首页> 外文期刊>Acta crystallographica, Section F. Structural biology and crystallization communications >Crystallization and preliminary X-ray diffraction analysis of the Cmr2-Cmr3 subcomplex in the CRISPR-Cas RNA-silencing effector complex
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Crystallization and preliminary X-ray diffraction analysis of the Cmr2-Cmr3 subcomplex in the CRISPR-Cas RNA-silencing effector complex

机译:CRISPR-Cas RNA沉默效应复合物中Cmr2-Cmr3亚复合物的结晶和初步X射线衍射分析

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摘要

Clustered, regularly interspaced, short palindromic repeat (CRISPR) loci, found in prokaryotes, are transcribed to produce CRISPR RNAs (crRNAs). The Cmr proteins (Cmr1-6) and crRNA form a ribonucleoprotein complex that degrades target RNAs derived from invading genetic elements. Cmr2dHD, a Cmr2 variant lacking the N-terminal putative HD nuclease domain, and Cmr3 were co-expressed in Escherichia coli cells and co-purified as a complex. The Cmr2dHD-Cmr3 complex was co-crystallized with 3'-AMP by the vapour-diffusion method. The crystals diffracted to 2.6 angstrom resolution using synchrotron radiation at the Photon Factory. The crystals belonged to the orthorhombic space group I222, with unit-cell parameters a = 103.9, b = 136.7, c = 192.0 angstrom. The asymmetric unit of the crystals is expected to contain one Cmr2dHD-Cmr3 complex with a Matthews coefficient of 3.0 angstrom (3) Da(-1) and a solvent content of 59%.
机译:在原核生物中发现的簇状,规则间隔,短回文重复(CRISPR)基因座被转录产生CRISPR RNA(crRNA)。 Cmr蛋白(Cmr1-6)和crRNA形成核糖核蛋白复合物,该复合物降解源自入侵遗传元件的靶RNA。 Cmr2dHD(一种缺少N端假定的HD核酸酶结构域的Cmr2变体)和Cmr3在大肠杆菌细胞中共表达,并作为复合物共纯化。通过蒸气扩散法将Cmr2dHD-Cmr3复合物与3'-AMP共结晶。晶体在光子工厂使用同步加速器辐射衍射至2.6埃分辨率。晶体属于正交晶体空间群I222,其晶胞参数a = 103.9,b = 136.7,c = 192.0埃。晶体的不对称单元有望包含一种Cmr2dHD-Cmr3复合物,其马修斯系数为3.0埃(3)Da(-1),溶剂含量为59%。

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