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Spectral response curves for the formation of phycobili proteins chlorophyll and delta amino levulinic acid in cyanidium caldarium


, : Spectral response curves for the formation of phycobili proteins chlorophyll and delta amino levulinic acid in cyanidium caldarium. Zeitschrift fuer Pflanzenphysiologie 94(5): 449-459

Spectral response curves for the formation of phycobiliproteins and the chlorophyll both show maxima at 440, 575 and 645 nm in cells of the wild-type mutant III-D-2 of C. caldarium. Chlorophyll formation occurs maximally in about 460 and 645 nm light in the phycobiliprotein-less mutant III-C. The chlorophyll-less mutant GGB forms phycobiliproteins maximally when illuminated with 440 nm light and a much smaller response peak occurs at 575 nm. Apparently, there is one photoreceptor-biosynthetic system for chlorophyll formation and another for phycobiliprotein production. One is defective in GGB and another in III-C. In the wild-type-like mutant III-D-2, where spectral response curves for the 2 classes of tetrapyrrolic pigments are qualitatively indistinguishable, the 2 biosynthetic paths may be linked through common intermediates whose synthesis is regulated by light. The synthesis of .delta.-aminolevulinic acid (ALA) is maximally promoted by about the same wavelengths of light which stimulate chlorophyll or phycobiliprotein synthesis. This spectral similarity may be caused by removal of feedback inhibitors or by a synchronous formation of various pigment synthesizing enzymes. Glucose represses ALA and chlorophyll formation in dark-green cells of strain II-D-2. These compounds form in darkness after heterotrophically grown cells are washed free of glucose. However, the cells produce no phycobiliproteins in darkness regardless of whether or not glucose is present. Together with results from other experiments, this observation implies that phycobiliprotein formation requires control mechanisms besides the regulation of ALA synthesis.

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