Solid-state NMR investigation of sodium nucleotide complexes

Area of Science:

• Solid-state Nuclear Magnetic Resonance (NMR) spectroscopy.
• Coordination chemistry.
• Nucleotide complex analysis.

Background:

• Sodium ions play crucial roles in the structure and function of nucleotide complexes.
• Understanding sodium ion coordination is essential for characterizing these biological molecules.
• Solid-state NMR offers a powerful, non-destructive method for probing local atomic environments.

Purpose of the Study:

• To utilize solid-state NMR to analyze the chemical environments of sodium sites in powdered crystalline sodium nucleotide complexes.
• To correlate NMR-derived parameters with known crystallographic structures.
• To identify and characterize novel nucleotide complexes and assign spectral sites.

Main Methods:

• (23)Na multiple-quantum magic-angle-spinning NMR spectroscopy.
• Analysis of nuclear quadrupole coupling parameters.
• Comparison with crystallographic data for structural validation.

Main Results:

• Successfully correlated (23)Na NMR quadrupole coupling parameters with sodium ion coordination environments in previously characterized complexes.
• Identified two novel sodium nucleotide complexes, disodium uridine-3'-monophosphate and a mixed uridine-monophosphate salt, without prior structural data.
• Provided a spectroscopic assignment for four distinct sodium sites in disodium adenosine-5'-triphosphate trihydrate.

Conclusions:

• Solid-state NMR is effective for determining sodium ion coordination in crystalline nucleotide complexes.
• The methodology enables the structural identification and characterization of novel nucleotide complexes.
• A general approach for spectroscopic assignment of multiple sodium sites in nucleotide complexes has been developed.