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-Structure paper
| タイトル | Local structural dynamics of Rad51 protomers revealed by cryo-electron microscopy of Rad51-ssDNA filaments. |
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| ジャーナル・号・ページ | Nucleic Acids Res, Vol. 53, Issue 3, Year 2025 |
| 掲載日 | 2025年1月24日 |
著者 | Jie Liu / Steven K Gore / Wolf-Dietrich Heyer / ![]() |
| PubMed 要旨 | Homologous recombination (HR) is a high-fidelity repair mechanism for double-strand breaks. Rad51 is the key enzyme that forms filaments on single-stranded DNA (ssDNA) to catalyze homology search and ...Homologous recombination (HR) is a high-fidelity repair mechanism for double-strand breaks. Rad51 is the key enzyme that forms filaments on single-stranded DNA (ssDNA) to catalyze homology search and DNA strand exchange in recombinational DNA repair. In this study, we employed single-particle cryogenic electron microscopy (cryo-EM) to ascertain the density map of the wild-type budding yeast Rad51-ssDNA filament bound to ADP-AlF3, achieving a resolution of 2.35 Å without imposing helical symmetry. The model assigned 6 Rad51 protomers, 24 nt of DNA, and 6 bound ADP-AlF3. It shows 6-fold symmetry implying monomeric building blocks, unlike the structure of the Rad51-I345T mutant filament with three-fold symmetry implying dimeric building blocks, for which the structural comparisons provide a satisfying mechanistic explanation. This image analysis enables comprehensive comparisons of individual Rad51 protomers within the filament and reveals local conformational movements of amino acid side chains. Notably, R293 in Loop 1 adopts multiple conformations to facilitate L296 and V331 in separating and twisting the DNA triplets. We also analyzed the crystal structure of Rad51-I345T and the predicted structure of yeast Rad51-K342E using the Rad51-ssDNA structure from this study as a reference. |
リンク | Nucleic Acids Res / PubMed:39898551 / PubMed Central |
| 手法 | EM (単粒子) |
| 解像度 | 2.4 - 2.52 Å |
| 構造データ | EMDB-44104, PDB-9b2d: ![]() PDB-9ed3: |
| 化合物 | ![]() ChemComp-ADP: ![]() ChemComp-AF3: ![]() ChemComp-MG: |
| 由来 |
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キーワード | DNA BINDING PROTEIN/DNA / genome stability / recombination / Rad51 / DNA repair / DNA BINDING PROTEIN / DNA BINDING PROTEIN-DNA complex |
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