期刊
SCIENCE
卷 353, 期 6299, 页码 -出版社
AMER ASSOC ADVANCEMENT SCIENCE
DOI: 10.1126/science.aaf5573
关键词
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资金
- Paul and Daisy Soros Fellowship
- Friends of the McGovern Institute Fellowship
- Poitras Center for Affective Disorders
- U.S. Department of Energy (DOE)
- graduate program of Skoltech Data-Intensive Biomedicine and Biotechnology Center for Research, Education, and Innovation
- Simons Center for the Social Brain
- National Institute of General Medical Sciences [T32GM007753]
- U.S. Department of Health and Human Services
- NIH [GM10407]
- Russian Science Foundation [14-14-00988]
- Skoltech
- NIH through the National Institute of Mental Health [5DP1-MH100706, 1R01-MH110049]
- NSF
- New York Stem Cell Foundation
- Simons, Paul G. Allen Family Foundation
- Vallee Foundation
- Russian Science Foundation [14-14-00988] Funding Source: Russian Science Foundation
The clustered regularly interspaced short palindromic repeat (CRISPR)-CRISPR-associated genes (Cas) adaptive immune system defends microbes against foreign genetic elements via DNA or RNA-DNA interference. We characterize the class 2 type VI CRISPR-Cas effector C2c2 and demonstrate its RNA-guided ribonuclease function. C2c2 from the bacterium Leptotrichia shahii provides interference against RNA phage. In vitro biochemical analysis shows that C2c2 is guided by a single CRISPR RNA and can be programmed to cleave single-stranded RNA targets carrying complementary protospacers. In bacteria, C2c2 can be programmed to knock down specific mRNAs. Cleavage is mediated by catalytic residues in the two conserved Higher Eukaryotes and Prokaryotes Nucleotide-binding (HEPN) domains, mutations of which generate catalytically inactive RNA-binding proteins. These results broaden our understanding of CRISPR-Cas systems and suggest that C2c2 can be used to develop new RNA-targeting tools.
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