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
1990 Zeitschrift für Naturforschung C - A Journal of Biosciences  
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
more » ... hibitors 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.
doi:10.1515/znc-1990-0503 fatcat:bcfq74lo6feixpoqki4u5bynme