Mechanisms for target recognition and cleavage by the Cas12i RNA-guided endonuclease.
Mechanisms for target recognition and cleavage by the Cas12i RNA-guided endonuclease.
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DOI:
10.1038/s41594-020-0499-0
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发表时间:
2020-11
影响因子:
16.8
通讯作者:
Chang L
中科院分区:
文献类型:
--
作者:
Zhang H;Li Z;Xiao R;Chang L
Cas12i is a recently identified type V CRISPR-Cas endonuclease that predominantly cleaves the non-target strand of a double stranded DNA substrate. The nicking activity of Cas12i can be potentially used for genome editing with high specificity. To elucidate its mechanisms for target recognition and cleavage, we determined the structures of Cas12i in multiple functional states by cryo-EM. Cas12i pre-orders a 7-nucleotide seed sequence of the crRNA for target recognition and undergoes a two-step activation by crRNA-DNA hybridization. Formation of 14 base pairs activates the nickase activity, and 28-bp hybridization promotes cleavage of the target strand. The atomic structures and mechanistic insights would facilitate the manipulation of Cas12i for genome editing applications.
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