ISSN:
1618-2545
Keywords:
Amanita gymnopus
;
(2S)-2-amino-5-chloro-4-hydroxy-5-hexenoic acid
;
(2S)-2-amino-5-hexynoic acid
;
(2S)-2-amino-5-hexynoic acid
;
non-protein amino acids
Source:
Springer Online Journal Archives 1860-2000
Topics:
Biology
Notes:
Abstract Combining different chromatography systems, unusual nonprotein amino acids were isolated and unequivocally identified from a small amount (less than 100 g fresh weight) ofAmanita gymnopus fruit body. Without obtaining crystals of these amino acids, on the basis of1H-NMR determination, high resolution mass spectrometry, chlorine analysis and oxidation with L-amino acid oxidase, one of them proved to be a new chloroamino acid, (2S)-2-amino-5-chloro-4-hydroxy-5-hexenoic acid (G2). The other three were (2S)-2-amino-5-hexenoic acid (G1), (2S)-2-amino-4,5-hexadienoic acid (G3) and (2S)-2-amino-5-hexynoic acid (G4). Amino acid (G1) was also encountered for the first time in natural products. Amino acid (G3) has been reported from several kinds of fungi belonging toAmanita, subgenusLepidella. The occurrence of amino acid (G4) was already reported fromCortinarius claricolor.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF02268510
Permalink
