Plant glutathione peroxidases

被引:208
作者
Eshdat, Y [1 ]
Holland, D [1 ]
Faltin, Z [1 ]
BenHayyim, G [1 ]
机构
[1] AGR RES ORG,VOLCANI CTR,DEPT FRUIT TREE BREEDING & MOL GENET,IL-50250 BET DAGAN,ISRAEL
关键词
Citrus sinensis; oxidative stress; phospholipid hydroperoxide; plant glutathione peroxidases; selenocysteine;
D O I
10.1034/j.1399-3054.1997.1000204.x
中图分类号
Q94 [植物学];
学科分类号
071001 ;
摘要
Oxidative stress in plants causes the induction of several enzymes, including superoxide dismutase (EC 1.15.1.1), ascorbate peroxidase (EC 1.11.1.11)and glutathione reductase (EC 1.6.4.2),. The first two are responsible for converting superoxide to H2O2 and its subsequent reduction to H2O, and the third is involved in recycling of ascorbate. Glutathione peroxidases (GPWs EC 1.11.1.9) are a family of key enzymes involved in scavenging oxyradicals in animals. Only recently. indications for the existence of this enzyme in plants were reported. Genes with significant sequence homology to one member of the animal GPX family, namely phospholipid hydroperoxide glutathione peroxidase (PHGPX). were isolated from several plants. Cit-SAP, the protein product encoded by the citrus csa gene, which is induced by salt-stress, is so far the only plant PHGPX that has been isolated and characterized. This protein differs from the animal PHGPX in its rate of enzymatic activity and in containing a Cys instead of selenocysteine (Sec) as its presumed catalytic residue, The physiological role of Cit-SAP and Its homologs in other plants is not yet known.
引用
收藏
页码:234 / 240
页数:7
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