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Temperature-Responsive Competitive Inhibition of CRISPR-Cas9

Journal Article · · Molecular Cell
 [1];  [1];  [2];  [1];  [2];  [2];  [3];  [2];  [4]
  1. Univ. of California, Berkeley, CA (United States)
  2. Univ. of California, San Francisco, CA (United States)
  3. Univ. of California, Berkeley, CA (United States); Howard Hughes Medical Inst., Berkeley, CA (United States); Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
  4. Univ. of California, Berkeley, CA (United States); Innovative Genomics Inst., Berkeley, CA (United States); Howard Hughes Medical Inst., Berkeley, CA (United States); Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States); Gladstone Inst., San Francisco, CA (United States)

CRISPR-Cas immune systems utilize RNA-guided nucleases to protect bacteria from bacteriophage infection. Bacteriophages have in turn evolved inhibitory "anti-CRISPR" (Acr) proteins, including six inhibitors (AcrIIA1-AcrIIA6) that can block DNA cutting and genome editing by type II-A CRISPR-Cas9 enzymes. We show here that AcrIIA2 and its more potent homolog, AcrIIA2b, prevent Cas9 binding to DNA by occluding protein residues required for DNA binding. Cryo-EM-determined structures of AcrIIA2 or AcrIIA2b bound to S. pyogenes Cas9 reveal a mode of competitive inhibition of DNA binding that is distinct from other known Acrs. Differences in the temperature dependence of Cas9 inhibition by AcrIIA2 and AcrIIA2b arise from differences in both inhibitor structure and the local inhibitor-binding environment on Cas9. Finally, these findings expand the natural toolbox for regulating CRISPR-Cas9 genome editing temporally, spatially, and conditionally.

Research Organization:
Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)
Sponsoring Organization:
USDOE Office of Science (SC); Defense Advanced Research Projects Agency (DARPA)
Grant/Contract Number:
AC02-05CH11231
OSTI ID:
1604673
Journal Information:
Molecular Cell, Journal Name: Molecular Cell Journal Issue: 3 Vol. 73; ISSN 1097-2765
Publisher:
Cell Press - ElsevierCopyright Statement
Country of Publication:
United States
Language:
English

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Cited By (13)

Applying switchable Cas9 variants to in vivo gene editing for therapeutic applications journal August 2019
Sharpening the Molecular Scissors: Advances in Gene-Editing Technology journal January 2020
Keeping crispr in check: diverse mechanisms of phage-encoded anti-crisprs journal May 2019
Functional metagenomics-guided discovery of potent Cas9 inhibitors in the human microbiome journal September 2019
Anti‐CRISPRs: The natural inhibitors for CRISPR‐Cas systems journal May 2019
Listeria Phages Induce Cas9 Degradation to Protect Lysogenic Genomes journal July 2020
Structural insight into multistage inhibition of CRISPR-Cas12a by AcrVA4 journal August 2019
Machine learning predicts new anti-CRISPR proteins journal April 2020
Anti‐CRISPR AcrIIC3 discriminates between Cas9 orthologs via targeting the variable surface of the HNH nuclease domain journal August 2019
Anti‐CRISPR proteins targeting the CRISPR‐Cas system enrich the toolkit for genetic engineering journal November 2019
Allosteric inhibition of CRISPR-Cas9 by bacteriophage-derived peptides journal February 2020
The Synergy between CRISPR and Chemical Engineering journal September 2019
Structural and functional insights into the bona fide catalytic state of Streptococcus pyogenes Cas9 HNH nuclease domain journal July 2019

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