title: Nonprotein amino acids from seeds of Cycas circinalis and Phaseolus vulgaris.
abstract: Our chemical studies on Cycas circinalis seeds from Guam has provided two new nonprotein amino acids, N-(3'-one-5'-methyl)-hexylalanine and leucine betaine. N-methylisoleucine, previously reported as a component of naturally occurring peptides, has been isolated as a free amino acid from the seeds of Phaseolus vulgaris (pinto bean), together with S-methylcysteine, pipecolic acid and a dipeptide, gamma-glutamyl-leucine.
authors.affiliation: Department of Botany, University of Texas at Austin 78713-7640, USA.
authors.forename: C J
authors.initials: CJ
authors.lastname: Li
authors.forename: D M
authors.initials: DM
authors.lastname: Brownson
authors.forename: T J
authors.initials: TJ
authors.lastname: Mabry
authors.forename: C
authors.initials: C
authors.lastname: Perera
authors.forename: E A
authors.initials: EA
authors.lastname: Bell
mesh_terms: D000409:Alanine / Q000031:analogs & derivatives / Q000032:analysis; D000596:Amino Acids / Q000032:analysis* / Q000737:chemistry; D001622:Betaine / Q000031:analogs & derivatives / Q000032:analysis; D003545:Cysteine / Q000031:analogs & derivatives / Q000032:analysis; D004151:Dipeptides / Q000032:analysis; D007887:Fabaceae; D007930:Leucine / Q000031:analogs & derivatives / Q000032:analysis; D009682:Magnetic Resonance Spectroscopy; D015394:Molecular Structure; D010455:Peptides / Q000737:chemistry; D010875:Pipecolic Acids / Q000032:analysis; D010946:Plants, Medicinal; D012639:Seeds / Q000737:chemistry
chemical_list: D000596:Amino Acids; D004151:Dipeptides; C100509:N-(5-methyl-3-oxohexyl)alanine; D010455:Peptides; D010875:Pipecolic Acids; C100510:leucine betaine; C100511:gamma-glutamyl-leucine; D001622:Betaine; C008425:S-methylcysteine; D007930:Leucine; C031345:pipecolic acid; D003545:Cysteine; D000409:Alanine