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-Structure paper
| タイトル | The force-sensing peptide VemP employs extreme compaction and secondary structure formation to induce ribosomal stalling. |
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| ジャーナル・号・ページ | Elife, Vol. 6, Year 2017 |
| 掲載日 | 2017年5月30日 |
著者 | Ting Su / Jingdong Cheng / Daniel Sohmen / Rickard Hedman / Otto Berninghausen / Gunnar von Heijne / Daniel N Wilson / Roland Beckmann / ![]() |
| PubMed 要旨 | Interaction between the nascent polypeptide chain and the ribosomal exit tunnel can modulate the rate of translation and induce translational arrest to regulate expression of downstream genes. The ...Interaction between the nascent polypeptide chain and the ribosomal exit tunnel can modulate the rate of translation and induce translational arrest to regulate expression of downstream genes. The ribosomal tunnel also provides a protected environment for initial protein folding events. Here, we present a 2.9 Å cryo-electron microscopy structure of a ribosome stalled during translation of the extremely compacted VemP nascent chain. The nascent chain forms two α-helices connected by an α-turn and a loop, enabling a total of 37 amino acids to be observed within the first 50-55 Å of the exit tunnel. The structure reveals how α-helix formation directly within the peptidyltransferase center of the ribosome interferes with aminoacyl-tRNA accommodation, suggesting that during canonical translation, a major role of the exit tunnel is to prevent excessive secondary structure formation that can interfere with the peptidyltransferase activity of the ribosome. |
リンク | Elife / PubMed:28556777 / PubMed Central |
| 手法 | EM (単粒子) |
| 解像度 | 2.9 Å |
| 構造データ | |
| 由来 |
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キーワード | RIBOSOME / VemP-SRC / peptidyltransferase center / ribosomal exit tunnel / helix-loop-helix. ribosome / 70S / ribosome stalling / arrest peptide |
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vibrio alginolyticus (バクテリア)
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