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Directed evolution of single-chain Fv for cytoplasmic expression using the β-galactosidase complementation assay results in proteins highly susceptible to protease degradation and aggregation

机译:使用β-半乳糖苷酶互补检测法指导单链Fv进化为胞质表达可导致高度易受蛋白酶降解和聚集的蛋白质

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摘要

BackgroundAntibody fragments are molecules widely used for diagnosis and therapy. A large amount of protein is frequently required for such applications. New approaches using folding reporter enzymes have recently been proposed to increase soluble expression of foreign proteins in Escherichia coli. To date, these methods have only been used to screen for proteins with better folding properties but have never been used to select from a large library of mutants. In this paper we apply one of these methods to select mutations that increase the soluble expression of two antibody fragments in the cytoplasm of E. coli.
机译:背景技术抗体片段是广泛用于诊断和治疗的分子。这种应用经常需要大量的蛋白质。最近已经提出了使用折叠报道酶的新方法来增加外源蛋白在大肠杆菌中的可溶性表达。迄今为止,这些方法仅用于筛选具有更好折叠特性的蛋白质,而从未用于从大型突变体文库中进行选择。在本文中,我们应用这些方法之一来选择能增加两个抗体片段在大肠杆菌细胞质中的可溶性表达的突变。

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