L-Methionine

L-Methionine (CAS No.: 63-68-3) is a sulfur-containing essential amino acid and the naturally occurring L-isomer of methionine, widely utilized in biochemical and pharmacological research as a key regulator of cellular metabolism and redox homeostasis. As a precursor in the methionine cycle, it plays a central role in methyl group transfer through S-adenosylmethionine-dependent pathways, thereby influencing epigenetic regulation, gene expression, and protein function. L-Methionine is also involved in transsulfuration processes that contribute to glutathione biosynthesis, linking it to antioxidant defense mechanisms and cellular responses to oxidative stress. Experimental studies indicate that L-methionine can modulate cell proliferation and apoptosis, with reported activity observed in the micromolar concentration range in various in vitro systems, supporting its utility in investigating mechanisms of cell cycle regulation and programmed cell death. Additionally, its capacity to interact with certain metal ions under defined conditions makes it relevant for studies on metal ion homeostasis and detoxification pathways. L-Methionine is commonly applied in cell-based assays and animal models to explore metabolic regulation, oxidative stress responses, and liver-associated biochemical pathways, with concentrations or dosing regimens adjusted according to specific experimental objectives.