The Aurachins, Naturally Occurring Inhibitors of Photosvnthetic Electron Flow through Photosystem II and the Cytochrome b6/f-Complex

Author:

Oettmeier Walter1,Dostatni Ralf1,Majewski Christoph1,Höfle Gerhard2,Fecker Thomas2,Kunze Brigitte2,Reichenbach Hans2

Affiliation:

1. Lehrstuhl Biochemie der Pflanzen. Ruhr-Universität, Postfach 102148, D-4630 Bochum 1. Bundesrepublik Deutschland

2. Gesellschaft für Biotechnologischc Forschung mbH. Maschcroder Weg 1, D-3300 Braunschweig. Bundesrepublik Deutschland

Abstract

A third group of antibiotics, the aurachins, have been isolated from the myxobacterium Stigmatella aurantiaca. The aurachins chemically are quinolones. and four of them (aurachins A-D) have been tested for their inhibitory activity in photosystem II and cytochrome b/c-complexes. Aurachin C is the best inhibitor in photosystem II (pI50-value 7.2); its biochemical behaviour being the same like that of other photosystem II herbicides. Both aurachins C and D are also excellent inhibitors in the cytochrome b6/f-complex (pI50-values of 7.00 and 7.49. respectively). In its mechanism of action, aurachin C resembl|es antimycin, whereas aurachin D is different from either antimycin or myxothiazol.

Publisher

Walter de Gruyter GmbH

Subject

General Biochemistry, Genetics and Molecular Biology

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