Chromatic adaptation in a mutant of Fremyella diplosiphon incapable of phycoerythrin synthesis |
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Authors: | S Beguin G Guglielmi R Rippka G Cohen-Bazire |
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Institution: | Unité de Physiologie Microbienne, Département de Biochimie et Génétique Moléculaire - C.N.R.S.-E.R.A. 398 - Institut Pasteur, 28, rue du Docteur Roux, 75724 Paris Cedex 15, France |
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Abstract: | A mutant of the chromatically adapting cyanobacterium Fremyella diplosiphon, incapable of phycoerythrin synthesis but responding to wavelength modulation of its biliprotein content, was isolated. The biliprotein composition of the mutant and of the wild type were identical after growth in red light, but green light induced, in the mutant, the synthesis of a biliviolin-type chromophore bound to some of the alpha subunits of its phycocyanin. Implications of the results on the regulation and possible pathways of biliprotein biosynthesis are discussed. |
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Keywords: | cyanobactérie adaptation chromatique phycobiliprotéines chromophores cyanobacterium chromatic adaptation phycobiliproteins chromophores AP allophycocyanin PC phycocyanin PE phycoerythrin PEC phycoerythrocyanin PCB phycocyanobilin PEB phycoerythrobilin PXB phycobiliviolin-type chromophore of unknown structure SDS sodium dodecyl sulfate β-SH β-mercaptoethanol |
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