Down‐regulation of catalase activity allows transient accumulation of a hydrogen peroxide signal in   C hlamydomonas reinhardtii | Zendy

MICHELET LAURE | Zendy; ROACH THOMAS | Zendy; FISCHER BEAT B. | Zendy; BEDHOMME MARIETTE | Zendy; LEMAIRE STÉPHANE D. | Zendy; KRIEGERLISZKAY ANJA | Zendy

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Down‐regulation of catalase activity allows transient accumulation of a hydrogen peroxide signal in C hlamydomonas reinhardtii

Author(s) -

MICHELET LAURE,

ROACH THOMAS,

FISCHER BEAT B.,

BEDHOMME MARIETTE,

LEMAIRE STÉPHANE D.,

KRIEGERLISZKAY ANJA

Publication year - 2013

Publication title -

plant, cell and environment

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 2.646

H-Index - 200

eISSN - 1365-3040

pISSN - 0140-7791

DOI - 10.1111/pce.12053

Subject(s) - catalase , chlamydomonas reinhardtii , hydrogen peroxide , reactive oxygen species , biophysics , oxidative stress , chemistry , biochemistry , chloroplast , microbiology and biotechnology , photoprotection , photosynthesis , cytosol , enzyme , mutant , biology , gene

We provide evidence that a floodgate mechanism of ROS signalling that had been proposed to occur in mammalian cells may also take place in C hlamydomonas reinhardtii . When cells of C . reinhardtii were shifted from dark to high light, a transient increase in the level of hydrogen peroxide was observed which correlated with a reversible partial inactivation of catalase activity. This transient increase in the H 2 O 2 level seems to allow to activate H 2 O 2 ‐dependent signaling pathways since changes in the expression level of H 2 O 2 responsive genes such as HSP 22C tightly followed the peak of H 2 O 2 .

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