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L-kynurenine is a key intermediate in the kynurenine pathway, which is the primary route for the catabolism of the amino acid tryptophan in mammals. This pathway is responsible for over 95% of tryptophan degradation and leads to the production of several biologically active metabolites, including kynurenic acid and NAD+. L-kynurenine is synthesized from tryptophan by the enzyme tryptophan 2,3-dioxygenase and further metabolized by kynureninase, which preferentially reacts with L-kynurenine in prokaryotes and with 3-hydroxy-L-kynurenine in eukaryotes. The structure of kynureninase has been elucidated through crystallography studies, revealing the active sites in both Pseudomonas fluorescens and Homo sapiens. Functionally, L-kynurenine and its metabolites play roles in immune response, neuronal excitability, and host-microbiome signaling, with implications for inflammation and neuroprotection.
仅用于科研。不用于诊断过程。未经明确授权不得转售。