Protein processing as a regulatory mechanism in the synthesis of the photosynthetic antenna in Chloroflexus |
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Authors: | T E Redling R C Fuller |
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Institution: | (1) Department of Biochemistry, University of Massachusetts, 01003 Amherst, MA, USA |
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Abstract: | Chloroflexus aurantiacus can be induced to shift from respiratory to photosynthetic energy production by introducing light and/or lowering the oxygen concentration of a culture. After induction, cells synthesize bacteriochlorophyll and proteins for the formation of a functional photosynthetic apparatus. Bacteriochlorophyll is detectable within 2 h after induction. Chlorosome polypeptides are detected after 8–12 h. Two proteins, Mr 60,000 and Mr 47,000, are present in both induced and noninduced cells and react specifically with antibodies against chlorosome polypeptides. Immunological data suggest that these proteins (Mr 60,000 and 47,000) are polyproteins which are transcribed and translated in the dark. When cells are exposed to light or low oxygen tension these proteins are processed into functional polypeptides required in the assembly of the chlorosome. The reaction center polypeptide (Mr 26,000) appears to be part of a separate genetic control system.Dedicated to Prof. G. Drews on occasion of his 60th birthday |
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Keywords: | Chloroflexus Light-harvesting complexes Protein processing Polyproteins Bacteriochlorophyll |
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