首页> 外文期刊>Nature >Calcium activation of Ras mediated by neuronal exchange factor Ras-GRF.
【24h】

Calcium activation of Ras mediated by neuronal exchange factor Ras-GRF.

机译:神经元交换因子Ras-GRF介导的Ras钙激活。

获取原文
获取原文并翻译 | 示例
           

摘要

Tyrosine kinase receptors stimulate the Ras signalling pathway by enhancing the activity of the SOS nucleotide-exchange factor. This occurs, at least in part, by the recruitment of an SOS-GRB2 complex to Ras in the plasma membrane. Here we describe a different signalling pathway to Ras that involves activation of the Ras-GRF exchange factor in response to Ca2+ influx. In particular, we show that the ability of Ras-GRF to activate Ras in vivo is markedly enhanced by raised Ca2+ concentrations. Activation is mediated by calmodulin binding to an IQ motif in Ras-GRF, because substitutions in conserved amino acids in this motif prevent both calmodulin binding to Ras-GRF and Ras-GRF activation in vivo. So far, full-length Ras-GRF has been detected only in brain neurons. Our findings implicate Ras-GRF in the regulation of neuronal functions that are influenced by Ca2+ signals.
机译:酪氨酸激酶受体通过增强SOS核苷酸交换因子的活性来刺激Ras信号通路。这至少部分地通过将SOS-GRB2复合物募集到质膜中的Ras而发生。在这里,我们描述了一个不同的信号转导到Ras,涉及响应Ca2 +涌入激活Ras-GRF交换因子。特别地,我们表明,升高的Ca2 +浓度显着增强了Ras-GRF在体内激活Ras的能力。激活是通过钙调蛋白与Ras-GRF中的IQ基序结合而介导的,因为该基序中保守氨基酸的取代会阻止钙调蛋白与Ras-GRF的结合以及体内Ras-GRF的激活。到目前为止,仅在脑神经元中检测到全长Ras-GRF。我们的发现暗示Ras-GRF参与了受Ca2 +信号影响的神经元功能的调节。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱:kefu@zhangqiaokeyan.com

京公网安备:11010802029741号 ICP备案号:京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有
  • 客服微信

  • 服务号