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Targeted mutations in Val101 and Arg27 interferon beta protein increase its transcriptional and translational activities

机译:Val101和Arg27干扰素β蛋白的靶向突变可增加其转录和翻译活性

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Interferon beta (IFN beta) is the most prescribed drug that has been used frequently for the treatment of multiple sclerosis (MS) patients. The aim of this study is to improve the production of IFN beta by induction of site directed mutagenesis. Accordingly, recombinant constructs were designed in order to enhance the expression of IFN beta mRNA and protein. The recombinant plasmids were transfected to the CHO cell line, following RNA extractions and cDNA synthesis. The effects of recombinant constructs were analyzed by real time PCR, ELISA and MTT assay. Transfected samples with either IFN beta(101) or IFN beta(101+27) have shown 11.55 and 2.26 fold elevation and over-expression compare to the wild type construct respectively. Our data also indicated that the IFN beta(101) and IFN beta(101+27) constructs increase IFN beta protein expression more than 2.2 and 4.5 fold, respectively compared to the control group. It could be concluded that the substitution of Phe in the codon 101 position, which may increase the binding activity of IFN beta with its receptors and introduction of an additional N glycosylation site (Asn-X-Thr) in the position 27 of IFN beta protein may cause such an effect. The proliferative activity of transfected cells by a recombinant IFN beta(101) decreases in comparison to the wild type, although it was not statistically significant. Over-expression of IFN beta in such a level is promising not only for the patients but also for the pharmaceutical industries. (C) 2015 Elsevier Ltd. All rights reserved.
机译:干扰素beta(IFN beta)是处方最明确的药物,经常用于治疗多发性硬化症(MS)患者。这项研究的目的是通过诱导定点诱变来提高IFNβ的产生。因此,设计重组构建体以增强IFNβmRNA和蛋白质的表达。 RNA提取和cDNA合成后,将重组质粒转染到CHO细胞系中。重组构建物的作用通过实时PCR,ELISA和MTT分析进行分析。与野生型构建体相比,具有IFN beta(101)或IFN beta(101 + 27)的转染样品分别显示出11.55和2.26倍的升高和过表达。我们的数据还表明,与对照组相比,IFN beta(101)和IFN beta(101 + 27)构建体将IFN beta蛋白表达分别提高了2.2倍和4.5倍以上。可以得出结论,密码子101位置的Phe取代可能会增加IFNβ及其受体的结合活性,并在IFNβ蛋白的27位引入一个额外的N糖基化位点(Asn-X-Thr)可能会导致这种效果。与野生型相比,重组IFN beta(101)转染的细胞的增殖活性降低,尽管在统计学上不显着。如此水平的IFNβ的过表达不仅对于患者而且对于制药业都是有希望的。 (C)2015 Elsevier Ltd.保留所有权利。

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