Redox chain and energy transduction in chromatophores from Rhodopseudomonas capsulata cells grown anaerobically in the dark on glucose and dimethyl sulfoxide |
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Authors: | D Zannoni BL Marrs |
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Institution: | 1. Institute of Botany, University of Bologna, BolognaItaly;2. Department of Biochemistry, St. Louis University School of Medicine, St. Louis, MOU.S.A. |
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Abstract: | Membranes from cells of Rhodopseudomonas capsulata grown anaerobically in the dark on glucose plus dimethyl sulfoxide differ from those obtained from photoheterotrophically grown cells in several ways: (a) there are qualitative and quantitative variations in the cytochrome composition; (b) electron-transport rates are unusually low in the cytochrome b to cytochrome c region; (c) light-induced ATP synthesis is dependent on the ability of the alternate respiratory pathway to maintain the Q10-cytochrome b complex in a partially oxidized state; (d) a non-energy-conserving NADH-dehydrogenase activity dominates the respiratory activity. In addition, data obtained with both wild-type and mutant cells that contain altered electron-transport systems tend to exclude a role of the redox chain as ATP-producing machinery during anaerobic/dark growth. |
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Keywords: | Electron transport Photophosphorylation Redox chain Photosynthetic membrane NADH dehydrogenase (Rps capsulata) DMSO dimethyl sulfoxide DCIP dichlorophenolindophenol TMPD trimethylphenylenediamine BChl bacteriochlorophyll Mes 4-morpholineethanesulfonic acid |
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