Phenylacetyl L-Glutamine

Phenylacetyl L-Glutamine (CAS No.: 28047-15-6) is an endogenous and microbiota-associated metabolite derived from amino acid fermentation and represents a major end product of phenylalanine metabolism in humans and primates, with its formation linked to colonic microbial activity and host-microbe co-metabolism. This compound is primarily excreted in urine and has been reported to exhibit age-dependent variation in systemic levels, highlighting its relevance as a metabolic biomarker in physiological and pathological states. Functionally, Phenylacetyl L-Glutamine has been implicated in the modulation of cellular signaling pathways and enzyme activities, with in vitro studies suggesting its ability to influence biological processes through regulatory effects on cell signaling networks, although specific molecular targets remain incompletely characterized. As a metabolite at the interface of host metabolism and the gut microbiome, it is increasingly investigated in the context of metabolic disorders, renal function, and microbiome-related disease mechanisms, providing a useful tool for probing biochemical pathways and host-microbial interactions. In experimental settings, it is commonly applied in cell-based assays and metabolomic studies, where concentration ranges are typically explored from low micromolar to millimolar levels depending on study design, supporting its utility in pathway elucidation, biomarker discovery, and early-stage drug research.