n-acetyl cysteine (nac), as a nutritional supplement, is a greatly applied antioxidant in vivo and in vitro. nac is a precursor of l-cysteine that results in glutathione elevation biosynthesis. it acts directly as a scavenger of free radicals, especially oxygen radicals. nac is a powerful antioxidant. it is also recommended as a potential treatment option for different disorders resulted from g...

Altering the redox state of cysteine residues on protein surfaces is an important response to environmental challenges. Although aging and fasting alter many redox processes, the role of cysteine residues is uncertain. To address this, we used a redox proteomic technique, oxidative isotope-coded affinity tags (OxICAT), to assess cysteine-residue redox changes in Drosophila melanogaster during a...

A potentiometric procedure for cysteine thiol group concentration monitoring in media generating free radicals was developed using a thiol specific silver-mercury electrode. Electrolytic deposition of mercury on a silver wire and treatment with 20 mM cysteine in 0.5 M NaOH were used to produce the electrode. A silver-chloride electrode in saturated KCl was the reference. A glass capillary with ...

Clostridium difficile, a major cause of nosocomial diarrhea and pseudomembranous colitis, still poses serious health-care challenges. The expression of its two main virulence factors, TcdA and TcdB, is reportedly repressed by cysteine, but molecular mechanism remains unclear. The cysteine desulfidase CdsB affects the virulence and infection progresses of some bacteria. The C. difficile strain 6...

BACKGROUND Mitochondrial encephalomyopathies are severe, relentlessly progressive conditions and there are very few effective therapies available to date. We have previously suggested that in two rare forms of reversible mitochondrial disease (reversible infantile respiratory chain deficiency and reversible infantile hepatopathy) supplementation with L-cysteine can improve mitochondrial protein...

The enzymatic synthesis of homocysteine (from homoserine and H2S) and cysteine (from serine and H2S) has been demonstrated in Neurospora crassa. Purification and properties of the enzyme, or enzymes, are described. Both homocysteine and cysteine synthetase are subject to end product feedback control by methionine, which appears to be noncompetitive inhibition. Repression of both activities by m...

Abstract Objective Clinical manifestation of the inflammatory process in its relation to biochemical markers (total cysteine [Cys], cysteine-glycine [CysGly], glutathione [GSH], glutamate-cysteine [Glu-Cys], homocysteine [Hcy], ratio reduced oxidized [GSH/GSSG], [CySH/CySS], malondialdehyde-oxidized low-density lipoproteins [MDA-oxLDL]) has been studied patients with coronavirus disease 2019 (C...