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-Structure paper
タイトル | A resurrected ancestor of Cas12a expands target access and substrate recognition for nucleic acid editing and detection. |
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ジャーナル・号・ページ | Nat Biotechnol, Year 2024 |
掲載日 | 2024年10月31日 |
著者 | Ylenia Jabalera / Igor Tascón / Sara Samperio / Jorge P López-Alonso / Monika Gonzalez-Lopez / Ana M Aransay / Guillermo Abascal-Palacios / Chase L Beisel / Iban Ubarretxena-Belandia / Raul Perez-Jimenez / |
PubMed 要旨 | The properties of Cas12a nucleases constrict the range of accessible targets and their applications. In this study, we applied ancestral sequence reconstruction (ASR) to a set of Cas12a orthologs ...The properties of Cas12a nucleases constrict the range of accessible targets and their applications. In this study, we applied ancestral sequence reconstruction (ASR) to a set of Cas12a orthologs from hydrobacteria to reconstruct a common ancestor, ReChb, characterized by near-PAMless targeting and the recognition of diverse nucleic acid activators and collateral substrates. ReChb shares 53% sequence identity with the closest Cas12a ortholog but no longer requires a T-rich PAM and can achieve genome editing in human cells at sites inaccessible to the natural FnCas12a or the engineered and PAM-flexible enAsCas12a. Furthermore, ReChb can be triggered not only by double-stranded DNA but also by single-stranded RNA and DNA targets, leading to non-specific collateral cleavage of all three nucleic acid substrates with similar efficiencies. Finally, tertiary and quaternary structures of ReChb obtained by cryogenic electron microscopy reveal the molecular details underlying its expanded biophysical activities. Overall, ReChb expands the application space of Cas12a nucleases and underscores the potential of ASR for enhancing CRISPR technologies. |
リンク | Nat Biotechnol / PubMed:39482449 |
手法 | EM (単粒子) |
解像度 | 3.08 - 3.75 Å |
構造データ | EMDB-18691, PDB-8qwd: EMDB-18692: Apo ReChb , Rec1 improved EMDB-18693, PDB-8qwe: EMDB-18694: Quaternary complex of ReChb - crRNA - target dsDNA - collateral dsDNA |
化合物 | ChemComp-MG: ChemComp-HOH: |
由来 |
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キーワード | BIOSYNTHETIC PROTEIN / Cas / cryo-EM / ancestral sequence reconstruction / biotechnology / DNA / RNA |