NDLI: Comparison of three Chlamydomonas strains which show distinctive oxidative stress tolerance.

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Comparison of three Chlamydomonas strains which show distinctive oxidative stress tolerance.

Content Provider	World Health Organization (WHO)-Global Index Medicus
Author	Tanaka, Satoshi Ikeda, Kazunori Miyasaka, Hitoshi Shioi, Yuzo Suzuki, Yoshimi Tamoi, Masahiro Takeda, Toru Shigeoka, Shigeru Harada, Kazuo Hirata, Kazumasa
Description	Country affiliation: Japan Author Affiliation: Tanaka S ( The Kansai Electric Power Co., Environmental Research Center, Keihanna-Plaza, Hikaridai 1-7, Seikacho, Sourakugun, Kyoto 619-0237, Japan.)
Abstract	Methyl viologen (MV) causes severe oxidative stress by generating superoxide in the photosystem. The marine Chlamydomonas strain W80 is highly tolerant to MV (inhibitory concentration 50% [IC50]=110 µM), and another marine Chlamydomonas strain HS5 shows also relatively a high tolerance (IC50=12 µM). These two marine strains and a freshwater Chlamydomonas reinhardtii, which is highly sensitive to MV (IC50=0.03 µM), were compared with respect to their reactive oxygen species (ROS) eliminating enzymes (superoxide dismutase, catalase, glutathione peroxidase, and ascorbate peroxidase), intracellular free amino acids, and antioxidant activities of the cell extracts. The marked difference between the marine Chlamydomonas strains and C. reinhardtii is the much higher (more than 5 fold) ascorbate peroxidase (APX) activity in the marine strains. The marine strains also kept the high APX activities (more than 100% of non-stressed condition) under the MV stressed condition, while the APX activity in C. reinhardtii was significantly decreased (36% of non-stressed condition) under the stressed condition, indicating that APX activity potentially contributes to the oxidative stress tolerance in Chlamydomonas. In addition, the levels of intracellular free proline, which is supposed to ameliorate oxidative stress, were several tens of times higher in the marine Chlamydomonas strains than in C. reinhardtii.
File Format	HTM / HTML
ISSN	13891723
Issue Number	5
Volume Number	112
e-ISSN	13474421
Journal	Journal of Bioscience and Bioengineering
Language	English
Publisher	Elsevier
Publisher Date	2011-11-01
Publisher Place	Japan
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Discipline Biomedical Engineering Discipline Microbiology Chlamydomonas Reinhardtii Metabolism Chlamydomonas Fresh Water Microbiology Seawater Animals Ascorbate Peroxidases Catalase Classification Enzymology Chlorophyll Glutathione Peroxidase Oxidation-reduction Oxidative Stress Paraquat Pharmacology Peroxidases Reactive Oxygen Species Superoxide Dismutase Comparative Study Journal Article
Content Type	Text
Resource Type	Article
Subject	Bioengineering Applied Microbiology and Biotechnology Biotechnology

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