Journal
FEBS LETTERS
Volume 579, Issue 11, Pages 2289-2293Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.febslet.2005.03.021
Keywords
photooxidative stress; chlorophyll antenna; photoprotection; stress protein; photosynthetic pigments; Synechocystis
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The products of the WAB operon are a chlorophyll antenna protein (IsiA) and flavodoxin (IsiB), which accumulate in cyanobacteria grown under iron starvation conditions. Here we show that strong light triggers de-repression of WAB transcription and leads to IsiA and flavodoxin accumulation under iron replete conditions. Genetic deletion of WAB resulted in a photosensitive phenotype, with accumulation of reactive oxygen species and cell bleaching in high light, while the Havodoxin-deficient isiB null mutant expressing isiA was phototolerant. We conclude that IsiA protects cyanobacteria from photooxidative stress. IsiA is the first example of a chlorophyll antenna protein outside the extended LHC family that is induced transiently by high light and that fulfills a photoprotective role. (c) 2005 Published by Elsevier B.V. on behalf of the Federation of European Biochemical Societies.
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