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Pro-oxidant action of phloxine B on fission yeast Schizosaccharomyces pombe.

A Schizosaccharomyces pombe mutant deficient in Cu,Zn-superoxide dismutase (sod1 mutant) was hypersensitive to phloxine B, which is used as a food-colouring agent and also to distinguish diploid strains of Sz. pombe from haploid strains, under illumination with light. The pro-oxidant nature of phloxine B was confirmed biochemically. The carbonyl content of proteins (which represents protein oxidation) increased, and the reduced form of glutathione was transiently decreased by phloxine B treatment under illumination with light. When cells were treated with phloxine B under light, carbonyl content of proteins in the sod1 mutant was greater than that in the wild-type and amount of glutathione was much decreased in the sod1 mutant compared with the wild-type. Genes induced by oxidative stress were induced by phloxine B under illumination with light and some were induced by phloxine B without light.[1]


  1. Pro-oxidant action of phloxine B on fission yeast Schizosaccharomyces pombe. Mutoh, N., Kawabata, M., Nakagawa, C.W., Kitajima, S. Yeast (2005) [Pubmed]
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