(2S,3S)-2-Amino-3-methylpentanoic acid

(2S,3S)-2-Amino-3-methylpentanoic acid (CAS No.: 73-32-5) is a naturally occurring branched-chain aliphatic amino acid, commonly referred to as L-isoleucine, that is widely distributed across biological systems including microorganisms, plants, and animals, where it functions as a fundamental metabolite in protein biosynthesis and cellular metabolism. As a structural isomer of leucine, it participates in diverse biochemical processes, including contributions to hemoglobin synthesis and the regulation of cellular energy balance and glucose metabolism, making it a valuable tool for investigating metabolic pathways and nutrient signaling networks. L-isoleucine has been implicated in modulation of inflammatory responses and host–pathogen interactions, with studies suggesting its involvement in pathways related to amino acid sensing and signaling, such as those associated with nutrient-responsive kinases. In vitro and in vivo experimental systems have demonstrated that branched-chain amino acids, including L-isoleucine, can influence cellular responses at concentrations typically spanning the low micromolar to millimolar range, depending on the model and assay conditions. This compound is frequently utilized in cell culture systems, microbial studies, and animal models to examine amino acid metabolism, protein turnover, and metabolic regulation, as well as in drug discovery workflows focused on metabolic disorders and pathway-targeted screening, where dosing and concentration parameters are adjusted according to specific experimental objectives.