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Solution structural studies of molybdate-nucleotide polyanions.

Lyndal M R Hill1, Graham N George, Anne Kathrin Duhme-Klair

  • 1School of Chemistry, University of Melbourne, Victoria 3010, Melbourne, Australia.

Journal of Inorganic Biochemistry
|March 19, 2002
PubMed
Summary

Molybdate forms complexes with adenosine and guanosine nucleotides, identified using NMR and X-ray spectroscopy. These complexes feature a pentamolybdodiphosphate core, confirmed in both solid and solution states.

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Area of Science:

  • Inorganic Chemistry
  • Biochemistry
  • Spectroscopy

Background:

  • Molybdate interactions with biological molecules are crucial for understanding various chemical processes.
  • Nucleotides like adenosine-5'-monophosphate (5'-AMP), adenosine-3'-monophosphate (3'-AMP), and guanosine-5'-monophosphate (5'-GMP) play vital roles in cellular functions.

Purpose of the Study:

  • To investigate the complexation of molybdate with specific nucleotides.
  • To characterize the structure and properties of the resulting molybdate-nucleotide complexes.

Main Methods:

  • Proton Nuclear Magnetic Resonance ((1)H NMR) spectroscopy
  • Phosphorus-31 Nuclear Magnetic Resonance ((31)P NMR) spectroscopy
  • Molybdenum K-edge X-ray Absorption Near Edge Structure (XANES) and Extended X-ray Absorption Fine Structure (EXAFS) spectroscopy

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Main Results:

  • Acidification of molybdate and nucleotide solutions formed a single species with characteristic NMR shifts.
  • A consistent Mo/nucleotide ratio of 2.5:1 was observed in the complexation species.
  • White compounds, Na(2)[Mo(5)O(15)(HB)(2)] (where B = 5'-AMP or 5'-GMP), were isolated.
  • Spectroscopic data confirmed a pentamolybdodiphosphate core in both solid and solution states of the complexes.

Conclusions:

  • Molybdate readily complexes with adenosine and guanosine nucleotides under acidic conditions.
  • The pentamolybdodiphosphate core is a stable structural motif in these molybdate-nucleotide complexes.
  • The findings provide insights into the coordination chemistry of molybdate with biologically relevant molecules.