Regulation of durum wheat Na+/H+ exchanger TdSOS1 by phosphorylation
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- 作者：Kaouthar Feki (1)
Francisco J. Quintero (2)
Jose M. Pardo (2)
Khaled Masmoudi (1) khaled.masmoudi@cbs.rnrt.tn - 关键词：Na+/H+ antiporter SOS1 – ; Auto ; inhibitory domain – ; Phosphorylation – ; SOS2 – ; Salt stress – ; Triticum durum
- 刊名：Plant Molecular Biology
- 出版年：2011
- 出版时间：August 2011
- 年：2011
- 卷：76
- 期：6
- 页码：545-556
- 全文大小：495.2 KB
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- 刊物类别：Biomedical and Life Sciences
- 刊物主题：Life Sciences
Plant Sciences
Biochemistry
Plant Pathology - 出版者：Springer Netherlands
- ISSN：1573-5028
文摘
We have identified a plasma membrane Na+/H+ exchanger from durum wheat, designated TdSOS1. Heterologous expression of TdSOS1 in a yeast strain lacking endogenous Na+ efflux proteins showed complementation of the Na+- and Li+-sensitive phenotype by a mechanism involving cation efflux. Salt tolerance conferred by TdSOS1 was maximal when co-expressed with the Arabidopsis protein kinase complex SOS2/SOS3. In vitro phosphorylation of TdSOS1 with a hyperactive form of the Arabidopsis SOS2 kinase (T/DSOS2∆308) showed the importance of two essential serine residues at the C-terminal hydrophilic tail (S1126, S1128). Mutation of these two serine residues to alanine decreased the phosphorylation of TdSOS1 by T/DSOS2∆308 and prevented the activation of TdSOS1. In addition, deletion of the C-terminal domain of TdSOS1 encompassing serine residues at position 1126 and 1128 generated a hyperactive form that had maximal sodium exclusion activity independent from the regulatory SOS2/SOS3 complex. These results are consistent with the presence of an auto-inhibitory domain at the C-terminus of TdSOS1 that mediates the activation of TdSOS1 by the protein kinase SOS2. Expression of TdSOS1 mRNA in young seedlings of the durum wheat variety Om Rabia3, using different abiotic stresses (ionic and oxidative stress) at different times of exposure, was monitored by RT–PCR.