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Metabolic Transformation of the Brassinosteroid 24-Epi-castasterone by the Cockroach Periplaneta americana

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Metabolic Transformation of the Brassinosteroid

24-Epi-castasterone by the Cockroach Periplaneta americana

Jürgen Schmidt

a,

*, Klaus Richter

b

, Brunhilde Voigt

a

and Günter Adam

a

a Leibniz-Institut für Pflanzenbiochemie, Abteilung Naturstoffchemie, Weinberg 3, D-06120 Halle/S., Germany. Fax: 0345Ð5582166. E-mail: jschmidt@ipb.uni-halle.de

b Sächsische Akademie der Wissenschaften, Forschungsgruppe Jena, Neugasse 23, D-07743 Jena, Germany

* Author for correspondence and reprint request

Z. Naturforsch.55c, 233Ð239 (2000); received November 2/November 29, 1999 Periplaneta americana,Brassinosteroids, Metabolic Transformation

After feeding of 24-epi-castasterone to the cockroach Periplaneta americana an organ- specific epimerization of the brassinosteroid to 2,24-diepi-castasterone could be detected in female insects. The metabolite being observed only in the ovaries and not in the testes of the insect was identified by GC/MS in comparison with a synthesized authentic sample. Con- trary, 24-epi-brassinolide is not metabolized in the sexual organs ofPeriplaneta americana.

This is the first evidence of a metabolic transformation of a brassinosteroid in insects.

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