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Nitrogen status dependent oxidative stress tolerance conferred by overexpression of MnSOD and FeSOD proteins in Anabaena sp. strain PCC7120

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Abstract

The heterocystous nitrogen-fixing cyanobacterium, Anabaena sp. strain PCC7120 displayed two superoxide dismutase (SOD) activities, namely FeSOD and MnSOD. Prolonged exposure of Anabaena PCC7120 cells to methyl viologen mediated oxidative stress resulted in loss of both SOD activities and induced cell lysis. The two SOD proteins were individually overexpressed constitutively in Anabaena PCC7120, by genetic manipulation. Under nitrogen-fixing conditions, overexpression of MnSOD (sodA) enhanced oxidative stress tolerance, while FeSOD (sodB) overexpression was detrimental. Under nitrogen supplemented conditions, overexpression of either SOD protein, especially FeSOD, conferred significant tolerance against oxidative stress. The results demonstrate a nitrogen status-dependent protective role of individual superoxide dismutases in Anabaena PCC7120 during oxidative stress.

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Authors and Affiliations

  1. Molecular Biology Division, Bhabha Atomic Research Centre, Trombay, Mumbai, 400 085, India

    Prashanth S. Raghavan, Hema Rajaram & Shree K. Apte

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  1. Prashanth S. Raghavan
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  2. Hema Rajaram
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  3. Shree K. Apte
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Correspondence to Hema Rajaram.

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Raghavan, P.S., Rajaram, H. & Apte, S.K. Nitrogen status dependent oxidative stress tolerance conferred by overexpression of MnSOD and FeSOD proteins in Anabaena sp. strain PCC7120. Plant Mol Biol 77, 407 (2011). https://doi.org/10.1007/s11103-011-9821-x

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