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Ren, Xiao‐Ling; Qi, Guo‐Ning; Feng, Han‐Qian; Zhao, Shuai; Zhao, Shuang‐Shuang; Wang, Yi; Wu, Wei‐Hua
The Plant journal : for cell and molecular biology, April 2013, 2013-Apr, 20130401, Letnik: 74, Številka: 2Journal Article
Summary Potassium transporters and channels play crucial roles in K+ uptake and translocation in plant cells. These roles are essential for plant growth and development. AKT1 is an important K+ channel in Arabidopsis roots that is involved in K+ uptake. It is known that AKT1 is activated by a protein kinase CIPK23 interacting with two calcineurin B‐like proteins CBL1/CBL9. The present study showed that another calcineurin B‐like protein (CBL10) may also regulate AKT1 activity. The CBL10‐over‐expressing lines showed a phenotype as sensitive as that of the akt1 mutant under low‐K+ conditions. In addition, the K+ content of both CBL10‐over‐expressing lines and akt1 mutant plants were significantly reduced compared with wild‐type plants. Moreover, CBL10 directly interacted with AKT1, as verified in yeast two‐hybrid, BiFC and co‐immunoprecipitation experiments. The results of electrophysiological analysis in both Xenopus oocytes and Arabidopsis root cell protoplasts demonstrated that CBL10 impairs AKT1‐mediated inward K+ currents. Furthermore, the results from the yeast two‐hybrid competition assay indicated that CBL10 may compete with CIPK23 for binding to AKT1 and negatively modulate AKT1 activity. The present study revealed a CBL‐interacting protein kinase‐independent regulatory mechanism of calcineurin B‐like proteins in which CBL10 directly regulates AKT1 activity and affects ion homeostasis in plant cells.
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JCR | SNIP | JCR | SNIP | JCR | SNIP | JCR | SNIP |
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in: SICRIS
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