Bioscience, Biotechnology, and Biochemistry
Online ISSN : 1347-6947
Print ISSN : 0916-8451
Identification of a New Brassinosteroid, Cathasterone, in Cultured Cells of Catharanthus roseus as a Biosynthetic Precursor of Teasterone
Shozo FujiokaTomo InoueSuguru TakatsutoTadashi YanagisawaTakao YokotaAkira Sakurai
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1995 Volume 59 Issue 8 Pages 1543-1547


The occurrence of a new brassinosteroid of (22S, 24R)-3β, 22-dihydroxy-5α-ergostan-6-one, named cathasterone, was demonstrated by a GC-MS analysis in cultured cells of Catharanthus roseus. Its endogenous level was in the range of 2-4ng/g fw, similar to those of brassinolide and castasterone. A feeding experiment with a deuterium-labeled substrate revealed that cathasterone was converted to teasterone and typhasterol. This is the first report of the natural occurrence of cathasterone as a brassinosteroid being the biosynthetic precursor of teasterone.

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