Hydrolytic (in)stability of phosphate isosteres

Area of Science:

• Biochemistry
• Chemical Biology
• Nucleotide Chemistry

Background:

• Nucleotides are essential biomolecules, but their metabolic instability necessitates the development of stable analogs.
• Phosphate isosteres offer metabolic stability, yet their chemical stability remains largely uncharacterized.
• Understanding chemical stability is crucial for designing effective nucleotide analogs.

Purpose of the Study:

• To investigate and report the hydrolytic stability of thiophosphate (PS) and dithiophosphate (PS2) monoester isosteres.
• To elucidate the factors influencing the stability of PS and PS2 moieties within nucleotide structures.
• To provide guidance for selecting appropriate phosphate isosteres in scientific research.

Main Methods:

• Kinetic experiments were performed using uridine-PS and uridine-PS2 (UMPS and UMPS2) to determine their stability.
• Chemical and structural characterization of UMPS and UMPS2 was conducted.
• Comparative analysis of stability across different positions within the nucleotide phosphate chain.

Main Results:

• The hydrolytic stability of uridine-PS and uridine-PS2 was quantitatively assessed.
• Distinct stability profiles were observed for PS and PS2 isosteres.
• Structural features were identified that explain the differential stability of these moieties.
• The stability of PS and PS2 varied depending on their position in the nucleotide chain.

Conclusions:

• The chemical stability of thiophosphate and dithiophosphate nucleotide isosteres has been elucidated.
• This research provides critical data for the rational design and selection of metabolically stable nucleotide analogs.
• Findings will aid researchers in choosing optimal phosphate isosteres for various applications, enhancing experimental outcomes.