A putative rice L-cysteine desulfhydrase encodes a true L-cysteine synthase that regulates plant cadmium tolerance

文献类型： 外文期刊

第一作者： Shen, Jie

作者： Shen, Jie;Su, Ye;Zhou, Can;Zhang, Feng;Zhou, Heng;Xie, Yanjie;Shen, Jie;Su, Ye;Yuan, Xingxing;Liu, Xin;Wu, Deliang;Yin, Xianchao

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关键词： L-cysteine desulfhydrase; Cysteine synthase; Hydrogen sulfide; Cadmium; Glutathione

期刊名称：PLANT GROWTH REGULATION （ 影响因子：3.412； 五年影响因子：3.691 ）

ISSN： 0167-6903

年卷期： 2019 年 89 卷 2 期

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收录情况： SCI

摘要： Recent years have witnessed tremendous progress in understanding the biological relevance of hydrogen sulfide (H2S) as the third gasotransmitter for multiple signaling events in plants. L-Cys desulfhydrase (LCD) catalyzes the formation of H2S by using L-Cys as a substrate. In previous studies, we detected LCD activity in rice, but the corresponding genetic information and its biological function in the alleviation of plant Cd toxicity are still unknown. In this study, a putative LCD gene (OsLCD2) with high homology to Arabidopsis LCD has been cloned in rice. Surprisingly, the biochemical characterization of the recombinant OsLCD2 protein suggests that this protein predominantly possesses cysteine synthesis activity rather than the degradation of cysteine to produce H2S, and thus, the gene has been renamed OsCS1. OsCS1 localizes inside the nucleus in rice protoplasts. Molecular evidence shows that OsCS1 mRNA is ubiquitously expressed in rice, and up-regulated by cadmium. It has been further observed that over-expression of OsCS1 in Arabidopsis results in the enhanced glutathione biosynthesis, which allows plants to tolerate cadmium stress. Overall, the above findings provide evidence that OsCS1 is a potentially important enzyme responsible for the synthesis of cysteine, which could provide a new information about the metabolism of H2S in plants.

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