fe and AMP-Fe complexes in water (H2O and 2H2O) at pH 7.5 were studied using Raman spectroscopy. Parallel and perpendicular polarization spectra were recorded in the spectral range 200-1650 cm-1, and the depolarization ratios for most of the bands were calculated. The changes in the frequencies, intensities and depolarization ratios of the ATP and AMP bands after the addition of FeCl3 showed that the adenine moiety, in addition to the phosphate(s), was involved in the binding of Fe to both ATP and AMP. Direct interactions of Fe(III) with the phosphate chain and the N-7 nitrogen and indirect interaction (via water molecules) with the amide group were proposed for the ATP-Fe complex. In contrast, direct interaction with the phosphate group and indirect interaction with the amide group were observed for the AMP-Fe complex. The different interactions of the two complexes suggest an 'anti' conformation for the ATP-Fe complex and a 'syn' conformation for the AMP-Fe complex. The strong binding of Fe to ATP compared with AMP and the difference in the conformation of the ATP-Fe and the AMP-Fe complexes may be significant in the pathway of Fe release in mitochondria.

A Raman study of the binding of Fe(III) to ATP and AMP