Journal Article

Characterization of Complementary Chromatic Adaptation in <i>Gloeotrichia</i> UTEX 583 and Identification of a Transposon-like Insertion in the <i>cpeBA</i> Operon

Wilmer C. Stowe, Justin Brodie-Kommit and Emily Stowe-Evans

in Plant and Cell Physiology

Published on behalf of Japanese Society of Plant Physiologists

Volume 52, issue 3, pages 553-562
Published in print March 2011 | ISSN: 0032-0781
Published online February 2011 | e-ISSN: 1471-9053 | DOI: https://dx.doi.org/10.1093/pcp/pcr014
Characterization of Complementary Chromatic Adaptation in Gloeotrichia UTEX 583 and Identification of a Transposon-like Insertion in the cpeBA Operon

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Many cyanobacteria are able to alter the pigment composition of the phycobilisome in a process called complementary chromatic adaptation (CCA). The regulatory mechanisms of CCA have been identified in Fremyella diplosiphon, which regulates both phycoerythrin and phycocyanin levels, and Nostoc punctiforme, which regulates only phycoerythrin production. Recent studies show that these species use different regulatory proteins for CCA. We chose to study the CCA response of Gloeotrichia UTEX 583 in an effort to expand our knowledge about CCA and its regulation. We found that Gloeotrichia 583 has a CCA pigment response more similar to that of N. punctiforme rather than F. diplosiphon and exhibits none of the CCA-regulated morphological responses seen in F. diplosiphon. Preliminary experiments suggest that Gloeotrichia 583 contains a homolog to the CCA photoreceptor from N. punctiforme but not the CCA photoreceptor from F. diplosiphon. Additionally, two spontaneous mutants lacking phycoerythrin production were identified. Analysis has shown that these mutants contain a transposon-like insertion in the cpeA gene, which encodes the α subunit of phycoerythrin. These results suggest that CCA in Gloeotrichia UTEX 583 is more similar to that of N. punctiforme than it is to F. diplosiphon, a closely related species.

Keywords: complementary chromatic adaptation; cyanobacteria; Gloeotrichia UTEX 583

Journal Article.  6650 words.  Illustrated.

Subjects: Biochemistry ; Molecular and Cell Biology ; Plant Sciences and Forestry

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