Structural basis of PAM-dependent target DNA recognition by the Cas9 endonuclease.

Structural basis of PAM-dependent target DNA recognition by the Cas9 endonuclease.
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DOI:
10.1038/nature13579
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发表时间:
2014-09-25
期刊:
影响因子:
64.8
通讯作者:
Jinek, Martin
Jinek, Martin
中科院分区:
综合性期刊1区
文献类型:
--
作者:
Anders, Carolin;Niewoehner, Ole;Duerst, Alessia;Jinek, Martin

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crispr相关蛋白Cas9是一种RNA引导的内切酶,可切割与引导RNA中20个核苷酸片段互补的双链dna序列。Cas9已成为基因组编辑和基因表达控制的多功能分子工具。rna引导的DNA识别和切割严格要求靶DNA中存在原间隔邻近基序(PAM)。在这里,我们报道了化脓性链球菌Cas9与单分子引导RNA (sgRNA)和含有规范5 ' -NGG-3 ' PAM的靶DNA络合的晶体结构。该结构揭示了PAM基序位于碱基配对的DNA双链中。非互补链GG二核苷酸通过与Cas9 c端结构域的保守精氨酸残基的主要槽相互作用被读出。与PAM双链的小凹槽和目标DNA链上+1位置的磷酸二酯基团的相互作用有助于PAM上游的目标DNA双链的局部链分离。这些观察结果提示pam依赖的靶DNA融化和RNA-DNA杂交形成的机制。此外,本研究还为具有新型PAM特异性的Cas9酶的合理工程构建了框架。
The CRISPR-associated protein Cas9 is an RNA-guided endonuclease that cleaves double-stranded DNAs bearing sequences complementary to a 20-nucleotide segment in the guide RNA. Cas9 has emerged as a versatile molecular tool for genome editing and gene expression control. RNA-guided DNA recognition and cleavage strictly require the presence of a protospacer adjacent motif (PAM) in the target DNA. Here, we report a crystal structure of Streptococcus pyogenes Cas9 complexed with a single-molecule guide RNA (sgRNA) and a target DNA containing a canonical 5′-NGG-3′ PAM. The structure reveals that the PAM motif resides in a base-paired DNA duplex. The non-complementary strand GG dinucleotide is read out via major groove interactions with conserved arginine residues from the C-terminal domain of Cas9. Interactions with the minor groove of the PAM duplex and the phosphodiester group at the +1 position in the target DNA strand contribute to local strand separation of the target DNA duplex immediately upstream of the PAM. These observations suggest a mechanism for PAM-dependent target DNA melting and RNA-DNA hybrid formation. Furthermore, this study establishes a framework for the rational engineering of Cas9 enzymes with novel PAM specificities.
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