Cysteine and methionine metabolism

Cysteine and methionine metabolism (CAS No.: 62697-73-8) Methionine sulfoxide is an oxidized derivative of the sulfur-containing amino acid methionine and belongs to the class of L-alpha-amino acids, characterized by the L-configuration at the alpha-carbon. It is generated through the interaction of methionine residues with reactive oxygen species and is widely recognized as a stable indicator of oxidative protein modification and cellular redox imbalance. Within biological systems, methionine sulfoxide participates in reversible redox cycling mediated by methionine sulfoxide reductases, thereby contributing to protein repair mechanisms and the regulation of oxidative stress responses. This compound is closely associated with pathways involved in cysteine and methionine metabolism, as well as broader cellular antioxidant defense systems, making it a valuable tool for investigating redox signaling, protein oxidation dynamics, and age-related or stress-induced molecular damage. In vitro studies typically employ this molecule in low micromolar to millimolar concentration ranges depending on the experimental model, particularly in assays examining oxidative stress markers, enzyme activity of reductases, and proteomic profiling of oxidized residues. It is commonly utilized in cell-based and biochemical assays, as well as in animal model research, to explore mechanisms of oxidative damage, protein turnover, and metabolic regulation, with dosing and experimental conditions tailored to specific study objectives.