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Related Experiment Videos

Magnesium-nucleic acid conformational changes and cancer.

T Theophanides, M Polissiou

    Magnesium
    |January 1, 1986
    PubMed
    Summary

    Magnesium ions alter the structure of guanosine-5'-monophosphate (5'-GMP Na2), shifting its sugar ring conformation. This magnesium binding at the N7 guanine site resembles cis-platinum

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    Area of Science:

    • Biochemistry
    • Molecular Biology
    • Spectroscopy

    Background:

    • Guanosine-5 -monophosphate (5 -GMP Na2) is a fundamental nucleotide.
    • Magnesium ions are crucial cofactors in numerous biological processes.
    • Understanding nucleotide-metal interactions is key to deciphering biological mechanisms.

    Purpose of the Study:

    • To investigate the structural impact of magnesium ions on 5 -GMP Na2.
    • To elucidate the binding site and mode of magnesium on 5 -GMP Na2.
    • To compare magnesium binding with that of other metal ions, such as cis-platinum.

    Main Methods:

    • Fourier transform infrared (FTIR) spectroscopy was employed.
    • Proton nuclear magnetic resonance (NMR) data were used for comparison.
    • Analysis of marker bands (820 cm-1 and 803 cm-1) associated with sugar ring conformations.

    Main Results:

    • Magnesium ions induced a significant conformational change in the 5 -GMP Na2 sugar ring from C2 -endo,anti to C3 -endo,anti.
    • The phosphate group adopted a gauche-gauche conformation.
    • The Mg(H2O)2+5 complex coordinated to the N7 site of guanine, with water molecules forming hydrogen bonds to the C6=O and phosphate oxygens.

    Conclusions:

    • Magnesium binding significantly alters the conformation of 5 -GMP Na2.
    • The observed binding mode at the N7 guanine site is analogous to that of cis-platinum.
    • This study provides insights into nucleotide-metal interactions relevant to biological systems and drug binding.

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