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Title: Real-time observation of DNA recognition and rejection by the RNA-guided endonuclease Cas9

Journal Article · · Nature Communications
DOI:https://doi.org/10.1038/ncomms12778· OSTI ID:1623849
 [1];  [2];  [3];  [4]; ORCiD logo [5]
  1. Johns Hopkins Univ. School of Medicine, Baltimore, MD (United States). Dept. of Biophysics and Biophysical Chemistry, and Dept. of Biomedical Engineering; Univ. of Illinois at Urbana-Champaign, Urbana, IL (United States). Center for Biophysics and Quantitative Biology
  2. Univ. of California, Berkeley, CA (United States). Dept. of Chemistry
  3. Univ. of Chicago, Chicago, IL (United States). Dept. of Biochemistry and Molecular Biology; Univ. of Illinois at Urbana-Champaign, Urbana, IL (United States). Dept. of Physics and Center for the Physics of Living Cells; Howard Hughes Medical Institute, Baltimore, MD (United States)
  4. Univ. of California, Berkeley, CA (United States). Dept. of Chemistry and Dept. of Molecular and Cell Biology, an Innovative Genomics Initiative; Howard Hughes Medical Institute, Berkeley, CA (United States); Lawrence Berkeley National Lab (LBNL), Berkeley, CA (United States). Physical Biosciences Div.
  5. Johns Hopkins Univ., School of Medicine, Baltimore, MD (United States). Dept. of Biophysics and Biophysical Chemistry; Johns Hopkins Univ., Baltimore, MD (United States). Dept. of Biophysics, and Dept. of Biomedical Engineering; Univ. of Illinois at Urbana-Champaign, Urbana, IL (United States). Center for Biophysics and Quantitative Biology, Dept. of Physics, and Center for the Physics of Living Cells; Howard Hughes Medical Institute, Baltimore, 21205, Maryland, USA

Binding specificity of Cas9–guide RNA complexes to DNA is important for genome-engineering applications; however, how mismatches influence target recognition/rejection kinetics is not well understood. Here we used single-molecule FRET to probe real-time interactions between Cas9–RNA and DNA targets. The bimolecular association rate is only weakly dependent on sequence; however, the dissociation rate greatly increases from <0.006 s-1 to >2 s-1 upon introduction of mismatches proximal to protospacer-adjacent motif (PAM), demonstrating that mismatches encountered early during heteroduplex formation induce rapid rejection of off-target DNA. In contrast, PAM-distal mismatches up to 11 base pairs in length, which prevent DNA cleavage, still allow formation of a stable complex (dissociation rate <0.006 s-1), suggesting that extremely slow rejection could sequester Cas9–RNA, increasing the Cas9 expression level necessary for genome-editing, thereby aggravating off-target effects. We also observed at least two different bound FRET states that may represent distinct steps in target search and proofreading.

Research Organization:
Lawrence Berkeley National Lab (LBNL), Berkeley, CA (United States)
Sponsoring Organization:
USDOE Office of Science (SC); National Science Foundation (NSF); National Institutes of Health (NIH)
Grant/Contract Number:
AC02-05CH11231; PHY-1430124; 1244557; GM065367; GM112659
OSTI ID:
1623849
Journal Information:
Nature Communications, Vol. 7, Issue 1; ISSN 2041-1723
Publisher:
Nature Publishing GroupCopyright Statement
Country of Publication:
United States
Language:
English

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Cited By (45)

