期刊
SCIENCE
卷 378, 期 6622, 页码 882-+出版社
AMER ASSOC ADVANCEMENT SCIENCE
DOI: 10.1126/science.add7347
关键词
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资金
- Japan Society for the Promotion of Science (JSPS) (KAKENHI grant) [21H05736]
- National Institutes of Health's (NIH's) Intramural Research Program (National Library of Medicine)
- Platform Project for Supporting Drug Discovery and Life Science Research Basis for Supporting Innovative Drug Discovery and Life Science Research (BINDS) from the Japanese Agency for for Medical Research and Development (AMED) [JP21am0101115, 2792, JP21wm0325048h0001]
- JSPS (KAKENHI grants) [20K20579, 21H05281]
- Takeda Medical Research Foundation
- Inamori Research Institute for Science
- NIH [1R21-AI149694, R01-EB031957, R56-HG011857]
- McGovern Institute Neurotechnology (MINT) program
- G. Harold & Leila Y. Mathers Charitable Foundation
- K. Lisa Yang and Hock E. Tan Center for Molecular Therapeutics in Neuroscience
- MIT John W. Jarve (1978) Seed Fund for Science Innovation, FastGrants
- Cystic Fibrosis Foundation
- Google Ventures
- Norn Group
- NHGRI/TDCC Opportunity Fund
- McGovern Institute
The type III-E CRISPR-Cas7-11 effector can catalyze crRNA-guided RNA cleavage by binding crRNA and Csx29, and the binding of tgRNA induces conformational changes in Csx29. Csx29 cleaves Csx30 through a tgRNA-dependent pathway, resulting in the generation of toxic protein fragments and growth arrest, which is regulated by Csx31. Csx30 modulates the cellular response to infection by binding Csx31 and the associated sigma factor RpoE. Additionally, the Cas7-11-Csx29-Csx30 system has been engineered for programmable RNA sensing in mammalian cells.
The type III-E CRISPR-Cas7-11 effector binds a CRISPR RNA (crRNA) and the putative protease Csx29 and catalyzes crRNA-guided RNA cleavage. We report cryo-electron microscopy structures of the Cas7-11-crRNA-Csx29 complex with and without target RNA (tgRNA), and demonstrate that tgRNA binding induces conformational changes in Csx29. Biochemical experiments revealed tgRNA-dependent cleavage of the accessory protein Csx30 by Csx29. Reconstitution of the system in bacteria showed that Csx30 cleavage yields toxic protein fragments that cause growth arrest, which is regulated by Csx31. Csx30 binds Csx31 and the associated sigma factor RpoE (RNA polymerase, extracytoplasmic E), suggesting that Csx30-mediated RpoE inhibition modulates the cellular response to infection. We engineered the Cas7-11-Csx29-Csx30 system for programmable RNA sensing in mammalian cells. Overall, the Cas7-11-Csx29 effector is an RNA-dependent nuclease-protease.
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