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:
Science (New York, N.Y.)
影响因子:
--
通讯作者:
Marraffini LA
Marraffini LA
中科院分区:
其他
文献类型:
--
作者:
Meeske AJ;Jia N;Cassel AK;Kozlova A;Liao J;Wiedmann M;Patel DJ;Marraffini LA

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crRNA引导的核酸酶Cas 13识别互补的病毒转录物,以在VI型CRISPR-Cas抗病毒应答期间触发宿主和病毒RNA的降解。病毒如何抵消这种免疫力尚不清楚。我们描述了一种编码抗CRISPR蛋白(AcrVIA 1)的噬菌体(AcrLS 46),该蛋白可使李斯特菌的VI-A型CRISPR系统失活。利用遗传学,生物化学和结构生物学,我们发现AcrVIA 1与Cas 13 a的导向暴露面相互作用,阻止了靶RNA的进入和核酸酶激活所需的构象变化。与DNA切割Cas核酸酶的抑制剂不同,其导致有限的免疫抑制并需要多次感染才能绕过CRISPR防御,由单个病毒体递送的单剂量AcrVIA 1可以完全拆除VI-A型CRISPR介导的免疫力。
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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