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Structures of the holo CRISPR RNA-guided transposon integration complex
Open accessPreprint — published as 10.1038/s41586-022-05573-5 · Paper page
Abstract
CRISPR-associated transposons (CAST) are programmable mobile elements that insert large DNA cargo by an RNA-guided mechanism. Multiple conserved components act in concert at the target site through formation of an integration complex (transpososome). We reconstituted the type V-K CAST transpososome from Scytonema hofmannii (ShCAST) and determined the structure using cryo-EM. Transpososome architecture ensures orientation-specific association: AAA+ regulator TnsC has defined polarity and length, with dedicated interaction interfaces for other CAST components. Interestingly, transposase (TnsB)-TnsC interactions we observe contribute to stimulating TnsC’s ATP hydrolysis activity. TnsC deviates from previously observed helical configurations of TnsC, and target DNA does not track with TnsC protomers. Consequently, TnsC makes new, functionally important protein-DNA interactions throughout the transpososome. Finally, two distinct transpososome populations suggests that associations with the CRISPR effector are flexible. These ShCAST transpososome structures significantly enhances our understanding of CAST transposition systems and suggests avenues for improving CAST transposition for precision genome-editing applications.
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Metadata
- Authors
- Park, J.-U., Tsai, A. W.-L., Rizo, A. N., Truong, V. H., Wellner, T. X., Schargel, R. D., & Kellogg, E. H.
- Affiliations
- Cornell University (US)
- Corresponding author
- Kellogg, Elizabeth H.
- ORCID
- Venue
- Nature
- Publisher
- openRxiv
- Published
- 2022-10-12
- Volume
- 613
- Issue
- 7945
- Pages
- 775-782
- ISSN
- 0028-0836 (ISSN-L)
- PMC
- PMC9876797
- OpenAlex
- W4310155672
- Cited by
- 80
- References
- 1
- Citations by year
- 2026: 22 · 2025: 21 · 2024: 21 · 2023: 15 · 2022: 1
- FWCI
- 4.73
- Type
- journal article
- Language
- en
- Open access
- hybrid
- doi.org
- Licence
- cc-by
- Locations
- Nature (publishedVersion, cc-by)
- bioRxiv (Cold Spring Harbor Laboratory) (acceptedVersion)
- PubMed Central (publishedVersion, cc-by)
- PubMed (publishedVersion)
- RePEc: Research Papers in Economics (submittedVersion)
- Funders
- Simons Foundation (SF 349247)
- National Institutes of Health (1s10od030470-01, MCB200090)
- National Institute of General Medical Sciences (U24GM129539, R01GM144566)
- Common Fund (U24 GM129539)
- Topics
- Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › CRISPR and Genetic Engineering
- Life Sciences › Biochemistry, Genetics and Molecular Biology › Genetics › Bacterial Genetics and Biotechnology
- Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Biochemical and Structural Characterization
- Keywords
- transpososome, cascades, ribosomal protein S15, R-loops, protein-DNA interactions, transposition mechanism, genome editing
- MeSH terms
- Gene Editing, RNA, Guide, CRISPR-Cas Systems, Cyanobacteria, Bacterial Proteins, DNA Transposable Elements, DNA-Binding Proteins, Endodeoxyribonucleases, Transposases, Holoenzymes, Cryoelectron Microscopy, Multiprotein Complexes, Ribosome Subunits, Clustered Regularly Interspaced Short Palindromic Repeats, CRISPR-Cas Systems, CRISPR-Associated Proteins
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