Biosci Biotechnol Biochem. 1996 Jan;60(5):750-4. doi: 10.1271/bbb.60.750.
Conformational Analysis of Abscisic Acid Analogs Produced by Cercospora cruenta.
Bioscience, biotechnology, and biochemistry
H Yamamoto, T Sugiyama, T Oritani
Affiliations
Affiliations
- a Department of Applied Biological Chemistry, Faculty of Agriculture , Tohoku University , 1-1 Tsutsumidori-Amamiyamachi, Aoba-ku, Sendai 981 , Japan.
PMID: 27281136
DOI: 10.1271/bbb.60.750
Abstract
The conformation of hydroxy-γ-ionylideneacetic acids produced by Cercospora cruenta was examined by 'H-NMR analysis. (1)H-(1)H COSY and NOE data indicated that (2Z,4E,1'R,4'#)-4'-hydroxy-(γ)- ionylideneacetic acid has a cyclohexane ring of chair form furnishing a hydroxyl group and a 2,4-pentadienoic acid moiety, each with equatorial orientation, while (2Z,4E,1'S,3'S)-3'-hydroxy-γ-ionylideneacetic acid has a flexible twisted-boat form of cyclohexane ring. It is suggested that the structure of another (2Z,4E,1'S,4'R)-isomer of 4'-hydroxy-γ-ionylideneacetic acid with an equatorial hydrogen at the l'-position is the key for further oxygenation to abscisic acid.
Keywords: (2Z,4E, 1′R,4′R)-4′-hydroxy-γ-ionylideneacetic acid; (2Z,4E,1’S,3′S)-3′-hydroxy-γ-ionylideneacetic acid; Cercospora cruenta
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