RNA-activated protein cleavage with a CRISPR-associated endopeptidase.

RNA-activated protein cleavage with a CRISPR-associated endopeptidase.
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DOI:
10.1126/science.add7450
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发表时间:
2022-11-25
期刊:
Science (New York, N.Y.)
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其他
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CRISPR-Cas系统通过rna引导的核酸酶活性在原核生物中提供针对外源遗传元件的适应性免疫反应。最近,在与CRISPR系统的遗传关联中发现了其他具有非核酸酶功能的基因,这表明可能存在其他rna引导的非溶核酶。其中一个这样的基因编码TPR-CHAT蛋白酶Csx29,它与CRISPR效应物Cas7-11相关。在这里,我们证明了这种crispr相关蛋白酶(CASP)表现出可编程rna激活的内多肽酶活性,可以对抗sigma因子抑制剂来调节转录反应。活性和底物结合的CASP复合物的低温电子显微镜显示了一种变构活化机制,该机制在靶RNA结合时重组Csx29催化残基。这项工作揭示了自然界中RNA引导的功能,可以用于体外和人类细胞中的RNA传感应用。
CRISPR-Cas systems provide adaptive immune responses in prokaryotes against foreign genetic elements through RNA-guided nuclease activity. Recently, additional genes with non-nuclease functions have been found in genetic association with CRISPR systems, suggesting there may be other RNA-guided non-nucleolytic enzymes. One such gene encodes the TPR-CHAT protease Csx29, which is associated with the CRISPR effector Cas7–11. Here, we demonstrate that this CRISPR-associated protease (CASP) exhibits programmable RNA-activated endopeptidase activity against a sigma factor inhibitor to regulate a transcriptional response. Cryo–electron microscopy of an active and substrate-bound CASP complex reveals an allosteric activation mechanism that reorganizes Csx29 catalytic residues upon target RNA binding. This work reveals an RNA-guided function in nature which can be leveraged for RNA sensing applications in vitro and in human cells.
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