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-Structure paper
タイトル | Structural basis of pre-tRNA intron removal by human tRNA splicing endonuclease. |
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ジャーナル・号・ページ | Mol Cell, Vol. 83, Issue 8, Page 1328-11339.e4, Year 2023 |
掲載日 | 2023年4月20日 |
著者 | Xiaofeng Zhang / Fenghua Yang / Xiechao Zhan / Tong Bian / Zhihan Xing / Yichen Lu / Yigong Shi / |
PubMed 要旨 | Removal of the intron from precursor-tRNA (pre-tRNA) is essential in all three kingdoms of life. In humans, this process is mediated by the tRNA splicing endonuclease (TSEN) comprising four subunits: ...Removal of the intron from precursor-tRNA (pre-tRNA) is essential in all three kingdoms of life. In humans, this process is mediated by the tRNA splicing endonuclease (TSEN) comprising four subunits: TSEN2, TSEN15, TSEN34, and TSEN54. Here, we report the cryo-EM structures of human TSEN bound to full-length pre-tRNA in the pre-catalytic and post-catalytic states at average resolutions of 2.94 and 2.88 Å, respectively. Human TSEN features an extended surface groove that holds the L-shaped pre-tRNA. The mature domain of pre-tRNA is recognized by conserved structural elements of TSEN34, TSEN54, and TSEN2. Such recognition orients the anticodon stem of pre-tRNA and places the 3'-splice site and 5'-splice site into the catalytic centers of TSEN34 and TSEN2, respectively. The bulk of the intron sequences makes no direct interaction with TSEN, explaining why pre-tRNAs of varying introns can be accommodated and cleaved. Our structures reveal the molecular ruler mechanism of pre-tRNA cleavage by TSEN. |
リンク | Mol Cell / PubMed:37028420 |
手法 | EM (単粒子) |
解像度 | 2.9 - 2.94 Å |
構造データ | EMDB-34904, PDB-8hmy: EMDB-34905, PDB-8hmz: |
化合物 | ChemComp-MG: |
由来 |
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キーワード | RNA BINDING PROTEIN/RNA / pre-tRNA splicing / TSEN / pre-tRNA / RNA BINDING PROTEIN-RNA complex |