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Title: The CRISPR RNA-guided surveillance complex in Escherichia coli accommodates extended RNA spacers

Journal Article · · Nucleic Acids Research
DOI:https://doi.org/10.1093/nar/gkw421· OSTI ID:1360145

Bacteria and archaea acquire resistance to foreign genetic elements by integrating fragments of foreign DNA into CRISPR (clustered regularly interspaced short palindromic repeats) loci. In Escherichia coli, CRISPR-derived RNAs (crRNAs) assemble with Cas proteins into a multi-subunit surveillance complex called Cascade (CRISPR-associated complex for antiviral defense). Cascade recognizes DNA targets via protein-mediated recognition of a protospacer adjacent motif and complementary base pairing between the crRNA spacer and the DNA target. Previously determined structures of Cascade showed that the crRNA is stretched along an oligomeric protein assembly, leading us to ask how crRNA length impacts the assembly and function of this complex. We found that extending the spacer portion of the crRNA resulted in larger Cascade complexes with altered stoichiometry and preserved in vitro binding affinity for target DNA. Longer spacers also preserved the in vivo ability of Cascade to repress target gene expression and to recruit the Cas3 endonuclease for target degradation. Lastly, longer spacers exhibited enhanced silencing at particular target locations and were sensitive to mismatches within the extended region. These findings demonstrate the flexibility of the Type I-E CRISPR machinery and suggest that spacer length can be modified to fine-tune Cascade activity.

Research Organization:
Univ. of Colorado, Boulder, CO (United States)
Sponsoring Organization:
USDOE Office of Science (SC)
Grant/Contract Number:
SC0012518
OSTI ID:
1360145
Journal Information:
Nucleic Acids Research, Vol. 44, Issue 15; ISSN 0305-1048
Publisher:
Oxford University PressCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 34 works
Citation information provided by
Web of Science

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Cited By (11)

Determining the Specificity of Cascade Binding, Interference, and Primed Adaptation In Vivo in the Escherichia coli Type I-E CRISPR-Cas System journal April 2018
A CRISPR RNA Is Closely Related With the Size of the Cascade Nucleoprotein Complex journal October 2019
Determining the specificity of Cascade binding, interference, and primed adaptation in vivo in the Escherichia coli type I-E CRISPR-Cas system posted_content March 2018
Decision-Making in Cascade Complexes Harboring crRNAs of Altered Length journal September 2019
Target preference of Type III-A CRISPR-Cas complexes at the transcription bubble journal July 2019
The repurposing of type I-E CRISPR-Cascade for gene activation in plants journal October 2019
The nuts and bolts of the Haloferax CRISPR-Cas system I-B journal May 2018
Altered stoichiometry Escherichia coli Cascade complexes with shortened CRISPR RNA spacers are capable of interference and primed adaptation journal October 2016
The spacer size of I-B CRISPR is modulated by the terminal sequence of the protospacer journal April 2017
Primed adaptation tolerates extensive structural and size variations of the CRISPR RNA guide in Haloarcula hispanica journal April 2019
CRISPRi-mediated metabolic engineering of E. coli for O-methylated anthocyanin production journal January 2017