Phytochemistry p. 1011 - 1016 (1981)
Update date:2022-07-29
Topics:
Hedden, Peter
Graebe, Jan E.
A new product obtained by incubation of <2-14C>-mevalonic acid with a cell-free system from Cucurbita maxima endosperm was identified by GC-MS as ent-kaura-6,16-dien-19-oic acid.When this compound was reincubated with the microsomal fraction it was converted to 7β-hydroxykaurenolide and hence to 7β,12α-dihydroxykaurenolide.The dienoic acid was also obtained by incubation of ent-kaurene, ent-kaurenol, ent-kaurenal and ent-kaurenoic acid, but not ent-7α-hydroxykaurenoic acid, with the microsomal fraction.Thus, in the C. maxima cell-free system, the kaurenolides are formed by a pathway which branches from the GA pathway at ent-kaurenoic acid and proceeds via the dienoic acid.Key Word Index- Cucurbita maxima; Cucurbitaceae; biosynthesis; cell-free system; kaurenolides; gibberellins; ent-kaura-6,16-dien-19-oic acid.
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