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DOI: 10.1055/s-2002-34935
© Georg Thieme Verlag Stuttgart · New York
A Newly-Detected Reductase from Rauvolfia Closes a Gap in the Biosynthesis of the Antiarrhythmic Alkaloid Ajmaline
Publikationsverlauf
Received: January 10, 2002
Accepted: May 11, 2002
Publikationsdatum:
21. Oktober 2002 (online)
![](https://www.thieme-connect.de/media/plantamedica/200210/lookinside/thumbnails/10.1055-s-2002-34935-1.jpg)
Abstract
A new enzyme, 1,2-dihydrovomilenine reductase (E.C. 1.3.1), has been detected in Rauvolfia cell suspension cultures. The enzyme specifically converts 2β(R)-1,2-dihydrovomilenine through an NADPH-dependent reaction into 17-O-acetylnorajmaline, a close biosynthetic precursor of the antiarrhythmic alkaloid ajmaline from Rauvolfia. A five-step purification procedure using SOURCE 30Q chromatography, hydroxyapatite chromatography, 2′,5′-ADP Sepharose 4B affinity chromatography and ion exchange chromatography on DEAE Sepharose and Mono Q delivered a ∼ 200-fold enriched enzyme in a yield of ∼ 6 %. SDS-PAGE showed an Mr for the enzyme of ∼ 48 kDa. Optimum pH and optimum temperature of the reductase were at pH 6.0 and 37 °C. The enzyme shows a limited distribution in cell cultures expressing ajmaline biosynthesis, and is obviously highly specific for the ajmaline pathway.
Key words
Rauvolfia serpentina Benth. ex Kurz - Apocynaceae - cell suspension culture - 1,2-dihydrovomilenine reductase - ajmaline biosynthesis
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1 Shujuan Gao and Gerald von Schumann have contributed equally to this study.
Prof. Dr. J. Stöckigt
Department of Pharmaceutical Biology
Institute of Pharmacy
Johannes Gutenberg-University
Staudinger Weg 5
55099 Mainz, Germany
eMail: stoeckig@mail.uni-mainz.de
Telefon: +49-(0)6131-39-25751
Fax: +49-(0)6131-39-23752