期刊
MOLECULAR CELL
卷 74, 期 1, 页码 132-+出版社
CELL PRESS
DOI: 10.1016/j.molcel.2019.02.001
关键词
-
资金
- Amgen
- NIH [P30GM110732, R01GM110270, R01GM108888, R21 AI130670, DP2EB020402, S10OD021634]
- National Science Foundation EPSCoR [EPS-110134]
- M.J. Murdock Charitable Trust
- Montana State University Agricultural Experimental Station (USDA NIFA)
Bacteria and archaea have evolved sophisticated adaptive immune systems that rely on CRISPR RNA (crRNA)-guided detection and nuclease-mediated elimination of invading nucleic acids. Here, we present the cryo-electron microscopy (cryo-EM) structure of the type I-F crRNA-guided surveillance complex (Csy complex) from Pseudomonas aeruginosa bound to a double-stranded DNA target. Comparison of this structure to previously determined structures of this complex reveals a similar to 180-degree rotation of the C-terminal helical bundle on the large Cas8f subunit. We show that the double-stranded DNA (dsDNA)-induced conformational change in Cas8f exposes a Cas2/3 nuclease recruitment helix that is structurally homologous to a virally encoded anti-CRISPR protein (AcrIF3). Structural homology between Cas8f and AcrIF3 suggests that AcrIF3 is a mimic of the Cas8f nuclease recruitment helix.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据