3-(5-Oxoisoxazolin-4-yl)-L-alanine is an antifungal antibiotic produced by the bacterium Streptomycesplatensis. The enzymes from the plants Lathyrusodoratus (sweet pea), L. sativus (grass pea) and Citrullus vulgaris (watermelon) that catalyse EC 184.108.40.206 (β-(isoxazolin-5-on-2-yl)-L-alanine synthase) also catalyse this reaction in vitro, but not in vivo. Closely related and possibly identical to EC 220.127.116.11, cysteine synthase, and EC 18.104.22.168, β-pyrazolylalanine synthase.
Ikegami, F., Kamiya, M., Kuo, Y.H., Lambein, F. and Murakoshi, I. Enzymatic synthesis of two isoxazolylalanine isomers by cysteine synthases in Lathyrus species. Biol. Pharm. Bull.19 (1996) 1214–1215. [PMID: 8889043]