Cas6 specificity and CRISPR RNA loading in a complex CRISPR-Cas system.

Cas6 specificity and CRISPR RNA loading in a complex CRISPR-Cas system.
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DOI:
10.1093/nar/gku308
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发表时间:
2014-06
影响因子:
14.9
通讯作者:
White MF
White MF
中科院分区:
生物学2区
文献类型:
--
作者:
Sokolowski RD;Graham S;White MF

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CRISPR-Cas是一种适应性原核免疫系统,提供针对病毒和其他移动的遗传元件的保护。在I型和III型CRISPR-Cas系统中,CRISPR RNA(crRNA)通过Cas 6内切核酸酶切割初级转录物产生,并加载到多亚基监视/效应子复合物中,允许同源定向检测和切割入侵元件。高度研究的CRISPR-Cas系统,如大肠杆菌和铜绿假单胞菌中的那些,具有单个Cas 6酶,其是监视复合物的组成亚基。相比之下,硫磺硫化叶菌具有复杂的CRISPR-Cas系统,包括三种类型的监测复合物(Cascade/type I-A,CSM/type III-A和CMR/type III-B),五种Cas 6旁系同源物和两种不同的CRISPR重复家族(AB和CD)。在这里,我们研究了来自S.太阳神Cas 6 -1亚型对CD家族CRISPR重复序列具有特异性,通过多重转换催化产生crRNA,而Cas 6 -3具有更广泛的特异性,并且还加工具有CRISPR重复序列相关序列的非编码RNA。监测复合物中crRNA的深度测序揭示了源自AB和CD基因座的间隔区的偏倚分布,表明Cas 6旁系同源物与其下游效应复合物之间的功能偶联。
CRISPR-Cas is an adaptive prokaryotic immune system, providing protection against viruses and other mobile genetic elements. In type I and type III CRISPR-Cas systems, CRISPR RNA (crRNA) is generated by cleavage of a primary transcript by the Cas6 endonuclease and loaded into multisubunit surveillance/effector complexes, allowing homology-directed detection and cleavage of invading elements. Highly studied CRISPR-Cas systems such as those in Escherichia coli and Pseudomonas aeruginosa have a single Cas6 enzyme that is an integral subunit of the surveillance complex. By contrast, Sulfolobus solfataricus has a complex CRISPR-Cas system with three types of surveillance complexes (Cascade/type I-A, CSM/type III-A and CMR/type III-B), five Cas6 paralogues and two different CRISPR-repeat families (AB and CD). Here, we investigate the kinetic properties of two different Cas6 paralogues from S. solfataricus. The Cas6-1 subtype is specific for CD-family CRISPR repeats, generating crRNA by multiple turnover catalysis whilst Cas6-3 has a broader specificity and also processes a non-coding RNA with a CRISPR repeat-related sequence. Deep sequencing of crRNA in surveillance complexes reveals a biased distribution of spacers derived from AB and CD loci, suggesting functional coupling between Cas6 paralogues and their downstream effector complexes.
DOI: 10.1016/j.molcel.2011.10.023
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期刊: MOLECULAR CELL
影响因子: 16
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发表时间: 2008-12-19
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影响因子: --
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发表时间: 2014-01
影响因子: 14.9
作者:
Niewoehner O;Jinek M;Doudna JA
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发表时间: 2013-10-10
期刊: Molecular cell
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作者:
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通讯作者: Stagg S