CRISPR/Cas Systems in Genome Editing: Methodologies and Tools for sgRNA Design, Off‐Target Evaluation, and Strategies to Mitigate Off‐Target Effects journal March 2020
Genomes in Focus: Development and Applications of CRISPR-Cas9 Imaging Technologies journal February 2018
Strategies for Developing CRISPR‐Based Gene Editing Methods in Bacteria journal November 2019
Recent advancement of light‐based single‐molecule approaches for studying biomolecules journal February 2019
Hit and go CAS9 delivered through a lentiviral based self-limiting circuit journal May 2017
A CRISPRi screen in E. coli reveals sequence-specific toxicity of dCas9 journal May 2018
A CRISPR–Cas9-triggered strand displacement amplification method for ultrasensitive DNA detection journal November 2018
Controlling CRISPR-Cas9 with ligand-activated and ligand-deactivated sgRNAs journal May 2019
Visualisation of dCas9 target search in vivo using an open-microscopy framework journal August 2019
Enhancing gene editing specificity by attenuating DNA cleavage kinetics journal July 2019
Mechanisms of improved specificity of engineered Cas9s revealed by single-molecule FRET analysis journal April 2018
CRISPR RNA-guided autonomous delivery of Cas9 journal December 2018
Nuclease dead Cas9 is a programmable roadblock for DNA replication journal September 2019
Acrylamide-dT: a polymerisable nucleoside for DNA incorporation journal January 2019
Mechanism of duplex DNA destabilization by RNA-guided Cas9 nuclease during target interrogation journal May 2017
CRISPR-Cas9 conformational activation as elucidated from enhanced molecular simulations journal June 2017
Real-time observation of DNA target interrogation and product release by the RNA-guided endonuclease CRISPR Cpf1 (Cas12a) journal May 2018
Francisella novicida Cas9 interrogates genomic DNA with very high specificity and can be used for mammalian genome editing journal September 2019
Unified energetics analysis unravels SpCas9 cleavage activity for optimal gRNA design journal April 2019
Facilitated diffusion of Argonaute-mediated target search journal May 2019
Evaluating single-particle tracking by photo-activation localization microscopy (sptPALM) in Lactococcus lactis journal March 2019
ERASE: a novel surface reconditioning strategy for single-molecule experiments journal November 2018
Divalent cations promote TALE DNA-binding specificity journal December 2019
An open microscopy framework suited for tracking dCas9 in live bacteria posted_content October 2018
Increasing the efficiency of CRISPR-Cas9-VQR precise genome editing in rice journal August 2017
The post-PAM interaction of RNA-guided spCas9 with DNA dictates its target binding and dissociation journal November 2019
Core Hairpin Structure of SpCas9 sgRNA Functions in a Sequence- and Spatial Conformation–Dependent Manner journal June 2020
Versatile transcription control based on reversible dCas9 binding journal July 2019
Real‐time observation of flexible domain movements in CRISPR–Cas9 journal April 2018
CRISPR /Cas9 searches for a protospacer adjacent motif by lateral diffusion journal December 2018
A Low-Cost Time-Correlated Single Photon Counting Portable DNA Analyzer journal June 2019
High-throughput biochemical profiling reveals sequence determinants of dCas9 off-target binding and unbinding journal May 2017
The initiation, propagation and dynamics of CRISPR-SpyCas9 R-loop complex journal November 2017
ERASE: a novel surface reconditioning strategy for single-molecule experiments posted_content March 2018
Nuclease dead Cas9 is a programmable roadblock for DNA replication posted_content October 2018
CRISPR-Cas9 conformational activation as elucidated from enhanced molecular simulations text January 2017
Molecular Mechanism of Off-Target Effects in CRISPR-Cas9 journal February 2019
A conformational checkpoint between DNA binding and cleavage by CRISPR-Cas9 journal August 2017
Deciphering Off-Target Effects in CRISPR-Cas9 through Accelerated Molecular Dynamics journal March 2019
Real-space and real-time dynamics of CRISPR-Cas9 visualized by high-speed atomic force microscopy journal November 2017
Mapping the sugar dependency for rational generation of a DNA-RNA hybrid-guided Cas9 endonuclease journal November 2017
Editor's cut: DNA cleavage by CRISPR RNA-guided nucleases Cas9 and Cas12a journal December 2019
Game-Theoretical Modeling of Interviral Conflicts Mediated by Mini-CRISPR Arrays journal March 2020
Spontaneous Embedding of DNA Mismatches Within the RNA:DNA Hybrid of CRISPR-Cas9 journal March 2020
GSSMD: New metric for robust and interpretable assay quality assessment and hit selection preprint January 2020

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