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- W4380870352 abstract "Natural prokaryotic defense via the CRISPR-Cas system requires spacer integration into the CRISPR array in a process called adaptation. To search for adaptation proteins with enhanced capabilities, we established a robust perpetual DNA packaging and transfer (PeDPaT) system that uses a strain of T7 phage to package plasmids and transfer them without killing the host, and then uses a different strain of T7 phage to repeat the cycle. We used PeDPaT to identify better adaptation proteins-Cas1 and Cas2-by enriching mutants that provide higher adaptation efficiency. We identified two mutant Cas1 proteins that show up to 10-fold enhanced adaptation in vivo. In vitro, one mutant has higher integration and DNA binding activities, and another has a higher disintegration activity compared to the wild-type Cas1. Lastly, we showed that their specificity for selecting a protospacer adjacent motif is decreased. The PeDPaT technology may be used for many robust screens requiring efficient and effortless DNA transduction." @default.
- W4380870352 created "2023-06-17" @default.
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- W4380870352 date "2023-06-16" @default.
- W4380870352 modified "2023-09-27" @default.
- W4380870352 title "Highly active CRISPR-adaptation proteins revealed by a robust enrichment technology" @default.
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- W4380870352 doi "https://doi.org/10.1093/nar/gkad510" @default.
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