A phage-encoded anti-CRISPR enables complete evasion of type VI-A CRISPR-Cas immunity.
A phage-encoded anti-CRISPR enables complete evasion of type VI-A CRISPR-Cas immunity.
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DOI:
10.1126/science.abb6151
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发表时间:
2020-07-03
期刊:
影响因子:
--
通讯作者:
Marraffini LA
中科院分区:
文献类型:
--
作者:
Meeske AJ;Jia N;Cassel AK;Kozlova A;Liao J;Wiedmann M;Patel DJ;Marraffini LA
The crRNA-guided nuclease Cas13 recognizes complementary viral transcripts to trigger the degradation of both host and viral RNA during the type VI CRISPR-Cas antiviral response. How viruses can counteract this immunity is not known. We describe a listeriophage (ϕLS46) encoding an anti-CRISPR protein (AcrVIA1) that inactivated the type VI-A CRISPR system of Listeria seeligeri. Using genetics, biochemistry and structural biology we found that AcrVIA1 interacted with the guide-exposed face of Cas13a, preventing access to the target RNA and the conformational changes required for nuclease activation. Unlike inhibitors of DNA-cleaving Cas nucleases, which cause limited immunosuppression and require multiple infections to bypass CRISPR defenses, a single dose of AcrVIA1 delivered by an individual virion could completely dismantle type VI-A CRISPR-mediated immunity.
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影响因子:
64.8
作者:
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通讯作者:
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DOI:
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发表时间:
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期刊:
Science (New York, N.Y.)
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期刊:
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作者:
Meeske AJ;Marraffini LA
通讯作者:
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