首页> 外文期刊>Acta crystallographica, Section F. Structural biology and crystallization communications >Preliminary crystallographic analysis of recombinant VapBC-15 toxin-antitoxin complex from Mycobacterium tuberculosis
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Preliminary crystallographic analysis of recombinant VapBC-15 toxin-antitoxin complex from Mycobacterium tuberculosis

机译:结核分枝杆菌重组VapBC-15毒素-抗毒素复合物的初步晶体学分析

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The Mycobacterium tuberculosis vapBC15 locus encodes a toxin-antitoxin complex. VapC-15 is a toxin and possesses ribonuclease activity and VapB-15 is an antitoxin which both binds and inhibits the VapC-15 toxin. In this study, vapBC15 genes were cloned and co-expressed in Escherichia coli. The complex was purified to homogeneity by affinity and size-exclusion chromatography. The VapBC-15 complex was crystallized using the sitting-drop vapour-diffusion technique. The crystals diffracted to 2.6 angstrom resolution and belonged to space group P2(1)2(1)2(1), with unit-cell parameters a = 85.63, b = 139.09, c = 148.86 angstrom. The self-rotation function combined with Matthews coefficient and solvent-content calculations suggests the presence of either six or eight molecules of the complex in the asymmetric unit.
机译:结核分枝杆菌vapBC15基因座编码毒素-抗毒素复合物。 VapC-15是一种毒素,具有核糖核酸酶活性,而VapB-15是一种既能结合又能抑制VapC-15毒素的抗毒素。在这项研究中,vapBC15基因被克隆并在大肠杆菌中共表达。通过亲和力和尺寸排阻色谱法将复合物纯化至均质。 VapBC-15复合物使用坐滴式蒸汽扩散技术结晶。晶体衍射到2.6埃分辨率,属于空间群P2(1)2(1)2(1),单位晶胞参数a = 85.63,b = 139.09,c = 148.86埃。自旋转函数与马修斯系数和溶剂含量计算相结合,表明在不对称单元中存在六或八个分子的配合物。

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