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Lowering of oxygen partial pressure in chemotrophic cultures or reduction of light intensity in phototrophic cultures ofRhodopseudomonas capsulata induced formation of the photosynthetic apparatus. A maximum of mRNA coding for the reaction center (RC) and the light-harvesting 1 B870 antenna complex polypeptides occurred 30 min after induction. Maximal expression of mRNA for B800-B850 antenna proteins appeared with a lag time of about 25 min after RC/B870 mRNA. Pigment-binding polypeptides were inserted into the membrane immediately after mRNA synthesis. It is concluded that the delayed formation of the B800-B850 complex compared to the RC and the B870 complex is caused by sequential expression of the corresponding genes. Biological activity of pigment-protein complexes increased after the incorporation of their polypeptides parallel to the maximum of bacteriochlorophyll synthesis. Studies on mutant strains defective in the formation of pigment-protein complexes suggested that pigment synthesis is of importance for assembly of stable complexes.

proceedings of the national academy of sciences of the united states of america

Gene expression of pigment-binding proteins of the bacterial photosynthetic apparatus: Transcription and assembly in the membrane of <i>Rhodopseudomonas capsulata</i>

Gene expression of pigment-binding proteins of the bacterial photosynthetic apparatus: Transcription and assembly in the membrane of Rhodopseudomonas capsulata