The crystal structure of the signal recognition particle in complex with its receptor.

The crystal structure of the signal recognition particle in complex with its receptor.
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DOI:
10.1126/science.1196473
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发表时间:
2011-02-18
期刊:
Science (New York, N.Y.)
影响因子:
--
通讯作者:
Ban N
Ban N
中科院分区:
其他
文献类型:
--
作者:
Ataide SF;Schmitz N;Shen K;Ke A;Shan SO;Doudna JA;Ban N

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膜和分泌蛋白的共翻译靶向由普遍保守的信号识别颗粒(SRP)介导。SRP与其受体(SR)一起介导携带信号序列的翻译核糖体向靶膜上的translocons的GTP依赖性递送。在这里,我们提出的晶体结构的SRP:SR复合物在3.9 μ m分辨率和生化数据显示,激活的SRP:SR GTP酶复合物结合的SRP发夹RNA的远端,GTP水解刺激。结合以前的研究结果,这些结果表明,SRP:SR GTdR复合物最初组装在SRP RNA的四环末端,然后重新定位到RNA的另一端。这种重排提供了一种将GTP水解与货物向易位子的移交偶联的机制。
Co-translational targeting of membrane and secretory proteins is mediated by the universally conserved Signal Recognition Particle (SRP). Together with its receptor (SR), SRP mediates the GTP-dependent delivery of translating ribosomes bearing signal sequences to translocons on the target membrane. Here we present the crystal structure of the SRP:SR complex at 3.9 Å resolution and biochemical data revealing that the activated SRP:SR GTPase complex bind the distal end of the SRP hairpin RNA where GTP hydrolysis is stimulated. Combined with previous findings, these results suggest that the SRP:SR GTPase complex initially assembles at the tetraloop end of the SRP RNA and then relocalizes to the opposite end of the RNA. This rearrangement provides a mechanism for coupling GTP hydrolysis to the handover of cargo to the translocon.
DOI: 10.1126/science.1165971
发表时间: 2009-01-02
期刊: Science (New York, N.Y.)
影响因子: --
作者:
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