Photophosphorylation in isolated heterocysts from the blue-green alga Nostoc muscorum |
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Authors: | Helmar Almon Herbert Böhme |
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Affiliation: | Lehrstuhl für Physiologie und Biochemie der Pflanzen, Universität Konstanz, Postfach 5560, D-7750 Konstanz F.R.G. |
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Abstract: | Isolated heterocysts of the blue-green alga Nostoc muscorum (Anabaena 7119) exhibit high rates of photophosphorylation in systems with cyclic and non-cyclic electron transport. Cyclic photophosphorylation mediated by N-methylphenazonium methosulfate is found to be sensitive to antimycin A, but not to 2,5-dibromo-3-methyl-6-isopropyl-p-benzoquinon (DBMIB). Non-cyclic electron transport (diaminodurol → methylviologen) coupled to phosphorylation is affected by DBMIB, but not by antimycin A. Studies with uncouplers indicate that ΔpH is the main component of the protonmotive force under continuous illumination. A different effect of NH4Cl on dark- and photophosphorylation is observed and discussed with respect to localization of respiration in blue-green algae. |
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Keywords: | Electron transport Photophosphorylation Uncoupler Photosystem I (Cyanobacteria, Nostoc muscorum) CCCP FCCP DBMIB DCMU 3(3,4-dichllorophenyl)-1,1-dimethylurea PMS Tricine To whom correspondence should be addressed. |
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