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-Structure paper
タイトル | A tRNA modification with aminovaleramide facilitates AUA decoding in protein synthesis. |
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ジャーナル・号・ページ | Nat Chem Biol, Vol. 21, Issue 4, Page 522-531, Year 2025 |
掲載日 | 2024年9月19日 |
![]() | Kenjyo Miyauchi / Satoshi Kimura / Naho Akiyama / Kazuki Inoue / Kensuke Ishiguro / Thien-Son Vu / Veerasak Srisuknimit / Kenta Koyama / Gosuke Hayashi / Akiko Soma / Asuteka Nagao / Mikako Shirouzu / Akimitsu Okamoto / Matthew K Waldor / Tsutomu Suzuki / ![]() ![]() ![]() |
PubMed 要旨 | Modified tRNA anticodons are critical for proper mRNA translation during protein synthesis. It is generally thought that almost all bacterial tRNAs use a modified cytidine-lysidine (L)-at the first ...Modified tRNA anticodons are critical for proper mRNA translation during protein synthesis. It is generally thought that almost all bacterial tRNAs use a modified cytidine-lysidine (L)-at the first position (34) of the anticodon to decipher the AUA codon as isoleucine (Ile). Here we report that tRNAs from plant organelles and a subset of bacteria contain a new cytidine derivative, designated 2-aminovaleramididine (avaC). Like L34, avaC34 governs both Ile-charging ability and AUA decoding. Cryo-electron microscopy structural analyses revealed molecular details of codon recognition by avaC34 with a specific interaction between its terminal amide group and an mRNA residue 3'-adjacent to the AUA codon. These findings reveal the evolutionary variation of an essential tRNA modification and demonstrate the molecular basis of AUA decoding mediated by a unique tRNA modification. |
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手法 | EM (単粒子) |
解像度 | 2.25 - 2.47 Å |
構造データ | EMDB-39577, PDB-8yuo: EMDB-39578, PDB-8yup: EMDB-39579, PDB-8yuq: EMDB-39580, PDB-8yur: EMDB-39581, PDB-8yus: |
化合物 | ![]() ChemComp-MG: |
由来 |
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![]() | RIBOSOME / tRNA modification / decoding |