Quantitation of glutathione S-transferases in rice (Oryza sativa L.) roots exposed to cadmium by liquid chromatography- tandem mass spectrometry using isotope-labeled wing peptides as an internal standard

文献类型： 外文期刊

第一作者： Cao, Zhenzhen

作者： Cao, Zhenzhen;Mou, Renxiang;Cao, Zhaoyun;Lin, Xiaoyan;Ma, Youning;Zhu, Zhiwei;Chen, Mingxue

作者机构：

关键词： Glutathione S-transferases;Cadmium;Liquid chromatography-tandem mass spectrometry;Signature peptide;Isotope-labeled internal standard

期刊名称：PLANT METHODS （ 影响因子：4.993； 五年影响因子：5.312 ）

ISSN： 1746-4811

年卷期： 2017 年 13 卷

页码：

收录情况： SCI

摘要： Background: Plant glutathione S- transferases (GSTs, EC 2.5.1.18) are multifunctional enzymes involved in heavy metal cellular detoxification by conjugating the tripeptide (g-Glu-Cys-Gly) glutathione to heavy metals. Previous studies demonstrated that individual rice GSTs were differentially induced by heavy metal exposure at the mRNA transcript level. However, little information is available concerning changes in protein concentration of rice GSTs under heavy metal stress. Because the correlation between changes in protein concentration and gene expression under abiotic stress is poor, direct determination of rice GSTs protein concentrations during cadmium (Cd) exposure is a more effective and reliable approach to explore possible mechanisms of rice Cd translocation and accumulation. Results: This study established an optimized and advanced liquid chromatography-tandem mass spectrometry (LCMS/ MS)-based targeted proteomics assay for quantification of OsGSTF14 and OsGSTU6 proteins in Cd-stressed rice roots. The tryptic signature peptides were chosen as surrogate analytes and winged peptides containing the isotopelabeled signature peptides were used as the internal standards. The signature peptides exhibited good linearity in the range of 0.6-60 and 0.3-30 nM, respectively. The limit of detection and limit of quantification were 4.5 and 14.5 mu g/g for OsGSTF14, respectively, and 2.1 and 7.0 mu g/g for OsGSTU6. The spiking recoveries rates at low, medium and high levels were in the range of 72.5-93.4%, with intra- and inter-day precisions of 5.5-9.1 and 4.2-10.2%, respectively. Conclusions: The assay successfully quantified the temporal and dose responses of OsGSTF14 and OsGSTU6 proteins in Cd-stressed rice roots, with good accuracy, precision and high-throughput. This assay will have significant application in developing quantification methods of other proteins in Cd-stressed rice, which may provide more insight into the mechanisms of Cd translocation and accumulation in rice.

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