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Related Experiment Videos

Isolation and characterization of diazoate intermediate upon nitrous acid and nitric oxide treatment of

T Suzuki1, T Nakamura, M Yamada

  • 1Institute of Advanced Energy, Kyoto University, Uji, Japan.

Biochemistry
|June 3, 1999
PubMed
Summary

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A novel diazoate derivative of deoxycytidine (dCyd) was identified as a stable intermediate in reactions with nitrous acid (HNO2) and nitric oxide (NO). This diazoate is a major cytotoxic and genotoxic lesion in DNA, persisting under physiological conditions.

Area of Science:

  • Chemical Biology
  • DNA Damage and Repair
  • Biochemistry

Background:

  • Deoxycytidine (dCyd) can undergo modification by reactive nitrogen species like nitrous acid (HNO2) and nitric oxide (NO).
  • Understanding the reaction products and their stability is crucial for assessing DNA damage and cellular response.

Purpose of the Study:

  • To isolate and characterize the intermediate formed from dCyd treated with HNO2 and NO.
  • To determine the stability and biological relevance of this intermediate as a DNA lesion.

Main Methods:

  • Spectrometric measurements for product identification.
  • Reaction kinetics studies to determine yield and stability.
  • High-performance liquid chromatography (HPLC) for intermediate detection.
  • DNA thermal denaturation (Tm) assays to assess duplex stability.

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Main Results:

  • A diazoate derivative, 1-(beta-D-2'-deoxyribofuranosyl)-2-oxopyrimidine-4-diazoate, was identified as a reaction intermediate.
  • The diazoate is a stable intermediate, particularly under physiological conditions (pH 7.4, 37°C), with a half-life of 330 hours.
  • DNA duplexes containing the diazoate exhibit significantly reduced thermal stability compared to those with a normal C:G base pair.

Conclusions:

  • The diazoate is a major product and a persistent DNA lesion formed by dCyd reaction with HNO2 and NO.
  • The diazoate residue is not recognized or removed by uracil-DNA glycosylase.
  • This stable diazoate lesion has significant cytotoxic and genotoxic potential in vivo.