Abstract

The conversion of 23-nor-5,20(22) E-choladienic acid-3β-ol and other intermediates of the putative norcholanic acid pathway of cardenolide biosynthesis by recombinant 3β-hydroxysteroid dehydrogenase from Digitalis lanata in dehydrogenation and reduction reactions was investigated. 23-nor-4,20(22) E-choladienic acid-3-one was found to be a substrate of recombinant progesterone 5β-reductases from D. lanata and Arabidopsis thaliana. The role of various substrates in cardenolide biosynthesis is discussed.

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