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-Structure paper
| タイトル | Structural basis of directionality control in large serine integrases. |
|---|---|
| ジャーナル・号・ページ | bioRxiv, Year 2025 |
| 掲載日 | 2025年1月13日 |
著者 | Heewhan Shin / Ying Pigli / Tania Peña Reyes / James R Fuller / Femi J Olorunniji / Phoebe A Rice / ![]() |
| PubMed 要旨 | Large serine integrases (LSIs) catalyze unidirectional site-specific DNA recombination reactions, yet those reactions are reversed by the presence of a cognate recombination directionality factor ...Large serine integrases (LSIs) catalyze unidirectional site-specific DNA recombination reactions, yet those reactions are reversed by the presence of a cognate recombination directionality factor (RDF). Mechanistic understanding of directionality control has been hampered by a lack of structural information. Here, we use cryo-electron microscopy (cryo-EM) to determine the structures of six SPbeta integrase-DNA complexes along the integrative (-RDF) and excisive (+RDF) reaction pathways, at 4.16-7.18Å resolution. Our findings reveal how RDF-mediated repositioning of an integrase subdomain (1) dictates which pairs of DNA sites can be assembled into a synaptic complex to initiate recombination and (2) dictates which product complexes will be conformationally locked, preventing the back reaction. These mechanistic insights provide a conceptual framework for engineering efficient and versatile genome editing tools. |
リンク | bioRxiv / PubMed:39803483 / PubMed Central |
| 手法 | EM (単粒子) |
| 解像度 | 3.31 - 7.1 Å |
| 構造データ | EMDB-72552, PDB-9y66: EMDB-72632, PDB-9y6v: |
| 化合物 | ![]() ChemComp-ZN: |
| 由来 |
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キーワード | RECOMBINATION / Site-specific DNA Recombinase / Large serine integrase / DNA binding domains / Recombinase / Resolvase / Zinc ribbon recombinase |
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spbetavirus spbeta (ウイルス)
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