A cyanobacterium lacking iron superoxide dismutase is sensitized to oxidative stress induced with methyl viologen but Is not sensitized to oxidative stress induced with norflurazon

Plant Physiology
D J ThomasStephen K Herbert

Abstract

A strain of Synechococcus sp. strain PCC 7942 with no functional Fe superoxide dismutase (SOD), designated sodB-, was characterized by its growth rate, photosynthetic pigments, and cyclic photosynthetic electron transport activity when treated with methyl viologen or norflurazon (NF). In their unstressed conditions, both the sodB- and wild-type strains had similar chlorophyll and carotenoid contents and catalase activity, but the wild type had a faster growth rate and higher cyclic electron transport activity. The sodB- was very sensitive to methyl viologen, indicating a specific role for the FeSOD in protection against superoxide generated in the cytosol. In contrast, the sodB- mutant was less sensitive than the wild type to oxidative stress imposed with NF. This suggests that the FeSOD does not protect the cell from excited singlet-state oxygen generated within the thylakoid membrane. Another up-regulated antioxidant, possibly the MnSOD, may confer protection against NF in the sodB- strain. These results support the hypothesis that different SODs have specific protective functions within the cell.

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Citations

Mar 16, 2000·Plant Science : an International Journal of Experimental Plant Biology·S JungB G Kang
Feb 16, 2005·Astrobiology·David J ThomasShawn M Zimmerman
Feb 16, 2005·Astrobiology·David J Thomas, Stephen K Herbert
Mar 12, 2004·Annual Review of Plant Physiology and Plant Molecular Biology·Kozi Asada
Nov 29, 2007·BMC Genomics·Balakrishnan PriyaGopalakrishnan Subramanian
Apr 5, 2014·Biological Trace Element Research·Geeta YadavSheo Mohan Prasad
Nov 28, 2013·Biochimica Et Biophysica Acta·Kaisa HakkilaTaina Tyystjärvi
Apr 16, 2015·Environmental Science and Pollution Research International·Muhammad AdreesSaima Aslam Bharwana
May 9, 2014·Biophysical Journal·Shigeharu KiharaSergei Savikhin
Sep 24, 2013·Applied and Environmental Microbiology·Josefine AnfeltElton P Hudson
Jan 22, 2018·Applied Microbiology and Biotechnology·Rebecca L Kitchener, Amy M Grunden
Oct 24, 2007·Applied and Environmental Microbiology·Christopher L DupontBrian Palenik
Mar 27, 2003·Photochemical & Photobiological Sciences : Official Journal of the European Photochemistry Association and the European Society for Photobiology·Yu-Ying He, DonatP Häder
Mar 12, 1999·Journal of Bacteriology·M Tichy, W Vermaas
Jun 21, 2005·Plant Physiology·Hiroshi MaedaDean Dellapenna
Nov 17, 2010·Biochimica Et Biophysica Acta·Marinus PilonWiebke Tapken

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