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-Structure paper
| タイトル | Structural mechanism of LINE-1 target-primed reverse transcription. |
|---|---|
| ジャーナル・号・ページ | Science, Vol. 388, Issue 6745, Page eads8412, Year 2025 |
| 掲載日 | 2025年4月25日 |
著者 | George E Ghanim / Hongmiao Hu / Jerome Boulanger / Thi Hoang Duong Nguyen / ![]() |
| PubMed 要旨 | Long interspersed element-1 (LINE-1) retrotransposons are the only active autonomous transposable elements in humans. They propagate by reverse transcribing their messenger RNA into new genomic ...Long interspersed element-1 (LINE-1) retrotransposons are the only active autonomous transposable elements in humans. They propagate by reverse transcribing their messenger RNA into new genomic locations by a process called target-primed reverse transcription (TPRT). In this work, we present four cryo-electron microscopy structures of the human LINE-1 TPRT complex, revealing the conformational dynamics of open reading frame 2 protein (ORF2p) and its extensive remodeling of the target DNA for TPRT initiation. We observe nicking of the DNA second strand during reverse transcription of the first strand. Structure prediction identifies high-confidence binding sites for LINE-1-associated factors-namely proliferating cell nuclear antigen (PCNA) and cytoplasmic poly(A)-binding protein 1 (PABPC1)-on ORF2p. Together with our structural data, this suggests a mechanism by which these factors regulate retrotransposition and supports a model for TPRT that accounts for retrotransposition outcomes observed in cells. |
リンク | Science / PubMed:40048554 / PubMed Central |
| 手法 | EM (単粒子) |
| 解像度 | 2.3 - 3.1 Å |
| 構造データ | EMDB-52070, PDB-9hdo: EMDB-52071, PDB-9hdp: EMDB-52072, PDB-9hdq: EMDB-52073, PDB-9hdr: |
| 化合物 | ![]() ChemComp-MG: ![]() ChemComp-ZN: ![]() ChemComp-D3T: |
| 由来 |
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キーワード | RNA BINDING PROTEIN / LINE-1 / L1 / ORF2p / Reverse transcriptase / endonuclease / DNA / RNA |
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homo sapiens (ヒト)

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