The channel-kinase TRPM7 regulates phosphorylation of the translational factor eEF2 via eEF2-k.

The channel-kinase TRPM7 regulates phosphorylation of the translational factor eEF2 via eEF2-k.
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DOI:
10.1016/j.cellsig.2010.11.011
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发表时间:
2011-03
影响因子:
4.8
通讯作者:
Schmitz C
Schmitz C
中科院分区:
生物学2区
文献类型:
--
作者:
Perraud AL;Zhao X;Ryazanov AG;Schmitz C

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蛋白质翻译是一个必要但能量昂贵的过程,它是根据细胞营养和能量状态精心调节的。真核延伸因子2 (eEF2)是一个中心调控点,因为它介导核糖体易位,并且可以被Thr56位点的磷酸化抑制。TRPM7是离子通道与功能性丝氨酸/丝氨酸激酶的独特融合。虽然TRPM7的通道功能涉及调节脊椎动物细胞生长所需的Mg2+摄取,但其激酶结构域的功能尚不清楚。在这里,我们发现在细胞生长受到Mg2+可用性限制的条件下,TRPM7通过其激酶介导eEF2的thr56磷酸化。trpm7激酶似乎并不直接使eEF2磷酸化,而是影响eEF2的同源激酶eEF2-k的数量,涉及其Ser77位点的磷酸化。这些发现表明,TRPM7的结构对偶性确保了其激酶在通道介导的Mg2+摄取附近的理想定位,从而允许调整蛋白质翻译速率以调节Mg2+的可用性。
Protein translation is an essential but energetically expensive process, which is carefully regulated in accordance to the cellular nutritional and energy status. Eukaryotic elongation factor 2 (eEF2) is a central regulation point since it mediates ribosomal translocation, and can be inhibited by phosphorylation at Thr56. TRPM7 is the unique fusion of an ion channel with a functional Ser/Thr-kinase. While TRPM7’s channel function has been implicated in regulating vertebrate Mg2+-uptake required for cell growth, the function of its kinase domain remains unclear. Here, we show that under conditions where cell growth is limited by Mg2+-availability, TRPM7 via its kinase mediates enhanced Thr56-phosphorylation of eEF2. TRPM7-kinase does not appear to directly phosphorylate eEF2, but rather to influence the amount of eEF2’s cognate kinase eEF2-k, involving its phosphorylation at Ser77. These findings suggest that TRPM7’s structural duality ensures ideal positioning of its kinase in close proximity to channel-mediated Mg2+ uptake, allowing for the adjustment of protein translational rates to the availability of Mg2+.
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