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

Walter Oettmeier; Ralf Dostatni; Christoph Majewski; Gerhard Höfle; Thomas Fecker; Brigitte Kunze; Hans Reichenbach

doi:10.1515/znc-1990-0503

Open Access Published by De Gruyter June 2, 2014

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

Walter Oettmeier , Ralf Dostatni , Christoph Majewski , Gerhard Höfle , Thomas Fecker , Brigitte Kunze and Hans Reichenbach

From the journal Zeitschrift für Naturforschung C

https://doi.org/10.1515/znc-1990-0503

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.

: Photosystem II; Cytochrome b6/f-Complex; Cytochrome b/c1-Complex; Quinoline Antibiotics; Stigmatella aurantiaca

Received: 1989-11-9

Published Online: 2014-6-2

Published in Print: 1990-5-1

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 3.0 License.

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

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