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-Structure paper
| タイトル | A conserved PIWI silencing complex detects piRNA-target engagement. |
|---|---|
| ジャーナル・号・ページ | Mol Cell, Vol. 85, Issue 17, Page 3275-33287.e7, Year 2025 |
| 掲載日 | 2025年9月4日 |
著者 | Dipayan De / Sucharita Sarkar / Luca F R Gebert / Timothy Wiryaman / Todd A Anzelon / Ian J MacRae / ![]() |
| PubMed 要旨 | In animal germ cells, PIWI proteins use piRNAs to detect active selfish genetic elements. Base-pairing to a piRNA defines transposon recognition, but how this interaction triggers a defensive ...In animal germ cells, PIWI proteins use piRNAs to detect active selfish genetic elements. Base-pairing to a piRNA defines transposon recognition, but how this interaction triggers a defensive response remains unclear. Here, we identify a transposon recognition complex composed of the silkworm proteins Siwi, GTSF1, and Maelstrom. Biochemical and cryo-electron microscopy (cryo-EM) analyses show that extended piRNA-target pairing locks Siwi in a conformation that recruits GTSF1 and Maelstrom. Extended piRNA-target pairing is recognized by the N-terminal helix of Maelstrom and the first zinc finger of GTSF1, which act together to hold Siwi in an endonucleolytically active state. The resulting activated complex, termed Siwi, rapidly cleaves target RNAs and recruits the piRNA biogenesis factor Spindle-E. Structural predictions reveal related complexes in animals ranging from humans to sponges, indicating PIWI assembly is a conserved transposon recognition mechanism employed broadly across the metazoan kingdom. |
リンク | Mol Cell / PubMed:40912244 / PubMed Central |
| 手法 | EM (単粒子) |
| 解像度 | 3.6 - 4.2 Å |
| 構造データ | EMDB-49407, PDB-9nhb: EMDB-49408, PDB-9nhc: EMDB-49409, PDB-9nhd: EMDB-49410, PDB-9nhe: EMDB-49422, PDB-9nhs: |
| 化合物 | ![]() ChemComp-MG: ![]() ChemComp-ZN: |
| 由来 |
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キーワード | RNA BINDING PROTEIN/RNA / SIWI / GTSF1 / RNA BINDING PROTEIN / RNA BINDING PROTEIN-RNA complex / Maelstrom / Spindle-E |
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