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dc.contributor.authorKim, Sungchul
dc.contributor.authorLoeff, Luuk
dc.contributor.authorColombo, Sabina
dc.contributor.authorJergic, Slobodan
dc.contributor.authorBrouns, Stan J. J.
dc.contributor.authorJoo, Chirlmin
dc.date.accessioned2020-02-24T10:38:44Z
dc.date.available2020-02-24T10:38:44Z
dc.date.issued2020-02-19
dc.date.submitted2019-05-28
dc.identifier.citationKim, S., Loeff, L., Colombo, S., Jergic, S., Brouns, S. J. J., & Joo, C. (2020). Selective loading and processing of prespacers for precise CRISPR adaptation. Nature. doi:10.1038/s41586-020-2018-1
dc.identifier.doi10.1038/s41586-020-2018-1
dc.identifier.urihttp://hdl.handle.net/10754/661642
dc.description.abstractCRISPR–Cas immunity protects prokaryotes against invading genetic elements1. It uses the highly conserved Cas1–Cas2 complex to establish inheritable memory (spacers)2,3,4,5. How Cas1–Cas2 acquires spacers from foreign DNA fragments (prespacers) and integrates them into the CRISPR locus in the correct orientation is unclear6,7. Here, using the high spatiotemporal resolution of single-molecule fluorescence, we show that Cas1–Cas2 selects precursors of prespacers from DNA in various forms—including single-stranded DNA and partial duplexes—in a manner that depends on both the length of the DNA strand and the presence of a protospacer adjacent motif (PAM) sequence. We also identify DnaQ exonucleases as enzymes that process the Cas1–Cas2-loaded prespacer precursors into mature prespacers of a suitable size for integration. Cas1–Cas2 protects the PAM sequence from maturation, which results in the production of asymmetrically trimmed prespacers and the subsequent integration of spacers in the correct orientation. Our results demonstrate the kinetic coordination of prespacer precursor selection and PAM trimming, providing insight into the mechanisms that underlie the integration of functional spacers in the CRISPR loci.
dc.description.sponsorshipWe thank A. C. Haagsma and T. Künne for providing Cas1–Cas2 vectors and proteins; S. Leachman, N. Dekker and the members of the C.J. and S.J.J.B. laboratories for discussions; and T. J. Cui for discussions on kinetic models. S.J. thanks N. Dixon for guidance. S.K. was partly funded by a Marie Skłodowska-Curie grant (753528); C.J. and S.J.J.B. were funded by the Foundation for Fundamental Research on Matter (15PR3188); and S.J. was funded by a collaborative grant from King Abdullah University of Science and Technology, Saudi Arabia (OSR-2015-CRG4-2644).
dc.publisherSpringer Nature
dc.relation.urlhttp://www.nature.com/articles/s41586-020-2018-1
dc.rightsArchived with thanks to Nature
dc.titleSelective loading and processing of prespacers for precise CRISPR adaptation
dc.typeArticle
dc.identifier.journalNature
dc.rights.embargodate2020-08-19
dc.eprint.versionPost-print
dc.contributor.institutionKavli Institute of Nanoscience, Department of Bionanoscience, Delft University of Technology, Delft, The Netherlands.
dc.contributor.institutionPresent address: Department of Biochemistry, University of Zurich, Zurich, Switzerland
dc.contributor.institutionMolecular Horizons and School of Chemistry and Molecular Bioscience, University of Wollongong, Wollongong, New South Wales, Australia.
dc.contributor.institutionIllawarra Health and Medical Research Institute, Wollongong, New South Wales, Australia.
dc.date.accepted2019-12-19
dc.date.published-online2020-02-19
dc.date.published-print2020-03


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