Abstract

Tropinone constitutes an important metabolite at the branching point of tropane alkaloid biosynthesis. Either tropinone is reduced to tropine by tropinone reductase I (TRI) leading to the formation of tropane alkaloids, or tropinone reductase II (TRII) forms the stereoisomer pseudotropine, precursor of calystegines. Potato (Solanum tuberosum) contains tropinone, accumulates calystegines but no tropane alkaloids. Nevertheless, the potato genome contains coding sequences for both kinds of tropinone reducing enzymes.

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