title: Detection of 2H-1,4-thiazine-5,6-dihydro-3-carboxylic acid (aminoethylcysteine ketimine) in the bovine brain.
abstract: 2H-1,4-Thiazine-5,6-dihydro-3-carboxylic acid (trivial name: aminoethylcysteine ketimine) is a cyclic sulfur-containing imino acid detected in bovine brain extracts by means of three different procedures. Gas liquid chromatography of protein-free extracts of five bovine brains revealed the presence of this compound at concentrations ranging from 2 to 3 nmol/g wet weight of tissue. The enzymatic method based on the inhibition of D-amino acid oxidase activity by aminoethylcysteine ketimine together with an high-performance liquid chromatography procedure confirm the identification and quantitations obtained with gas liquid chromatography. The discovery of this compound structurally similar to pipecolic acid opens the question of its physiological role in the central nervous system.
authors.affiliation: Department of Biochemical Sciences, University of Rome, La Sapienza, Italy.
authors.forename: M
authors.initials: M
authors.lastname: Nardini
authors.forename: R M
authors.initials: RM
authors.lastname: Matarese
authors.forename: L
authors.initials: L
authors.lastname: Pecci
authors.forename: A
authors.initials: A
authors.lastname: Antonucci
authors.forename: G
authors.initials: G
authors.lastname: Ricci
authors.forename: D
authors.initials: D
authors.lastname: Cavallini
mesh_terms: D000603:Amino Acids, Sulfur / Q000032:analysis*; D000818:Animals; D001923:Brain Chemistry; D002417:Cattle; D002531:Cerebellum / Q000032:analysis; D002540:Cerebral Cortex / Q000032:analysis; D002849:Chromatography, Gas; D002851:Chromatography, High Pressure Liquid; D003605:D-Amino-Acid Oxidase / Q000378:metabolism
chemical_list: D000603:Amino Acids, Sulfur; C035497:thialysine ketimine; D003605:D-Amino-Acid Oxidase