研究生: |
卓淑鶯 Toh, Shu Ing |
---|---|
論文名稱: |
人類DISC1和幽門螺旋桿菌AlpA粘附素之表達、純化與結晶 Expression, Purification and Crystallization of human DISC1 and AlpA from Helicobacter pylori |
指導教授: |
鄭惠春
Cheng, Hui Chun |
口試委員: |
孫玉珠
Sun, Yuh Ju 高茂傑 Kao, Mou Chieh |
學位類別: |
碩士 Master |
系所名稱: |
生命科學暨醫學院 - 生物資訊與結構生物研究所 Institute of Bioinformatics and Structural Biology |
論文出版年: | 2016 |
畢業學年度: | 104 |
語文別: | 中文 |
論文頁數: | 89 |
中文關鍵詞: | 精神分裂症 、蛋白質 、結構 、功能 、胃幽門螺旋桿菌 、外膜蛋白 、純化 、結晶 |
外文關鍵詞: | Schizophrenia, protein, structure, function, Helicobacter pylori, adhesion protein, purification, crystallizatoin |
相關次數: | 點閱:3 下載:0 |
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精神分裂症是一種破壞性的精神障礙,被認為已經影響了1 %的全世界人口。過去研究發現DISC1基因是一種精神分裂症的分子指標,所以DISC1基因可以用來評估精神分裂疾病。但DISC1蛋白質的結構與功能之間的關係尚未被瞭解。瞭解DISC1較有功能性的結構區域,對於相關的科學應用會更有幫助。
另外,我們研究造成胃炎、胃潰瘍與胃癌等胃疾病的胃幽門螺旋桿菌外膜蛋白AlpA。AlpA的基因可以產生有助於胃幽門螺旋桿菌附著在胃上皮的蛋白。我們希望可以更瞭解AlpA蛋白質結構與功能之間的關係,這樣將會對治療與預防胃幽門螺旋桿菌所引起之胃疾病有很大的突破。
我們利用大腸桿菌表現DISC1和AlpA蛋白。再利用各種純化蛋白方法,如:Ni2+離子親和性管柱、分子篩層析、離子交換管柱、直鏈澱粉親和管柱等方法來純化DISC1_S1、S2及S3和AlpA-N2各個蛋白片段。利用蛋白結晶試劑,如:Hampton PEG/Ion HTTM、 PCT kit及Qiagen JCSG Screen等方法尋找適合DISC1及AlpA蛋白長出晶體的蛋白質濃度及蛋白結晶試劑條件。
本研究成功建立了這兩種蛋白質的純化方法。未來希望可以找尋適合這兩種蛋白長出晶體的蛋白質濃度及結晶試劑的條件,大量長出晶體,利用X光單晶繞射學解析出蛋白質晶體結構,運用於藥物設計及進一步功能上的研究。
Schizophrenia is a devastating mental disorder and is believed to have affected 1 % of the world's population. Previous research found that the DISC1 gene is a kind of the molecular marker of spirit split disorder, but the relationship between the structure and function of the DISC1 protein is not understood. An atomic model of DISC1 will help us better understand the function of DISC1.
Helicobacter pylori cause gastritis, gastric ulcer and gastric cancer. The AlpA protein is a H. pylori adhesion protein that attaches to the host gastric epithelium. We hope to better understand the relationship between the structure and function of AlpA protein, which may be beneficial for the treatment and preventatoin of Helicobacter pylori-mediated stomach diseases.
We used the E.coli system to overexpress DISC1 and AlpA proteins and used various protein purification methods, such as: Ni2+ affinity column chromatography, gel filtration chromatography, ion exchange chromatography, and amylose affinity chromatography to purify these proteins. We used protein crystallization screens, such as Hampton PEG/Ion HTTM, PCT kit and Qiagen JCSG screens to find suitable conditions for DISC1 and AlpA crystallizatoin.
This study successfully established the purification methods for various constructs of DISC1 and AlpA. However, we did not get any crystallization hits after several trials. Hopefully, our work may facilitate the crystallization experiments and further functional studies in the future.
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