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 2–4 ng/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.
通过气相色谱-质谱(GC-MS)分析,证明了一种新的黄
铜内酯(22S,24R)-3β,22-二羟基-5α-麦角甾-6-酮,名为卡司他酮,存在于石竹属植物的培养细胞中。其内源性
水平在 2-4 纳克/克脂重之间,与黄
铜内酯和卡司他酮的内源性
水平相似。使用
氘标记底物进行的喂食实验显示,卡巴司酮会转化为茶甾酮和酪
甾醇。这是首次报道作为茶甾酮
生物合成前体的黄
铜内酯自然存在的卡他
雄酮。