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
中科院分区:
文献类型:
--
作者:
Johnson, Matthew C.;Hille, Logan T.;Kleinstiver, Benjamin P.;Meeske, Alexander J.;Bondy-Denomy, Joseph
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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DOI:
10.1126/science.aaf5573
发表时间:
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DOI:
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期刊:
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