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- Title
Biosynthesis of Abscisic Acid by the Direct Pathway via Ionylideneethane in a Fungus, Cercospora cruenta.
- Authors
Inomata, Masahiro; Hirai, Nobuhiro; Yoshida, Ryuji; Ohigashi, Hajime
- Abstract
Examines the biosynthetic pathway of abscisic acid (ABA) after isopentenyl diphosphate in a fungus, Cercospora cruenta. Labeling of all oxygen atoms at C-1, -1, -1', and -4' of ABA produced by the fungus with [sup 18]O from [sup 18]O[sub 2]; Indication that the fungus did not produce the 9Z-carotenoid possessing gamma-ring that is likely a precursor for the carotenoid pathway, but produced new sesquiterpenoids along with 2E,4E,6E-allofarnesene; Fungus' conversion of the sesquiterpenoids labeled with [sup l3]C to ABA; Incorporation ratio of 2Z,4E-gamma-ionylideneethane was higher than that of 2E,4E-gamma- ionylideneethane; Conclusion that C. cruenta biosynthesized ABA by the direct pathway via oxidation of ionylideneethane with molecular oxygen following cyclization of allofarnesene; Consistency of the direct pathway via ionylideneethane in the fungus with that in Botrytis cinerea, except for the positions of double bonds in the rings of biosynthetic intermediates; Suggestion that the pathway is common among ABA- producing fungi.
- Subjects
ABSCISIC acid; CERCOSPORA; BIOSYNTHESIS; PYROPHOSPHATES; OXYGEN; OXIDATION; ATOMS; FUNGI; CAROTENOIDS
- Publication
Bioscience, Biotechnology & Biochemistry, 2004, Vol 68, Issue 12, p2571
- ISSN
0916-8451
- Publication type
Article
- DOI
10.1271/bbb.68.2571