Characterization of manganese superoxide dismutase from a marine cyanobacterium Leptolyngbya valderiana BDU20041

  title={Characterization of manganese superoxide dismutase from a marine cyanobacterium Leptolyngbya valderiana BDU20041},
  author={Balakrishnan Priya and Reddi K Sivaprasanth and Vincent Dhivya Jensi and Lakshmanan Uma and Gopalakrishnan Subramanian and Dharmar Prabaharan},
  journal={Saline Systems},
  pages={6 - 6}
BackgroundCyanobacteria are recognized as the primordial organisms to grace the earth with molecular oxygen ~3.5 billion years ago as a result of their oxygenic photosynthesis. This laid a selection pressure for the evolution of antioxidative defense mechanisms to alleviate the toxic effect of active oxygen species (AOS) in cyanobacteria. Superoxide dismutases (SODs) are metalloenzymes that are the first arsenal in defense mechanism against oxidative stress followed by an array of antioxidative… 
Overexpression of Cu/Zn Superoxide Dismutase (Cu/Zn SOD) in Synechococcus elongatus PCC 7942 for Enhanced Azo Dye Removal through Hydrogen Peroxide Accumulation
The genetically engineered cyanobacterium Synechococcus elongatus PCC 7942 over-accumulated H2O2 during azo dye treatment with a higher dye removal rate than the wild-type strain (WS-sodC−).
Evolution of Superoxide Dismutases and Catalases in Cyanobacteria: Occurrence of the Antioxidant Enzyme Genes before the Rise of Atmospheric Oxygen.
Almost all cyanobacterial antioxidant enzymes emerged before or during the rise of atmospheric oxygen, and the loss and appearance of these enzymes in marine cyanobacteria may be also related to the change in the metal concentration induced by the increased oxygen concentration in the ocean.
Stress response in cyanobacteria
The major role of metal homeostasis in maintaining the intracellular concentration of metal within a range compatible with cell viability becomes evident.
Determination of Superoxide Dismutase Activities in Different Cyanobacteria for Scavenging of Reactive Oxygen Species
Spirulina platensis and Synechococcus nidulans are widely used cyanobacteria as food supplement and cosmetic due to their bioactive compounds and S. platensis was more efficient at scavenging peroxide radicals than Pseudanabeana sp.
Ecophysiology of the estuarine cyanobacterium Lyngbya aestuarii to varying salinity in vitro
Lyngbya aestuarii cope very well with the changing salinity in different seasons and grows well in the different sectors of the lagoon.
Ultraviolet radiation and cyanobacteria.
Laccases from Marine Organisms and Their Applications in the Biodegradation of Toxic and Environmental Pollutants: a Review
This review provides the latest information on laccases from marine environments, their sources, biochemical properties, media composition for laccase production, and their applications in the bioremediation of industrial waste, especially focusing on dye decolorization.


Comparative analysis of cyanobacterial superoxide dismutases to discriminate canonical forms
The present analysis unravels the ambiguity among cyanobacterial SOD isoforms and concludes that cyanobacteria harbor either Ni alone or a combination of Fe and Ni or Fe and Mn as their catalytic active metal while Cu/Zn is rare.
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
The results support the hypothesis that different SODs have specific protective functions within the cell, and suggest that another up-regulated antioxidant, possibly the MnSOD, may confer protection against NF in the sodB- strain.
Characterization of damage to photosystems I and II in a cyanobacterium lacking detectable iron superoxide dismutase activity.
Even though the sodB mutant was more sensitive to damage by active oxygen than wild-type cells, both strains were equally sensitive to the photoinhibition of photosystem II caused by exposure to strong light.
Storage of solar energy by production of hydrogen peroxide by the blue‐green alga Anacystis nidulans R2: Stimulation by azide
H2O2 production appears to be limited mainly because of decomposition by catalase activity rather than by the photosynthetic electron flow rate or the diffusion of products through the cell wall, which means the photosystem can be a useful tool in the storage of solar energy.
Laccase and polyphenol oxidase activities of marine cyanobacteria: a study with Poly R-478 decolourization
The study revealed the presence of laccases (LACs) and polyphenol oxidases (PPOs) in marine cyanobacteria and found strains that possess both LACs and PPOs were relatively more efficient in decolourizing the dye.
Reactive oxygen species and UV-B: effect on cyanobacteria.
  • Yuying He, D. Häder
  • Chemistry, Environmental Science
    Photochemical & photobiological sciences : Official journal of the European Photochemistry Association and the European Society for Photobiology
  • 2002
The efficient defense and repair system allows cyanobacteria to recover from the oxidative damage under moderate UV-B irradiation, and the following methods are discussed: the fluorogenic probe 2',7'-dichlorodihydrofluorescein diacetate (DCFH-DA) and thiobarbituric acid reactive substances (TBARS), used to determine lipid peroxidation in cyanob bacteria.