Label-free electrochemical diagnosis of viral antigens with genetically engineered fusion protein.

Label-free electrochemical diagnosis of viral antigens with genetically engineered fusion protein.
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DOI:
10.3390/s120810097
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发表时间:
2012
期刊:
Sensors (Basel, Switzerland)
影响因子:
--
通讯作者:
Park TJ
Park TJ
中科院分区:
其他
文献类型:
--
作者:
Heo NS;Zheng S;Yang M;Lee SJ;Lee SY;Kim HJ;Park JY;Lee CS;Park TJ

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我们开发了一种简单的电化学生物传感策略,用于在金电极表面无标记诊断乙肝病毒(乙肝病毒)。将金结合多肽(GBP)与抗乙肝表面抗原(HBs)单链抗体(ScFv)以基因工程蛋白的形式融合。该GBP-ScFv融合蛋白可直接结合到金基质上,GBP与金表面具有较强的结合亲和力,同时识别位点朝向样品进行靶向结合。此外,这种一步固定化策略大大简化了制备过程,无需任何化学修饰,并保持了生物识别元件的活性。该体系实现了蛋白质的特异性固定和靶标的灵敏检测,并被表面等离子体共振分析所证实,并成功地应用于高达0.14 ng/mLHBs的电化学循环伏安和阻抗谱。
We have developed a simple electrochemical biosensing strategy for the label-free diagnosis of hepatitis B virus (HBV) on a gold electrode surface. Gold-binding polypeptide (GBP) fused with single-chain antibody (ScFv) against HBV surface antigen (HBsAg), in forms of genetically engineered protein, was utilized. This GBP-ScFv fusion protein can directly bind onto the gold substrate with the strong binding affinity between the GBP and the gold surface, while the recognition site orients toward the sample for target binding at the same time. Furthermore, this one-step immobilization strategy greatly simplifies a fabrication process without any chemical modification as well as maintaining activity of biological recognition elements. This system allows specific immobilization of proteins and sensitive detection of targets, which were verified by surface plasmon resonance analysis and successfully applied to electrochemical cyclic voltammetry and impedance spectroscopy upto 0.14 ng/mL HBsAg.
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