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Query: faculty: "FNWI" and publication year: "2005"

AuthorsM. Havaux, G. Guedeney, M. Hagemann, N. Yeremenko, H.C.P. Matthijs, R. Jeanjean
TitleThe chlorophyll-binding protein IsiA is inducible by high light and protects the cyanobacterium Synechocystis PCC6803 from photooxidative stress
JournalFEBS Letters
Volume579
Year2005
Pages2289-2293
ISSN00145793
FacultyFaculty of Science
Institute/dept.FNWI: Institute for Biodiversity and Ecosystem Dynamics (IBED)
KeywordsPhotooxidative stress; Photoprotection; Stress protein; Synechocystis; Photosynthetic pigments
Classification42.35
AbstractThe products of the IsiAB 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 IsiAB transcription and leads to IsiA and flavodoxin accumulation under iron replete conditions. Genetic deletion of IsiAB 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.
Document typeArticle
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