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Related Experiment Videos

Peroxynitrite-dependent tryptophan nitration

B Alvarez1, H Rubbo, M Kirk

  • 1Departamento de Bioquímica, Universidad de la República, Montevideo, Uruguay.

Chemical Research in Toxicology
|March 1, 1996
PubMed
Summary
This summary is machine-generated.

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Peroxynitrite (ONOO-) can nitrate tryptophan, forming nitrotryptophan. This metal-independent reaction occurs via two mechanisms, influenced by pH and scavengers.

Area of Science:

  • Biochemistry
  • Oxidative Stress Research
  • Nitric Oxide Signaling

Background:

  • Peroxynitrite (ONOO-), a reactive nitrogen species formed from superoxide (O2.-) and nitric oxide (.NO), is known to nitrate tyrosine and other phenolic compounds.
  • The role of peroxynitrite in modifying amino acids, particularly tryptophan, and the underlying mechanisms remain areas of active investigation in oxidative stress research.

Purpose of the Study:

  • To investigate the metal-independent nitration of tryptophan by peroxynitrite.
  • To elucidate the reaction mechanisms, kinetics, and influencing factors of tryptophan nitration by peroxynitrite.

Main Methods:

  • Analysis of nitrotryptophan formation using spectral characteristics and liquid chromatography-mass spectrometry.
  • Kinetic studies involving varying peroxynitrite to tryptophan ratios, pH, and the presence of metal chelators, antioxidants, and superoxide dismutase.

Related Experiment Videos

  • Determination of reaction rate constants, activation enthalpy, and activation entropy.

    • Main Results:

    • Tryptophan is nitrated by peroxynitrite in the absence of transition metals, predominantly forming one nitrotryptophan isomer.
    • Nitrotryptophan formation is favored at acidic pH (apparent pKa of 7.8) and is influenced by scavengers like cysteine, ascorbate, and methionine.
    • Kinetic analysis suggests two parallel metal-independent nitration mechanisms involving ground-state peroxynitrous acid and an activated intermediate (ONOOOH*).

    Conclusions:

    • Peroxynitrite directly nitrates tryptophan via distinct metal-independent pathways.
    • The reaction kinetics and product distribution are modulated by pH and the presence of various chemical species.
    • Understanding these nitration pathways is crucial for assessing the biological impact of reactive nitrogen species.