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-Structure paper
| タイトル | Structure of the signal recognition particle interacting with the elongation-arrested ribosome. |
|---|---|
| ジャーナル・号・ページ | Nature, Vol. 427, Issue 6977, Page 808-814, Year 2004 |
| 掲載日 | 2004年2月26日 |
著者 | Mario Halic / Thomas Becker / Martin R Pool / Christian M T Spahn / Robert A Grassucci / Joachim Frank / Roland Beckmann / ![]() |
| PubMed 要旨 | Cotranslational translocation of proteins across or into membranes is a vital process in all kingdoms of life. It requires that the translating ribosome be targeted to the membrane by the signal ...Cotranslational translocation of proteins across or into membranes is a vital process in all kingdoms of life. It requires that the translating ribosome be targeted to the membrane by the signal recognition particle (SRP), an evolutionarily conserved ribonucleoprotein particle. SRP recognizes signal sequences of nascent protein chains emerging from the ribosome. Subsequent binding of SRP leads to a pause in peptide elongation and to the ribosome docking to the membrane-bound SRP receptor. Here we present the structure of a targeting complex consisting of mammalian SRP bound to an active 80S ribosome carrying a signal sequence. This structure, solved to 12 A by cryo-electron microscopy, enables us to generate a molecular model of SRP in its functional conformation. The model shows how the S domain of SRP contacts the large ribosomal subunit at the nascent chain exit site to bind the signal sequence, and that the Alu domain reaches into the elongation-factor-binding site of the ribosome, explaining its elongation arrest activity. |
リンク | Nature / PubMed:14985753 |
| 手法 | EM (単粒子) |
| 解像度 | 12.0 Å |
| 構造データ | |
| 由来 |
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キーワード | TRANSLATION / signal recognition particle / RNA binding |
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