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-Structure paper
| タイトル | Structural basis of 5' splice site recognition by the minor spliceosome. |
|---|---|
| ジャーナル・号・ページ | Mol Cell, Vol. 85, Issue 3, Page 652-664.e4, Year 2025 |
| 掲載日 | 2025年2月6日 |
著者 | Jiangfeng Zhao / Daniel Peter / Irina Brandina / Xiangyang Liu / Wojciech P Galej / ![]() |
| PubMed 要旨 | The minor spliceosome catalyzes excision of U12-dependent introns from precursors of eukaryotic messenger RNAs (pre-mRNAs). This process is critical for many cellular functions, but the underlying ...The minor spliceosome catalyzes excision of U12-dependent introns from precursors of eukaryotic messenger RNAs (pre-mRNAs). This process is critical for many cellular functions, but the underlying molecular mechanisms remain elusive. Here, we report a cryoelectron microscopy (cryo-EM) reconstruction of the 13-subunit human U11 small nuclear ribonucleoprotein particle (snRNP) complex in apo and substrate-bound forms, revealing the architecture of the U11 small nuclear RNA (snRNA), five minor spliceosome-specific factors, and the mechanism of the U12-type 5' splice site (5'SS) recognition. SNRNP25 and SNRNP35 specifically recognize U11 snRNA, while PDCD7 bridges SNRNP25 and SNRNP48, located at the distal ends of the particle. SNRNP48 and ZMAT5 are positioned near the 5' end of U11 snRNA and stabilize binding of the incoming 5'SS. Recognition of the U12-type 5'SS is achieved through base-pairing to the 5' end of the U11 snRNA and unexpected, non-canonical base-triple interactions with the U11 snRNA stem-loop 3. Our structures provide mechanistic insights into U12-dependent intron recognition and the evolution of the splicing machinery. |
リンク | Mol Cell / PubMed:39809272 |
| 手法 | EM (単粒子) |
| 解像度 | 3.0 - 3.5 Å |
| 構造データ | EMDB-18984, PDB-8r7n: EMDB-51223, PDB-9gbw: EMDB-51225, PDB-9gbz: EMDB-51226, PDB-9gc0: EMDB-51233, PDB-9gcl: EMDB-51234, PDB-9gcm: |
| 由来 |
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キーワード | SPLICING / minor spliceosome / U11 snRNP / RNA-protein complex |
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