1977
DOI: 10.1016/0378-1097(77)90168-9
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A proteolytic enzyme degrading phycocyanin in the cyanobacterium Anabaena cylindrica

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Cited by 15 publications
(15 citation statements)
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“…These reserves consist of the major light-harvesting pigments phycocyanin and phycoerythrin, constituting up to 50% of total cell protein (Glazer, 1987 ;Tandeau de Marsac & Houmard, 1993), and cyanophycin, a copolymer of arginine and aspartic acid that is unique to cyanobacteria (Simon, 1987). During periods of N # starvation in Anabaena spp., phycocyanin is degraded by a specific protease, phycocyaninase (Foulds & Carr, 1977 ;Wood & Haselkorn, 1980 ;Thiel, 1990), and phycocyanin gene expression is switched off, probably as a result of transcriptional regulation (Johnson et al, 1988 ;Wealand et al, 1989). The enzymes for cyanophycin synthesis and breakdown are more active in Anabaena heterocysts than in vegetative cells (Gupta & Carr, 1981), prompting the speculation that cyanophycin may serve as a dynamic reservoir of newly assimilated N that can be used for biosynthesis (Carr, 1988).…”
Section: Heterocyst Developmentmentioning
confidence: 99%
“…These reserves consist of the major light-harvesting pigments phycocyanin and phycoerythrin, constituting up to 50% of total cell protein (Glazer, 1987 ;Tandeau de Marsac & Houmard, 1993), and cyanophycin, a copolymer of arginine and aspartic acid that is unique to cyanobacteria (Simon, 1987). During periods of N # starvation in Anabaena spp., phycocyanin is degraded by a specific protease, phycocyaninase (Foulds & Carr, 1977 ;Wood & Haselkorn, 1980 ;Thiel, 1990), and phycocyanin gene expression is switched off, probably as a result of transcriptional regulation (Johnson et al, 1988 ;Wealand et al, 1989). The enzymes for cyanophycin synthesis and breakdown are more active in Anabaena heterocysts than in vegetative cells (Gupta & Carr, 1981), prompting the speculation that cyanophycin may serve as a dynamic reservoir of newly assimilated N that can be used for biosynthesis (Carr, 1988).…”
Section: Heterocyst Developmentmentioning
confidence: 99%
“…(34), Anabaena (11,33), Synechococcus strain PCC 7002 (28), and Synechocystis strain PCC 6803 (10). The resulting decrease in chlorophyll and phycobilisome (PBS) content leads to a dramatic change in cell color from the normal blue-green to yellow-green, which is known as bleaching or chlorosis.…”
mentioning
confidence: 99%
“…Thus, the lack of new phycobiliprotein synthesis appears to result from regulation at the mRNA level. The degradation of preexisting phycobiliproteins is due to the action of proteases which appear during nitrogen starvation (13,40) and whose genes are also apparently regulated by nitrogen starvation.…”
Section: Discussionmentioning
confidence: 99%
“…carbon; during periods of nitrogen starvation, cyanobacteria degrade almost all their phycobiliproteins (2). The activity of a phycobiliprotein-specific protease increases substantially during the first few hours of nitrogen starvation (13,40). In nitrogen-fixing cyanobacteria, phycobiliprotein degradation can provide the amino acids needed to synthesize nitrogenase and other proteins for fixing nitrogen.…”
mentioning
confidence: 99%