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Effects of IMAC Specific Peptide Tags on the Stability of Recombinant Green Fluorescent Protein

机译:IMAC特异性肽标签对重组绿色荧光蛋白稳定性的影响

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Immobilized metal ion affinity chromatography (IMAC) using peptide affinity tags has become a popular tool for protein purification. An important feature dictating the use of a specific affinity tag is whether its structure influences the properties of the target protein to which it is attached. In this work we have studied the influence on protein stability of two novel peptide affinity tags, namely NT1A and HIT2, and compared their effect to the commonly used hexa-histidine tag, all attached to the C-terminus of a enhanced green fluorescent protein (eGFP). A comparison of the influence of C- or N-terminal orientation of the tags was also carried out by studying the NT1A tag attached at either terminus of the eGFP. Protein stability was studied utilising guanidine hydrochloride equilibrium unfolding procedures and CD and fluorescence spectroscopy. The novel peptide affinity tags, NT1A and HIT2, and the His6 tag were found to not affect the stability of eGFP. Although these results are protein specific, they highlight, nevertheless, the need to employ suitable characterisation tools if the impact of a specific peptide tag on the folded status or stability of a recombinant tagged protein, purified by immobilized metal ion affinity chromatographic methods, are to be rigorously evaluated and the appropriate choice of peptide tag made.
机译:使用肽亲和标签的固定金属离子亲和色谱(IMAC)已成为蛋白质纯化的流行工具。决定使用特定亲和标签的一个重要特征是其结构是否会影响其所附着的靶蛋白的特性。在这项工作中,我们研究了两个新型肽亲和标签对蛋白质稳定性的影响,即NT1A和HIT2,并将它们与常用的六组氨酸标签进行了比较,这些标签都附着在增强的绿色荧光蛋白的C末端( eGFP)。还通过研究附着在eGFP任一末端的NT1A标签,对标签的C端或N端方向的影响进行了比较。利用盐酸胍平衡展开程序以及CD和荧光光谱研究了蛋白质稳定性。发现新型肽亲和标签NT1A和HIT2以及His6标签不会影响eGFP的稳定性。尽管这些结果是蛋白质特异性的,但它们强调,如果特定肽标签对固定化金属离子亲和色谱法纯化的重组标签蛋白的折叠状态或稳定性的影响要使用合适的表征工具,进行严格评估并适当选择肽标签。

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