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-Structure paper
| タイトル | The PAZ pocket and dimerization drive CpAgo's guide-independent and DNA-guided dual catalysis. |
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| ジャーナル・号・ページ | Nat Commun, Vol. 16, Issue 1, Page 6599, Year 2025 |
| 掲載日 | 2025年7月17日 |
著者 | Yuchan Liu / Jiasu Zhang / Ji Liu / Shengchun Zhang / Linfeng An / Wenbing Xie / Kaiming Zhang / Shanshan Li / ![]() |
| PubMed 要旨 | Argonaute proteins (Agos) play essential roles in nucleic acid targeting across life domains. While eukaryotic Agos (eAgos) utilize small-interfering RNAs (siRNAs) or microRNAs (miRNAs) for RNA ...Argonaute proteins (Agos) play essential roles in nucleic acid targeting across life domains. While eukaryotic Agos (eAgos) utilize small-interfering RNAs (siRNAs) or microRNAs (miRNAs) for RNA interference, the mechanisms driving prokaryotic Agos (pAgos) in bacterial defense remain underexplored. Here, we characterize the mesophilic pAgo from Clostridium perfringens (CpAgo), which exhibits robust guide-independent and DNA-guided activity at 37 °C. CpAgo efficiently degrades plasmids and structured RNAs into small fragments, generating DNA fragments that serve as guides for subsequent cleavage. Cryo-electron microscopy reveals a positively-charged PAZ nucleotide-binding pocket, critical for both guide-dependent and guide-independent substrate recognition and cleavage. Structural analysis identifies CpAgo's dimerization as a prerequisite for catalytic activity, supporting both nucleic acid degradation and targeted action. Functional assays in Escherichia coli demonstrate CpAgo's role in bacterial defense by mediating plasmid degradation and DNA-guided cleavage. These findings position CpAgo as a critical component of prokaryotic immunity and a promising tool for biotechnology. |
リンク | Nat Commun / PubMed:40675991 / PubMed Central |
| 手法 | EM (単粒子) |
| 解像度 | 2.86 - 3.81 Å |
| 構造データ | EMDB-61474, PDB-9jh7: EMDB-61475, PDB-9jh8: EMDB-61476, PDB-9jh9: EMDB-61485, PDB-9jhk: EMDB-61486, PDB-9jhl: EMDB-61487, PDB-9jhm: EMDB-61488, PDB-9jhn: |
| 化合物 | ![]() ChemComp-MN: |
| 由来 |
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キーワード | DNA BINDING PROTEIN/DNA / pAgos / nucleotide-binding pocket / PAZ / cryo-EM / DNA BINDING PROTEIN / DNA BINDING PROTEIN-DNA complex / dimerization |
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