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Title: Mechanism of CRISPR-RNA guided recognition of DNA targets in Escherichia coli

Journal Article · · Nucleic Acids Research
DOI:https://doi.org/10.1093/nar/gkv793· OSTI ID:1252758
 [1];  [1];  [1];  [1];  [2];  [1]
  1. Montana State Univ., Bozeman, MT (United States)
  2. Johns Hopkins School of Public Health, Baltimore, MD (United States)

In bacteria and archaea, short fragments of foreign DNA are integrated into Clustered Regularly Interspaced Short Palindromic Repeat (CRISPR) loci, providing a molecular memory of previous encounters with foreign genetic elements. In Escherichia coli, short CRISPR-derived RNAs are incorporated into a multi-subunit surveillance complex called Cascade (CRISPR-associated complex for antiviral defense). Recent structures of Cascade capture snapshots of this seahorse-shaped RNA-guided surveillance complex before and after binding to a DNA target. Here we determine a 3.2 Å x-ray crystal structure of Cascade in a new crystal form that provides insight into the mechanism of double-stranded DNA binding. Molecular dynamic simulations performed using available structures reveal functional roles for residues in the tail, backbone and belly subunits of Cascade that are critical for binding double-stranded DNA. Structural comparisons are used to make functional predictions and these predictions are tested in vivo and in vitro. Collectively, the results in this study reveal underlying mechanisms involved in target-induced conformational changes and highlight residues important in DNA binding and protospacer adjacent motif recognition.

Research Organization:
Argonne National Laboratory (ANL), Argonne, IL (United States)
Sponsoring Organization:
USDOE; National Science Foundation (NSF); National Inst. of Health
Grant/Contract Number:
AC02-06CH11357; AC02-76SF00515; P41GM103393; F32 GM108436; P20GM10347; R01GM097330; P20GM103500; R01GM108888; EPS-110134
OSTI ID:
1252758
Journal Information:
Nucleic Acids Research, Vol. 43, Issue 17; ISSN 0305-1048
Publisher:
Oxford University PressCopyright Statement
Country of Publication:
United States
Language:
ENGLISH
Citation Metrics:
Cited by: 38 works
Citation information provided by
Web of Science

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Cited By (17)

Structural basis for promiscuous PAM recognition in type I–E Cascade from E. coli journal February 2016
Anti-CRISPR: discovery, mechanism and function journal October 2017
Keeping crispr in check: diverse mechanisms of phage-encoded anti-crisprs journal May 2019
Competition between mobile genetic elements drives optimization of a phage-encoded CRISPR-Cas system: insights from a natural arms race
  • McKitterick, Amelia C.; LeGault, Kristen N.; Angermeyer, Angus
  • Philosophical Transactions of the Royal Society B: Biological Sciences, Vol. 374, Issue 1772 https://doi.org/10.1098/rstb.2018.0089
journal March 2019
Competition between mobile genetic elements drives optimization of a phage-encoded CRISPR-Cas system: Insights from a natural arms-race posted_content August 2018
Direct visualization of native CRISPR target search in live bacteria reveals Cascade DNA surveillance mechanism journal March 2019
CRISPR-Cas: Adapting to change journal April 2017
Diversity of CRISPR-Cas immune systems and molecular machines journal November 2015
Direct Visualization of Native CRISPR Target Search in Live Bacteria Reveals Cascade DNA Surveillance Mechanism journal January 2020
Real-Time Observation of Target Search by the CRISPR Surveillance Complex Cascade journal February 2018
Decision-Making in Cascade Complexes Harboring crRNAs of Altered Length journal September 2019
The CRISPR RNA-guided surveillance complex in Escherichia coli accommodates extended RNA spacers journal May 2016
Modulating the Cascade architecture of a minimal Type I-F CRISPR-Cas system journal May 2016
Primed CRISPR adaptation in Escherichia coli cells does not depend on conformational changes in the Cascade effector complex detected in Vitro journal March 2018
Role of nucleotide identity in effective CRISPR target escape mutations journal August 2018
Assembly and translocation of a CRISPR-Cas primed acquisition complex journal October 2017
The CRISPR conundrum: evolve and maybe die, or survive and risk stagnation journal June 2018

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