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標題: | 可重複使用之穀胱甘肽修飾矽奈米線場效應電晶體 A Reusable Biosensor Using Glutathione-Modified Silicon Nanowire Field-Effect Transistor |
作者: | Kun-Chang Tseng 曾坤長 |
指導教授: | 陳逸聰(Yit-Tsong Chen) |
關鍵字: | 矽奈米線,場效應電晶體,重複使用,穀胱甘肽,生物晶片, silicon nanowire,field-effect transistor,reusable,glutathione,biosensor, |
出版年 : | 2009 |
學位: | 碩士 |
摘要: | 隨著奈米技術的演進,矽奈米線場效電晶體(silicon nanowire field-effect transistor, SiNW-FET)因其高靈敏度、免標定、可即時偵測等特性,被大量應用在研發為奈米生物感測器,近年來是許多學術團隊的熱門研究課題。此類生物感測器已成功的量測多種生物與醫學上的重要物質,包括:蛋白質、DNA、癌症標誌物、單一病毒的偵測,以及神經傳導物質等多項重要指標物,將來不論是在藥物開發上、還是生化物質快速偵測分析上,都非常具有研究潛力與應用價值。
傳統上,大部分此類的生物晶片,在修飾特定蛋白分子或是抗體時,都是以共價鍵結的方式,缺點有兩個:如果被修飾分子(probe)與被偵測分子(target)的作用是不可逆的,如抗體與抗原,那這個晶片只能使用一次;也因為probe是化學鍵結在晶片上,所以此類晶片一旦修飾後,只能做單一種類的分子偵測,兩種結果都會造成晶片的浪費。 本論文的研究主題為,建立一個可重複使用的生物晶片,因此,我們導入,一般在純化蛋白的技術上常用的穀胱甘肽(glutathione, GSH)與穀胱甘肽硫基轉移酶(glutathione S-transferase, GST)的系統。由於GSH與GST之間具有適中的作用力(Kd ~106),可進行重複的結合(association)與分離(dissociation),將其應用於SiNW-FET,便能作為可重複修飾使用蛋白分子的生物感測器。經由化學分析電子光譜、螢光實驗、原子力顯微鏡與電性量測的實驗,我們的確成功在單一晶片上,進行蛋白分子的重複修飾,而達到重複使用的目的,且能更進一步地偵測蛋白質與蛋白質之間的作用,將來極具有潛力與應用價值,發展為可快速篩選可能作用蛋白的系統平台,或是應用在偵測蛋白與DNA、RNA、醣類等其他生化分子的作用。 Over past years, the silicon nanowire field-effect transistors (SiNW-FETs) as chemical and biological sensors have attracted wide attention because of their merits of free labeling, ultrasensitivity, and real-time recording. There are many applications of SiNW-FETs, such as immuno-protein detection, DNA hybridization, virus detection, etc. However, most of applications are based on an irreversible functionalization of receptor molecules on the surface of SiNW-FETs. Consequently, one chip that could only be used for a single time to detect one protein is very wasteful in chip-consuming. Glutathione-S-transferase (GST) is widely applied to fuse with a target protein by genetic engineering in protein purification. The GST-fused protein can be separated from a lysate by the glutathione-coated beads via its high affinity for glutathione (GSH). Based on the reversible association-dissociation of GSH-GST, we provide a novel strategy of using a reusable GSH modified SiNW-FET to immobilize a GST-fusion protein and then to screen possible interacting proteins. The reversible surface-functionalization method is proven by ESCA, fluorescence imaging, atomic force microscopic imaging, and electrical measurements. The reversible GSH-GST functionality on the SiNW-FET has made this device consecutively reusable, allowing for quantitative analysis. In this work, we have successfully demonstrated that the reusability of GSH-functionalized device should be a very useful and economic biosensor. This reversible surface functionalized biosensor can potentially serve as a fast high-throughput screening platform for detecting proteins which could possibly interact with a particular GST-fused protein, and also be further applied to study biomolecular associations, such as protein-protein interactions, protein-DNA interactions, protein-carbohydrate interactions, and other similar interactions. |
URI: | http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/42927 |
全文授權: | 有償授權 |
顯示於系所單位: | 化學系 |
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