+検索条件
-Structure paper
タイトル | Doublet decoding of tRNA demonstrates plasticity of ribosomal decoding center. |
---|---|
ジャーナル・号・ページ | Nat Commun, Vol. 16, Issue 1, Page 5402, Year 2025 |
掲載日 | 2025年6月26日 |
![]() | Shruthi Krishnaswamy / Shirin Akbar / Daniel S D Larsson / Yang Chen / Maria Selmer / ![]() ![]() |
PubMed 要旨 | Frameshifts can be caused by specific combinations of tRNA and mRNA. The wildtype AGC-decoding E. coli tRNA has been shown to induce -1 ribosomal frameshifting on GCA alanine codons, and proposed to ...Frameshifts can be caused by specific combinations of tRNA and mRNA. The wildtype AGC-decoding E. coli tRNA has been shown to induce -1 ribosomal frameshifting on GCA alanine codons, and proposed to read a two-base codon instead of a canonical triplet. However, it has remained unclear whether this type of non-cognate decoding can be accommodated by the ribosome. Here, we perform single-particle cryo-EM reconstructions on E. coli 70S ribosomes with the frameshift-inducing tRNA bound to the non-cognate GCA codon or the cognate AGC codon in the ribosomal A site. The structures demonstrate that doublet decoding is made possible when A1493, the conserved monitoring base in 16S rRNA, mimics a first codon base, forming a Hoogsteen base pair with U36 from the anticodon and stacking with the mRNA. This interaction pushes the first two bases of the A-site codon in position for base pairing with C35 and G34 of the anticodon. |
![]() | ![]() ![]() ![]() |
手法 | EM (単粒子) |
解像度 | 2.49 - 2.61 Å |
構造データ | EMDB-51679, PDB-9gxx: EMDB-51758, PDB-9h0l: |
化合物 | ![]() ChemComp-MG: ![]() ChemComp-SPD: ![]() ChemComp-PUT: ![]() ChemComp-SPM: ![]() ChemComp-ZN: |
由来 |
|
![]() | RIBOSOME / decoding / frame shift / translation |