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
中科院分区:
文献类型:
--
作者:
Anders, Carolin;Niewoehner, Ole;Duerst, Alessia;Jinek, Martin
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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