Lesions in Phycoerythrin Chromophore Biosynthesis in Fremyella diplosiphon Reveal Coordinated Light Regulation of Apoprotein and Pigment Biosynthetic Enzyme Gene Expression

Richard M. Alvey, Jonathan A. Karty, Elicia Roos, James P. Reilly, David M. Kehoe

Research output: Journal ArticleArticlepeer-review


We have characterized the regulation of the expression of the pebAB operon, which encodes the enzymes required for phycoerythrobilin synthesis in the filamentous cyanobacterium Fremyella diplosiphon . The expression of the pebAB operon was found to be regulated during complementary chromatic adaptation, the system that controls the light responsiveness of genes that encode several light-harvesting proteins in F. diplosiphon . Our analyses of pebA mutants demonstrated that although the levels of phycoerythrin and its associated linker proteins decreased in the absence of phycoerythrobilin, there was no significant modulation of the expression of pebAB and the genes that encode phycoerythrin. Instead, regulation of the expression of these genes is coordinated at the level of RNA accumulation by the recently discovered activator CpeR.
Original languageAmerican English
JournalThe Plant Cell
StatePublished - Oct 1 2003
Externally publishedYes


  • Genetics
  • Biochemistry
  • Biology
  • Molecular Biology

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