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  • 标题:Transient tether between the SRP RNA and SRP receptor ensures efficient cargo delivery during cotranslational protein targeting
  • 本地全文:下载
  • 作者:Kuang Shen ; Shu-ou Shan
  • 期刊名称:Proceedings of the National Academy of Sciences
  • 印刷版ISSN:0027-8424
  • 电子版ISSN:1091-6490
  • 出版年度:2010
  • 卷号:107
  • 期号:17
  • 页码:7698-7703
  • DOI:10.1073/pnas.1002968107
  • 语种:English
  • 出版社:The National Academy of Sciences of the United States of America
  • 摘要:Kinetic control of macromolecular interactions plays key roles in biological regulation. An example of such control occurs in cotranslational protein targeting by the signal recognition particle (SRP), during which the SRP RNA and the cargo both accelerate complex assembly between the SRP and SRP receptor FtsY 102-fold. The molecular mechanism underlying these rate accelerations was unclear. Here we show that a highly conserved basic residue, Lys399, on the lateral surface of FtsY provides a novel RNA tetraloop receptor to mediate the SRP RNA- and cargo-induced acceleration of SRP-FtsY complex assembly. We propose that the SRP RNA, by using its tetraloop to interact with FtsY-Lys399, provides a transient tether to stabilize the early stage and transition state of complex formation; this accelerates the assembly of a stable SRP-FtsY complex and allows the loading of cargo to be efficiently coupled to its membrane delivery. The use of a transient tether to increase the lifetime of collisional intermediates and reduce the dimension of diffusional search represents a novel and effective mechanism to accelerate macromolecular interactions.
  • 关键词:catalytic RNA ; macromolecular interaction ; signal recognition particle ; GTPases ; fluroescence
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