Abstract
A screening method was developed for the detection of enzymes converting loganin to secologanin, a precursor in the biosynthesis of indole alkaloids. The method uses a transgenic yeast culture expressing two cDNAs encoding enzymes involved in the terpenoid indole alkaloid biosynthesis. In the presence of secologanin, the yeast culture produces a yellow compound visible on nitrocellulose. This color change was used to screen a cDNA library of Catharanthus roseus for a putative enzyme converting loganin into secologanin.
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