Translational control of the cytosolic stress response by mitochondrial ribosomal protein L18.

Translational control of the cytosolic stress response by mitochondrial ribosomal protein L18.
复制标题

DOI:
10.1038/nsmb.3010
复制
发表时间:
2015-05
影响因子:
16.8
通讯作者:
Qian, Shu-Bing
Qian, Shu-Bing
中科院分区:
生物学1区
文献类型:
--
作者:
Zhang, Xingqian;Gao, Xiangwei;Coots, Ryan Alex;Conn, Crystal S.;Liu, Botao;Qian, Shu-Bing

文献摘要

参考文献

被引文献

相似文献

作为对压力的反应,细胞减弱了全球蛋白质的合成,但允许编码热休克蛋白(HSPs)的mRNAs的有效翻译。尽管自第一次描述热休克反应以来已经有几十年了,但细胞如何实现对HSP合成的翻译控制仍然是个谜。在这里,我们报告了线粒体核糖体蛋白L18(MRPL18)在哺乳动物胞质应激反应中的一个意想不到的作用。MRPL18携带一个下游的CUG起始密码子,并以一种应力依赖的方式产生胞浆异构体。胞质MRPL18整合到80S核糖体中,促进核糖体与应激过程中选择翻译的mRNAs的结合。MRPL18基因敲除对线粒体功能的影响很小,但在翻译水平上显著抑制了胞质HSP的表达。我们的结果揭示了哺乳动物细胞中一种迄今尚未描述的应激适应机制,它涉及到在胞质应激反应中形成负责翻译调节的“杂交”核糖体。
In response to stress, cells attenuate global protein synthesis but permit efficient translation of mRNAs encoding heat shock proteins (HSPs). Despite decades since the first description of the heat shock response, how cells achieve translational control of HSP synthesis remains enigmatic. Here we report an unexpected role for mitochondrial ribosomal protein L18 (MRPL18) in the mammalian cytosolic stress response. MRPL18 bears a downstream CUG start codon and generates a cytosolic isoform in a stress-dependent manner. Cytosolic MRPL18 incorporates into the 80S ribosome and facilitates ribosome engagement on mRNAs selected for translation during stress. MRPL18 knockdown has minimal effects on mitochondria function, but substantially dampens cytosolic HSP expression at the level of translation. Our results uncover a hitherto uncharacterized stress adaptation mechanism in mammalian cells, which involves formation of a “hybrid” ribosome responsible for translational regulation during the cytosolic stress response.
DOI: 10.1016/j.tibs.2010.12.002
发表时间: 2011-03
影响因子: 13.8
作者:
Gilbert, Wendy V.
通讯作者: Gilbert, Wendy V.
DOI: 10.1074/jbc.m110.172882
发表时间: 2011-02-25
影响因子: 4.8
作者:
Sun, Jun;Conn, Crystal S.;Qian, Shu-Bing
通讯作者: Qian, Shu-Bing
DOI: 10.1073/pnas.1207846109
发表时间: 2012-09-11
影响因子: 11.1
作者:
Lee, Sooncheol;Liu, Botao;Qian, Shu-Bing
通讯作者: Qian, Shu-Bing
DOI: 10.1016/j.bbagrm.2011.11.009
发表时间: 2012-09
影响因子: 4.7
作者:
Christian, Brooke E.;Spremulli, Linda L.
通讯作者: Spremulli, Linda L.
DOI: 10.1073/pnas.1216454109
发表时间: 2013-01-02
影响因子: 11.1
作者:
Lee, Amy Si-Ying;Burdeinick-Kerr, Rebeca;Whelan, Sean P. J.
通讯作者: Whelan, Sean P. J.