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-Structure paper
| タイトル | Catalytic activation of human Argonaute 2 requires RNA duplex deformation. |
|---|---|
| ジャーナル・号・ページ | Nat Struct Mol Biol, Year 2026 |
| 掲載日 | 2026年6月24日 |
著者 | Sucharita Sarkar / Luca F R Gebert / Ian J MacRae / ![]() |
| PubMed 要旨 | Small interfering RNAs (siRNAs) are an expanding class of RNA therapeutics, with seven drugs approved by the US Food and Drug Administration and many more in development. Rational design, however, ...Small interfering RNAs (siRNAs) are an expanding class of RNA therapeutics, with seven drugs approved by the US Food and Drug Administration and many more in development. Rational design, however, has been limited by incomplete understanding of how human Argonaute 2 (hAgo2) catalyzes target cleavage. Here we report high-resolution cryo-electron microscopy structures of hAgo2 bound to a target RNA in catalytic and noncatalytic conformations. The structures reveal that guide-target pairing alone is insufficient for slicing and catalysis requires deformation of the duplex through a coordinated network of RNA-protein interactions. Expansion of the central major groove positions the scissile phosphate, while compression toward the supplementary region docks the duplex into the hAgo2 cleft. A kink after guide nucleotide g6 disrupts seed-only pairing conformation and promotes the extended pairing required for catalysis. This rearrangement enables repositioning of K709 within the active site, while a pyrimidine at target position t10 optimally aligns R710 to accelerate cleavage. These findings provide a structural framework linking siRNA duplex geometry to catalytic efficiency and inform rational design of siRNAs with improved potency and specificity. |
リンク | Nat Struct Mol Biol / PubMed:42342972 |
| 手法 | EM (単粒子) |
| 解像度 | 3.0 - 3.3 Å |
| 構造データ | EMDB-46888: human Argonaute-2 R315V/H316A - miR-122 in complex with a fully complementary target EMDB-75677, PDB-11gi: EMDB-75678, PDB-11gj: EMDB-75679, PDB-11gk: |
| 化合物 | ![]() ChemComp-MG: ![]() ChemComp-HOH: |
| 由来 |
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キーワード | RNA BINDING PROTEIN/RNA / RNA binding protein / RNP / RNA / Argonaute2 / Ago2 / RNA BINDING PROTEIN-RNA complex |
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