Lack of Cas13a inhibition by anti-CRISPR proteins from Leptotrichia prophages.

Lack of Cas13a inhibition by anti-CRISPR proteins from Leptotrichia prophages.
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DOI:
10.1016/j.molcel.2022.05.002
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发表时间:
2022-06-02
期刊:
影响因子:
16
通讯作者:
Bondy-Denomy, Joseph
Bondy-Denomy, Joseph
中科院分区:
生物学1区
文献类型:
--
作者:
Johnson, Matthew C.;Hille, Logan T.;Kleinstiver, Benjamin P.;Meeske, Alexander J.;Bondy-Denomy, Joseph

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CRISPR系统是原核适应性免疫系统,其使用RNA引导的Cas核酸酶来识别和破坏外源遗传元件。为了克服CRISPR免疫,噬菌体已经进化出不同家族的抗CRISPR蛋白(Acr)。最近,描述了抑制VI-A型CRISPR系统的7个Acr家族(AcrVIA 1 -7)的发现和表征。我们详细介绍了几个不一致的问题,在研究中报告的结果。这些包括不准确的生物信息学分析,以及不可能构建的细菌菌株。作者提供了已发表的菌株,但MS 2噬菌体空斑试验不支持已发表的结果。我们还独立地测试了原始报告中描述的Acr序列,在E. coli和哺乳动物细胞,但没有观察到抗Cas 13 a活性。综上所述,我们的数据和分析促使我们质疑Lin等人报道的AcrVIA 1 -7是VI型抗CRISPR蛋白的说法。约翰逊等人独立测定了7种VI-A型抗CRISPR(Acr)的活性,但未发现抑制作用。作者详细描述了与Lin等人构建的菌株的不一致之处。作者不相信这些蛋白质是真实的Acr。
CRISPR systems are prokaryotic adaptive immune systems that use RNA-guided Cas nucleases to recognize and destroy foreign genetic elements. To overcome CRISPR immunity, bacteriophages have evolved diverse families of anti-CRISPR proteins (Acrs). Recently, described the discovery and characterization of 7 Acr families (AcrVIA1–7) that inhibit type VI-A CRISPR systems. We detail several inconsistencies that question the results reported in the study. These include inaccurate bioinformatics analyses, and bacterial strains that are impossible to construct. Published strains were provided by the authors, but MS2 bacteriophage plaque assays did not support the published results. We also independently tested the Acr sequences described in the original report, in E. coli and mammalian cells, but did not observe anti-Cas13a activity. Taken together, our data and analyses prompt us to question the claim that AcrVIA1–7 reported in Lin et al. are type VI anti-CRISPR proteins. Johnson et al. independently assayed the activity of 7 Type VI-A anti-CRISPRs (Acrs) published by but found no inhibition. The authors detail inconsistencies with the strains constructed by Lin et al. The authors do not believe these proteins are real Acrs.
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