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-Structure paper
| タイトル | Structures of vertebrate R2 retrotransposon complexes during target-primed reverse transcription and after second-strand nicking. |
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| ジャーナル・号・ページ | Sci Adv, Vol. 11, Issue 25, Page eadu5533, Year 2025 |
| 掲載日 | 2025年6月20日 |
著者 | Akanksha Thawani / Anthony Rodríguez-Vargas / Briana Van Treeck / Nozhat T Hassan / David L Adelson / Eva Nogales / Kathleen Collins / ![]() |
| PubMed 要旨 | R2 retrotransposons are site-specific eukaryotic non-long terminal repeat retrotransposons that copy and paste into gene loci encoding ribosomal RNAs. Recently, we demonstrated that avian A-clade R2 ...R2 retrotransposons are site-specific eukaryotic non-long terminal repeat retrotransposons that copy and paste into gene loci encoding ribosomal RNAs. Recently, we demonstrated that avian A-clade R2 proteins achieve efficient and precise insertion of transgenes into their native safe-harbor loci in human cells. The features of A-clade R2 proteins that support gene insertion are not well characterized. Here, we report high-resolution cryo-electron microscopy structures of two vertebrate A-clade R2 proteins at the initiation of target-primed reverse transcription and after cDNA synthesis and second-strand nicking. Using biochemical and cellular assays, we illuminate the basis for high selectivity of template use and unique roles for each of the three zinc-finger domains in nucleic acid recognition. Reverse transcriptase active site architecture is reinforced by an unanticipated insertion motif specific to vertebrate A-clade R2 proteins. Our work provides the first insights into A-clade R2 protein structure during gene insertion and may enable future improvement and adaptation of R2-based systems for precise transgene insertion. |
リンク | Sci Adv / PubMed:40540573 / PubMed Central |
| 手法 | EM (単粒子) |
| 解像度 | 3.2 - 4.6 Å |
| 構造データ | EMDB-49515, PDB-9nl2: EMDB-49516, PDB-9nl3: EMDB-49517, PDB-9nl4: |
| 化合物 | ![]() ChemComp-MG: ![]() ChemComp-ZN: ![]() ChemComp-TTP: |
| 由来 |
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キーワード | RNA BINDING PROTEIN/RNA/DNA / Retrotransposon / Reverse transcriptase / RNA BINDING PROTEIN-RNA-DNA complex |
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platysternon megacephalum (爬虫類)
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