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Photosynth Res. 2013 Oct 10; doi: 10.1007/s11120-013-9929-8. Epub 2013 Oct 10.

Oxidative stress management in the filamentous, heterocystous, diazotrophic cyanobacterium, Anabaena PCC7120.

Photosynthesis research

Manisha Banerjee, Prashanth S Raghavan, Anand Ballal, Hema Rajaram, S K Apte

Affiliations

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

PMID: 24122336 DOI: 10.1007/s11120-013-9929-8

Abstract

Reactive oxygen species (ROS) are inevitably generated as by-products of respiratory/photosynthetic electron transport in oxygenic photoautotrophs. Unless effectively scavenged, these ROS can damage all cellular components. The filamentous, heterocystous, nitrogen-fixing strains of the cyanobacterium, Anabaena, serve as naturally abundant contributors of nitrogen biofertilizers in tropical rice paddy fields. Anabaena strains are known to tolerate several abiotic stresses, such as heat, UV, gamma radiation, desiccation, etc., that are known to generate ROS. ROS are detoxified by specific antioxidant enzymes like superoxide dismutases (SOD), catalases and peroxiredoxins. The genome of Anabaena PCC7120 encodes two SODs, two catalases and seven peroxiredoxins, indicating the presence of an elaborate antioxidant enzymatic machinery to defend its cellular components from ROS. This article summarizes recent findings and depicts important perspectives in oxidative stress management in Anabaena PCC7120.

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