Discovery of widespread type I and type V CRISPR-Cas inhibitors

Bacterial CRISPR-Cas systems protect their host from bacteriophages and other mobile genetic elements. Mobile elements, in turn, encode various anti-CRISPR (Acr) proteins to inhibit the immune function of CRISPR-Cas. To date, Acr proteins have been discovered for type I (subtypes I-D, I-E, and I-F)...

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Published in:Science (American Association for the Advancement of Science) 2018-10, Vol.362 (6411), p.240-242
Main Authors: Marino, Nicole D, Zhang, Jenny Y, Borges, Adair L, Sousa, Alexander A, Leon, Lina M, Rauch, Benjamin J, Walton, Russell T, Berry, Joel D, Joung, J Keith, Kleinstiver, Benjamin P, Bondy-Denomy, Joseph
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Language:eng
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Summary:Bacterial CRISPR-Cas systems protect their host from bacteriophages and other mobile genetic elements. Mobile elements, in turn, encode various anti-CRISPR (Acr) proteins to inhibit the immune function of CRISPR-Cas. To date, Acr proteins have been discovered for type I (subtypes I-D, I-E, and I-F) and type II (II-A and II-C) but not other CRISPR systems. Here, we report the discovery of 12 genes, including inhibitors of type V-A and I-C CRISPR systems. AcrVA1 inhibits a broad spectrum of Cas12a (Cpf1) orthologs-including MbCas12a, Mb3Cas12a, AsCas12a, and LbCas12a-when assayed in human cells. The genes reported here provide useful biotechnological tools and mark the discovery of loci in many bacteria and phages.
ISSN:0036-8075
1095-9203