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Phase II Reactions: Glutathione Conjugation and Mercapturic Acid Formation01:22

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Glutathione, a tripeptide made up of glutamate, cysteine, and glycine, is a critical player in the detoxification of drugs and xenobiotics via a process known as glutathione conjugation or mercapturic acid formation. This phase II biotransformation reaction involves the covalent binding of glutathione to a drug or its metabolite, enhancing the compound's water solubility and enabling its excretion.
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Secondary amines react with nitrous acid to form N-nitrosamines, as depicted in Figure 1. Nitrous acid, a weak and unstable acid, is formed in situ from an aqueous solution of sodium nitrite and strong acids, such as hydrochloric acid or sulfuric acid, in cold conditions. In the presence of an acid, the nitrous acid gets protonated. The subsequent loss of water results in the formation of the electrophile known as nitrosonium ion.
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Sulfur is an essential element in biological systems, contributing to synthesizing key biomolecules, including amino acids such as cysteine and methionine, and cofactors such as coenzyme A and biotin. Microorganisms primarily assimilate sulfur as sulfate (SO₄²⁻) from the environment, which must undergo a series of biochemical transformations before it can be incorporated into cellular components. As sulfate is highly oxidized, it must undergo assimilatory sulfate reduction to become...
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S-nitrosoglutathione.

Katarzyna A Broniowska1, Anne R Diers, Neil Hogg

  • 1Department of Biochemistry, Medical College of Wisconsin, WI, USA.

Biochimica Et Biophysica Acta
|February 19, 2013
PubMed
Summary
This summary is machine-generated.

S-Nitrosoglutathione (GSNO) is a key molecule in nitric oxide (NO) signaling and S-nitrosation pathways. Understanding GSNO

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Area of Science:

  • Biochemistry
  • Molecular Biology
  • Physiology

Background:

  • S-Nitrosoglutathione (GSNO) is the S-nitrosated derivative of glutathione.
  • GSNO is a critical mediator of downstream signaling effects of nitric oxide (NO).
  • GSNO is implicated in various disease states.

Purpose of the Study:

  • To review the chemical nature and biological activities of GSNO.
  • To examine evidence for GSNO as an endogenous mediator of NO action.
  • To discuss the implications of GSNO for therapeutic use.

Main Methods:

  • Literature review focusing on GSNO's chemistry and biology.
  • Analysis of evidence supporting GSNO's role in NO signaling.
  • Exploration of GSNO's therapeutic potential.

Main Results:

  • GSNO exerts cellular actions via NO- and S-nitrosation-dependent mechanisms.
  • GSNO is a central intermediate in the formation and degradation of cellular S-nitrosothiols.

Conclusions:

  • GSNO's chemical and biological aspects are crucial within the broader context of S-nitrosation.
  • GSNO remains an important molecule for study due to its therapeutic potential.