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Related Experiment Videos

Why is CMP-ketodeoxyoctonate highly unstable?

C H Lin1, B W Murray, I R Ollmann

  • 1Department of Chemistry, Scripps Research Institute, La Jolla, California 92037, USA.

Biochemistry
|January 28, 1997
PubMed
Summary
This summary is machine-generated.

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Researchers synthesized CMP-ketodeoxyoctonate (CMP-KDO) analogs, finding fluorinated versions significantly enhance stability against hydrolysis. These findings offer insights into glycosidic bond cleavage mechanisms and CMP-KDO stability.

Area of Science:

  • Biochemistry
  • Organic Chemistry

Background:

  • CMP-ketodeoxyoctonate (CMP-KDO) is a crucial precursor in bacterial lipopolysaccharide synthesis.
  • Understanding the stability and hydrolysis of CMP-KDO is vital for developing antibacterial strategies.
  • Existing CMP-KDO analogs have limited stability, hindering their therapeutic potential.

Purpose of the Study:

  • To synthesize novel CMP-KDO analogs with enhanced stability.
  • To investigate the mechanisms underlying CMP-KDO hydrolysis.
  • To explore the impact of structural modifications on CMP-KDO stability.

Main Methods:

  • Enzymatic synthesis of CMP-KDO and its analogs (CMP-5-deoxy-5-fluoro-KDO, CMP-5-deoxy-KDO, CMP-5-epi-KDO) using CMP-KDO synthetase.
  • Stability assays to determine half-lives (t1/2) of CMP-KDO and its analogs.

Related Experiment Videos

  • Hydrolysis studies including solvent isotope effect measurements and molecular modeling.
  • Analysis of intramolecular hydrogen bonding and electronic effects on glycosidic cleavage.

    • Main Results:

    • CMP-KDO analogs exhibited significantly greater stability than CMP-KDO (t1/2 = 0.57 h).
    • Fluorination at the 5-position of CMP-KDO resulted in a 200-fold increase in stability.
    • Hydrolysis of CMP-KDO is facilitated by intramolecular hydrogen bonding and magnesium ion complexation.
    • A substantial solvent isotope effect (kH/kD = 2.7) suggests a specific hydrolysis mechanism.

    Conclusions:

    • Novel CMP-KDO analogs demonstrate markedly improved stability, offering potential as therapeutic agents.
    • Intramolecular hydrogen bonding and electronic effects play critical roles in CMP-KDO hydrolysis.
    • The proposed hydrolysis mechanism involves a twist-boat conformation and magnesium ion catalysis.