Molecular insights into DNA interference by CRISPR-associated nuclease-helicase Cas3
Mobile genetic elements in bacteria are neutralized by a system based on clustered regularly interspaced short palindromic repeats (CRISPRs) and CRISPR-associated (Cas) proteins. Type I CRISPR-Cas systems use a “Cascade” ribonucleoprotein complex to guide RNA specifically to complementary sequence i...
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| Format: | Article |
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National Academy of Sciences
2014
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| Online Access: | https://eprints.nottingham.ac.uk/35113/ |
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| author | Gong, Bei Shin, Minsang Sun, Jiali Jung, Che-Hun Bolt, Edward L. van der oost, John Kim, Jeong-Sun |
| author_facet | Gong, Bei Shin, Minsang Sun, Jiali Jung, Che-Hun Bolt, Edward L. van der oost, John Kim, Jeong-Sun |
| author_sort | Gong, Bei |
| building | Nottingham Research Data Repository |
| collection | Online Access |
| description | Mobile genetic elements in bacteria are neutralized by a system based on clustered regularly interspaced short palindromic repeats (CRISPRs) and CRISPR-associated (Cas) proteins. Type I CRISPR-Cas systems use a “Cascade” ribonucleoprotein complex to guide RNA specifically to complementary sequence in invader double-stranded DNA (dsDNA), a process called “interference.” After target recogni- tion by Cascade, formation of an R-loop triggers recruitment of a Cas3 nuclease-helicase, completing the interference process by destroying the invader dsDNA. To elucidate the molecular mecha- nism of CRISPR interference, we analyzed crystal structures of Cas3 from the bacterium Thermobaculum terrenum, with and without a bound ATP analog. The structures reveal a histidine-aspartate (HD)-type nuclease domain fused to superfamily-2 (SF2) helicase domains and a distinct C-terminal domain. Binding of ATP analog at the interface of the SF2 helicase RecA-like domains rearranges a motif V with implications for the enzyme mechanism. The HD- nucleolytic site contains two metal ions that are positioned at the end of a proposed nucleic acid-binding tunnel running through the SF2 helicase structure. This structural alignment suggests a mecha- nism for 3′ to 5′ nucleolytic processing of the displaced strand of invader DNA that is coordinated with ATP-dependent 3′ to 5′ trans- location of Cas3 along DNA. In agreement with biochemical studies, the presented Cas3 structures reveal important mechanistic details on the neutralization of genetic invaders by type I CRISPR-Cas systems. |
| first_indexed | 2025-11-14T19:25:12Z |
| format | Article |
| id | nottingham-35113 |
| institution | University of Nottingham Malaysia Campus |
| institution_category | Local University |
| last_indexed | 2025-11-14T19:25:12Z |
| publishDate | 2014 |
| publisher | National Academy of Sciences |
| recordtype | eprints |
| repository_type | Digital Repository |
| spelling | nottingham-351132020-05-04T16:53:21Z https://eprints.nottingham.ac.uk/35113/ Molecular insights into DNA interference by CRISPR-associated nuclease-helicase Cas3 Gong, Bei Shin, Minsang Sun, Jiali Jung, Che-Hun Bolt, Edward L. van der oost, John Kim, Jeong-Sun Mobile genetic elements in bacteria are neutralized by a system based on clustered regularly interspaced short palindromic repeats (CRISPRs) and CRISPR-associated (Cas) proteins. Type I CRISPR-Cas systems use a “Cascade” ribonucleoprotein complex to guide RNA specifically to complementary sequence in invader double-stranded DNA (dsDNA), a process called “interference.” After target recogni- tion by Cascade, formation of an R-loop triggers recruitment of a Cas3 nuclease-helicase, completing the interference process by destroying the invader dsDNA. To elucidate the molecular mecha- nism of CRISPR interference, we analyzed crystal structures of Cas3 from the bacterium Thermobaculum terrenum, with and without a bound ATP analog. The structures reveal a histidine-aspartate (HD)-type nuclease domain fused to superfamily-2 (SF2) helicase domains and a distinct C-terminal domain. Binding of ATP analog at the interface of the SF2 helicase RecA-like domains rearranges a motif V with implications for the enzyme mechanism. The HD- nucleolytic site contains two metal ions that are positioned at the end of a proposed nucleic acid-binding tunnel running through the SF2 helicase structure. This structural alignment suggests a mecha- nism for 3′ to 5′ nucleolytic processing of the displaced strand of invader DNA that is coordinated with ATP-dependent 3′ to 5′ trans- location of Cas3 along DNA. In agreement with biochemical studies, the presented Cas3 structures reveal important mechanistic details on the neutralization of genetic invaders by type I CRISPR-Cas systems. National Academy of Sciences 2014-09-26 Article PeerReviewed Gong, Bei, Shin, Minsang, Sun, Jiali, Jung, Che-Hun, Bolt, Edward L., van der oost, John and Kim, Jeong-Sun (2014) Molecular insights into DNA interference by CRISPR-associated nuclease-helicase Cas3. Proceedings of the National Academy of Sciences, 111 (46). pp. 16359-16364. ISSN 1091-6490 Cas3 CRISPR Cascade Bacterial Immunity Cas Proteins http://www.pnas.org/content/111/46/16359 doi:10.1073/pnas.1410806111 doi:10.1073/pnas.1410806111 |
| spellingShingle | Cas3 CRISPR Cascade Bacterial Immunity Cas Proteins Gong, Bei Shin, Minsang Sun, Jiali Jung, Che-Hun Bolt, Edward L. van der oost, John Kim, Jeong-Sun Molecular insights into DNA interference by CRISPR-associated nuclease-helicase Cas3 |
| title | Molecular insights into DNA interference by CRISPR-associated nuclease-helicase Cas3 |
| title_full | Molecular insights into DNA interference by CRISPR-associated nuclease-helicase Cas3 |
| title_fullStr | Molecular insights into DNA interference by CRISPR-associated nuclease-helicase Cas3 |
| title_full_unstemmed | Molecular insights into DNA interference by CRISPR-associated nuclease-helicase Cas3 |
| title_short | Molecular insights into DNA interference by CRISPR-associated nuclease-helicase Cas3 |
| title_sort | molecular insights into dna interference by crispr-associated nuclease-helicase cas3 |
| topic | Cas3 CRISPR Cascade Bacterial Immunity Cas Proteins |
| url | https://eprints.nottingham.ac.uk/35113/ https://eprints.nottingham.ac.uk/35113/ https://eprints.nottingham.ac.uk/35113/ |