ジャーナル: Nat Commun / 年: 2024 タイトル: RAPP-containing arrest peptides induce translational stalling by short circuiting the ribosomal peptidyltransferase activity. 著者: Martino Morici / Sara Gabrielli / Keigo Fujiwara / Helge Paternoga / Bertrand Beckert / Lars V Bock / Shinobu Chiba / Daniel N Wilson / 要旨: Arrest peptides containing RAPP (ArgAlaProPro) motifs have been discovered in both Gram-positive and Gram-negative bacteria, where they are thought to regulate expression of important protein ...Arrest peptides containing RAPP (ArgAlaProPro) motifs have been discovered in both Gram-positive and Gram-negative bacteria, where they are thought to regulate expression of important protein localization machinery components. Here we determine cryo-EM structures of ribosomes stalled on RAPP arrest motifs in both Bacillus subtilis and Escherichia coli. Together with molecular dynamics simulations, our structures reveal that the RAPP motifs allow full accommodation of the A-site tRNA, but prevent the subsequent peptide bond from forming. Our data support a model where the RAP in the P-site interacts and stabilizes a single hydrogen atom on the Pro-tRNA in the A-site, thereby preventing an optimal geometry for the nucleophilic attack required for peptide bond formation to occur. This mechanism to short circuit the ribosomal peptidyltransferase activity is likely to operate for the majority of other RAPP-like arrest peptides found across diverse bacterial phylogenies.
モデルのタイプ: INSILICO MODEL In silico モデル: An unpublished map from our group was initially low-pass filtered and used as model, since the biology was analogous
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解像度のタイプ: BY AUTHOR / 解像度: 2.3 Å / 解像度の算出法: FSC 0.143 CUT-OFF / 使用した粒子像数: 152257