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-Structure paper
| タイトル | Structure of the MIWI endoribonuclease bound to pachytene piRNAs from mouse testes. |
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| ジャーナル・号・ページ | Cell Rep, Vol. 45, Issue 1, Page 116804, Year 2026 |
| 掲載日 | 2026年1月12日 |
著者 | Nicole Raad / Carmen Fernandez-Rodriguez / Radha Raman Pandey / Inayathulla Mohammed / Emiko Uchikawa / Fabienne Burger / David Homolka / Ramesh S Pillai / ![]() |
| PubMed 要旨 | PIWI-interacting RNAs (piRNAs) guide PIWI endoribonucleases to destroy transposon transcripts, ensuring animal fertility. Here, we report the cryo-electron microscopy structure of the MIWI-pachytene ...PIWI-interacting RNAs (piRNAs) guide PIWI endoribonucleases to destroy transposon transcripts, ensuring animal fertility. Here, we report the cryo-electron microscopy structure of the MIWI-pachytene piRNA complex isolated from mouse testes. The piRNA is held via non-specific charge-based interactions with the RNA backbone and by specific recognition of the first nucleotide uridine by residues within the MID and PIWI domains. The first six nucleotides of the guide RNA take up the A-form conformation to facilitate pairing with the target. The RNA channel is wider than that observed in insect PIWI proteins, explaining the tolerance for piRNA seed:target mismatches. The PIWI endonuclease domain is in an inactive "un-plugged" state, with the loop containing a catalytic residue (E671) requiring structural re-orientation for activity. Furthermore, the PIWI domain reveals a conserved pre-formed pocket that may serve to accommodate a conserved tryptophan from the interacting factor GTSF1 to promote small RNA-guided endoribonuclease activity. |
リンク | Cell Rep / PubMed:41528842 |
| 手法 | EM (単粒子) |
| 解像度 | 2.89 - 4.2 Å |
| 構造データ | EMDB-54428, PDB-9s0z: EMDB-54446, PDB-9s1e: EMDB-54907, PDB-9shp: EMDB-54908, PDB-9shq: |
| 化合物 | ![]() ChemComp-MG: |
| 由来 |
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キーワード | RNA BINDING PROTEIN / MIWI / PIWIL1 / piRNA / slicer / pachytene piRNA |
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