Optimized E. coli expression strain LOBSTR eliminates common contaminants from His-tag purification.

Optimized E. coli expression strain LOBSTR eliminates common contaminants from His-tag purification.
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DOI:
10.1002/prot.24364
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发表时间:
2013-11
影响因子:
2.9
通讯作者:
Schwartz, Thomas U.
Schwartz, Thomas U.
中科院分区:
生物学4区
文献类型:
--
作者:
Andersen, Kasper R.;Leksa, Nina C.;Schwartz, Thomas U.

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his标签亲和纯化是纯化大肠杆菌中表达的重组蛋白最常用的方法之一。使用his标签的一个缺点是污染组氨酸丰富的大肠杆菌蛋白的共同纯化。我们设计了一种新的大肠杆菌表达菌株,LOBSTR(低背景菌株),它消除了最丰富的污染物。LOBSTR源自大肠杆菌BL21(DE3)菌株,携带arnA和sld的基因组修饰拷贝,其蛋白产物对Ni和Co树脂的亲和力降低,从而使目标蛋白的纯度更高。使用LOBSTR可以通过减少背景污染来追求具有挑战性的低表达蛋白目标,而无需额外的纯化步骤,材料或成本,从而推动了标准his标签纯化的极限。
His-tag affinity purification is one of the most commonly used methods to purify recombinant proteins expressed in E. coli. One drawback of using the His-tag is the co-purification of contaminating histidine-rich E. coli proteins. We engineered a new E. coli expression strain, LOBSTR (low background strain), which eliminates the most abundant contaminants. LOBSTR is derived from the E. coli BL21(DE3) strain and carries genomically modified copies of arnA and slyD, whose protein products exhibit reduced affinities to Ni and Co resins, resulting in a much higher purity of the target protein. The use of LOBSTR enables the pursuit of challenging low-expressing protein targets by reducing background contamination with no additional purification steps, materials, or costs, and thus pushes the limits of standard His-tag purifications.
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