Sequence- and structure-specific RNA processing by a CRISPR endonuclease.

Sequence- and structure-specific RNA processing by a CRISPR endonuclease.
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DOI:
10.1126/science.1192272
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发表时间:
2010-09-10
期刊:
Science (New York, N.Y.)
影响因子:
--
通讯作者:
Doudna JA
Doudna JA
中科院分区:
其他
文献类型:
--
作者:
Haurwitz RE;Jinek M;Wiedenheft B;Zhou K;Doudna JA

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许多原核生物含有基因组成簇的规则间隔的短回文重复序列(CRISPR),其赋予对侵入性遗传元件的抗性。该免疫系统的核心是在CRISPR基因座转录后产生CRISPR衍生的RNA(crRNA)。在这里,我们确定了负责铜绿假单胞菌中前crRNA加工的核糖核酸内切酶(Csy4)。Csy 4与其同源RNA复合的1.8 Å晶体结构揭示了一种意想不到的识别机制,其中Csy 4在CRISPR重复茎环的大沟中进行序列特异性相互作用。与磷酸骨架的静电接触一起,这些使得Csy4能够选择性地结合和切割前体crRNA。Csy4的活性位点包含两个不变残基,丝氨酸和组氨酸。这里确定的RNA识别机制解释了CRISPR特异性内切核糖核酸酶大家族的序列和结构特异性加工。
Many prokaryotes contain genomic clustered regularly interspaced short palindromic repeats (CRISPRs) that confer resistance to invasive genetic elements. Central to this immune system is the production of CRISPR-derived RNAs (crRNAs) following transcription of the CRISPR locus. Here we identify the endoribonuclease (Csy4) responsible for pre-crRNA processing in Pseudomonas aeruginosa. A 1.8 Å crystal structure of Csy4 in complex with its cognate RNA reveals an unexpected recognition mechanism whereby Csy4 makes sequence-specific interactions in the major groove of the CRISPR repeat stem-loop. Together with electrostatic contacts to the phosphate backbone, these enable Csy4 to selectively bind and cleave pre-crRNAs. The active site of Csy4 comprises two invariant residues, a serine and a histidine. The RNA recognition mechanism identified here explains sequence- and structure-specific processing by a large family of CRISPR-specific endoribonucleases.
DOI: 10.1038/nrg2749
发表时间: 2010-03
期刊: Nature reviews. Genetics
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