Abstract
Peroxiredoxins (Prxs), a group of antioxidant enzymes, are an important component of the oxidative defense system and have been demonstrated to function as peroxidases, sensors of H2O2-mediated signaling and/or chaperones. In this study, a cDNA library was constructed from a halotolerant alga, Dunaliella viridis, and was used in a functional complementation screen for antioxidative genes in an oxidative sensitive yeast mutant. Two Prx genes, DvPrx1 and DvPrx2, were obtained from this screen. These two genes were classified as type II Prx and 2-Cys Prx based on amino acid sequence and phylogenetic analysis. When over-expressed in yeast cells, both Prx genes were able to confer better oxidative tolerance and decrease the level of reactive oxygen species (ROS). Subcellular localization experiments in tobacco cells revealed that both DvPrx1 and DvPrx2 were localized in the cytosol. The transcription of DvPrx1 and DvPrx2 can be induced by hypersalinity shock, but is not obviously affected by treatment with high levels of oxidant. Our results shed light on the function and regulation of Prx genes from Dunaliella and their potential roles in salt tolerance.
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Acknowledgments
We are grateful to Dr. Anu Saloheimo for providing the pAJ401 plasmid, Dr. Michel B. Toledano for the ∆yap1 and Y252 strains, Dr. Yan Zhang for the pB7FWG2 plasmid, Dr. Xiaoyong Deng for confocal microscopy support and Yihan Chen for technical assistance. This work was supported by the National Natural Sciences Foundation of China (30871278, 30970242), the Ministry of Agriculture of China (2008ZX08003-001, 2008ZX08003-005), Shanghai Municipal Science and Technology Commission (09DZ2271800).
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Communicated by P. Kumar.
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299_2011_1060_MOESM1_ESM.tif
Online Recourse 1 The full-length cDNA sequence and the deduced amino acid sequence of DvPrx1 (A) and DvPrx2 (B).The start codon (ATG) and the stop codon (TAA) are showed in bold; mark * also represents TAA in the translated line; the in-frame stop codon upstream DvPrx1 is shaded in grey (TIFF 908 kb)
299_2011_1060_MOESM2_ESM.tif
Online Recourse 2 The phylogenetic tree of peroxiredoxins from different species.CLUSTAL X was used to generate the tree for general classification of DvPrx1 and DvPrx2 (A) or detailed comparison of DvPrx2 (B) with their orthologs. See Online Recourse 3 for species abbreviations and protein accession numbers (TIFF 385 kb)
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Yuan, H., Meng, X., Gao, Q. et al. The characterization of two peroxiredoxin genes in Dunaliella viridis provides insights into antioxidative response to salt stress. Plant Cell Rep 30, 1503–1512 (2011). https://doi.org/10.1007/s00299-011-1060-8
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DOI: https://doi.org/10.1007/s00299-011-1060-8