Inhibition of photosynthetic electron transfer by amphotericin B |
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Authors: | DG Bishop |
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Institution: | Plant Physiology Unit, CSIRO Division of Food Research, and School of Biological Sciences, Macquarie University, North Ryde 2113, Sydney, Australia |
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Abstract: | The polyene antibiotic amphotericin B inhibits photosynthetic electron transfer by Class II maize mesophyll chloroplasts, from water to FeCN, DCIP and diquat but not to plastocyanin. Photosystem 1 activity is also inhibited by amphotericin B, but ferredoxin-NADP reductase activity is not affected. The activity of all the photosynthetic electron transfer systems inhibited by amphotericin B can be restored by the addition of carrier amounts of plastocyanin. The results suggest that amphotericin B inhibits photosynthetic electron transfer by acting only at the plastocyanin site in the chain, and that the primary site of reduction of FeCN and DCIP from water by Class II chloroplasts lies on the reducing side of photosystem 1. |
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Keywords: | DCIP 2 6-dichlorophenolindophenol DCMU 3-(3 4-dichlorophenyl)-1 1-dimethylurea Diquat 1 1′-ethylene-2 2′-dipyridylium dibromide DPCO 1 5-diphenylcarbazone FeCN ferricyanide MeV methyl viologen PC plastocyanin |
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