期刊
PLANT CELL AND ENVIRONMENT
卷 36, 期 6, 页码 1204-1213出版社
WILEY
DOI: 10.1111/pce.12053
关键词
EPR spin trapping; signalling
资金
- Agence Nationale de Recherche [ANR-09-BLAN-0005-01]
- EU FP7 Marie Curie Initial Training Network HARVEST [238017]
- Agence Nationale de la Recherche (ANR) [ANR-09-BLAN-0005] Funding Source: Agence Nationale de la Recherche (ANR)
In photosynthetic organisms, excess light is a stress that induces production of reactive oxygen species inside the chloroplasts. As a response, the capacity of antioxidative defence mechanisms increases. However, when cells of Chlamydomonas reinhardtii were shifted from dark to high light, a reversible partial inactivation of catalase activity was observed, which correlated with a transient increase in the level of H2O2 in the 10m range. This concentration range seems to be necessary to activate H2O2-dependent signalling pathways stimulating the expression of H2O2 responsive genes, such as the heat shock protein HSP22C. Catalase knock-down mutants had lost the transient accumulation of H2O2, suggesting that a decrease in catalase activity was the key element for establishing a transient H2O2 burst. Catalase was inactivated by a one-electron event consistent with the reduction of a single cysteine. We propose that under high light intensity, the redox state of the photosynthetic electron transport chain is sensed and transmitted to the cytosol to regulate the catalase activity. This allows a transient accumulation of H2O2, inducing a signalling event that is transmitted to the nucleus to modulate the expression of chloroplast-directed protection enzymes.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据