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First published online September 24, 2003; 10.1105/tpc.015016

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The Plant Cell, Vol. 15, 2448-2463, October 2003, Copyright © 2003,
American Society of Plant Biologists

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

Richard M. Alveya, Jonathan A. Kartyb, Elicia Roosa, James P. Reillyb and David M. Kehoe1,a

a Department of Biology, Indiana University, Bloomington, Indiana 47405
b Department of Chemistry, Indiana University, Bloomington, Indiana 47405

1 To whom correspondence should be addressed. E-mail dkehoe{at}bio.indiana.edu; fax 812-855-6705

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.




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