National Institutes of Health/National Center for Advancing Translational Sciences (NIH/NCATS)
U01AI142817-02
米国
引用
ジャーナル: Nat Struct Mol Biol / 年: 2021 タイトル: DNA interference states of the hypercompact CRISPR-CasΦ effector. 著者: Patrick Pausch / Katarzyna M Soczek / Dominik A Herbst / Connor A Tsuchida / Basem Al-Shayeb / Jillian F Banfield / Eva Nogales / Jennifer A Doudna / 要旨: CRISPR-CasΦ, a small RNA-guided enzyme found uniquely in bacteriophages, achieves programmable DNA cutting as well as genome editing. To investigate how the hypercompact enzyme recognizes and ...CRISPR-CasΦ, a small RNA-guided enzyme found uniquely in bacteriophages, achieves programmable DNA cutting as well as genome editing. To investigate how the hypercompact enzyme recognizes and cleaves double-stranded DNA, we determined cryo-EM structures of CasΦ (Cas12j) in pre- and post-DNA-binding states. The structures reveal a streamlined protein architecture that tightly encircles the CRISPR RNA and DNA target to capture, unwind and cleave DNA. Comparison of the pre- and post-DNA-binding states reveals how the protein rearranges for DNA cleavage upon target recognition. On the basis of these structures, we created and tested mutant forms of CasΦ that cut DNA up to 20-fold faster relative to wild type, showing how this system may be naturally attenuated to improve the fidelity of DNA interference. The structural and mechanistic insights into how CasΦ binds and cleaves DNA should allow for protein engineering for both in vitro diagnostics and genome editing.
分子量: 24.305 Da / 分子数: 2 / 由来タイプ: 合成 / 式: Mg / タイプ: SUBJECT OF INVESTIGATION
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詳細
研究の焦点であるリガンドがあるか
Y
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実験情報
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実験
実験
手法: 電子顕微鏡法
EM実験
試料の集合状態: PARTICLE / 3次元再構成法: 単粒子再構成法
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試料調製
構成要素
名称: Cryo-EM map of CasPhi bound to crRNA and phosphorothioate-DNA in the presence of the nuclease magnesium cofactor タイプ: COMPLEX / Entity ID: #1-#4 / 由来: MULTIPLE SOURCES