Document Detail

Production, detection, and signaling of singlet oxygen in photosynthetic organisms.
MedLine Citation:
PMID:  23320833     Owner:  NLM     Status:  MEDLINE    
SIGNIFICANCE: In photosynthetic organisms, excited chlorophylls (Chl) can stimulate the formation of singlet oxygen ((1)O(2)), a highly toxic molecule that acts in addition to its damaging nature as an important signaling molecule. Thus, due to this dual role of (1)O(2), its production and detoxification have to be strictly controlled.
RECENT ADVANCES: Regulation of pigment synthesis is essential to control (1)O(2) production, and several components of the Chl synthesis and pigment insertion machineries to assemble and disassemble protein/pigment complexes have recently been identified. Once produced, (1)O(2) activates a signaling cascade from the chloroplast to the nucleus that can involve multiple mechanisms and stimulate a specific gene expression response. Further, (1)O(2) signaling was shown to interact with signal cascades of other reactive oxygen species, oxidized carotenoids, and lipid hydroperoxide-derived reactive electrophile species.
CRITICAL ISSUES: Despite recent progresses, hardly anything is known about how and where the (1)O(2) signal is sensed and transmitted to the cytoplasm. One reason for that is the limitation of available detection methods challenging the reliable quantification and localization of (1)O(2) in plant cells. In addition, the process of Chl insertion into the reaction centers and antenna complexes is still unclear.
FUTURE DIRECTIONS: Unraveling the mechanisms controlling (1)O(2) production and signaling would help clarifying the specific role of (1)O(2) in cellular stress responses. It would further enable to investigate the interaction and sensitivity to other abiotic and biotic stress signals and thus allow to better understand why some stressors activate an acclimation, while others provoke a programmed cell death response.
Beat B Fischer; Éva Hideg; Anja Krieger-Liszkay
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't; Review     Date:  2013-03-06
Journal Detail:
Title:  Antioxidants & redox signaling     Volume:  18     ISSN:  1557-7716     ISO Abbreviation:  Antioxid. Redox Signal.     Publication Date:  2013 Jun 
Date Detail:
Created Date:  2013-04-18     Completed Date:  2013-10-17     Revised Date:  2013-11-06    
Medline Journal Info:
Nlm Unique ID:  100888899     Medline TA:  Antioxid Redox Signal     Country:  United States    
Other Details:
Languages:  eng     Pagination:  2145-62     Citation Subset:  IM    
Department of Environmental Toxicology, Eawag, Swiss Federal Institute of Aquatic Science and Technology, Dübendorf, Switzerland.
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MeSH Terms
Cell Compartmentation
Photosystem II Protein Complex / metabolism
Plants / metabolism*
Signal Transduction*
Singlet Oxygen / metabolism*
Reg. No./Substance:
0/Photosystem II Protein Complex; 17778-80-2/Singlet Oxygen

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine

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