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請用此 Handle URI 來引用此文件: http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/61807
完整後設資料紀錄
DC 欄位值語言
dc.contributor.advisor陳佩燁(Rita Pei-Yeh Chen)
dc.contributor.authorChe Yangen
dc.contributor.author楊哲zh_TW
dc.date.accessioned2021-06-16T13:13:58Z-
dc.date.available2016-08-06
dc.date.copyright2013-08-06
dc.date.issued2013
dc.date.submitted2013-07-30
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dc.identifier.urihttp://tdr.lib.ntu.edu.tw/jspui/handle/123456789/61807-
dc.description.abstract普立昂疾病為一類致命且具傳染力之神經退化性疾病,主要病徵為在人類或動物中樞神經系統中產生異常纖維性澱粉堆疊進而造成海綿狀病變。正常的普立昂蛋白(PrPC)以α螺旋為主要結構且執行正常生理功能;當產生普立昂疾病時,蛋白結構會轉變為以β摺板為主的致病性、堆疊型普立昂蛋白(PrPSc),此異常的分子結構轉變即是造成細胞毒性之主要原因。但至今,我們仍然不明白有哪些二級結構以及胺基酸參與在普立昂蛋白結構轉變的過程。本實驗室先前的研究發現:移除雙硫鍵的老鼠普立昂蛋白在中性且近乎生理環境的條件下,會進行自發性的結構轉變,並且能夠利用中性溶液固定此重組普立昂蛋白在特定的結構狀態,基於先前的重要發現,使我們得以詳細分析普立昂蛋白結構轉變的機制。
本篇論文主要著重於觀察普立昂蛋白中三段α螺旋在整體結構轉變時,α螺旋局部二級結構變化,並利用電子自旋共振、圓二色光譜儀、穿透式電子顯微鏡、分析級超高速離心及單分子螢光共振能量轉換等技術研究此結構轉換的過程。本篇結果顯示:helix 1以及helix 3在整體結構轉變至β型態時仍會保持α螺旋結構;然而helix 2在整體結構轉變為β型態時,α螺旋則會完全解開,顯示helix 2參與蛋白整體的結構變化。當蛋白整體結構在β型態時,helix 2會產生分子間作用的現象,說明helix 2間的作用力穩定β-oligomers結構;而普立昂蛋白形成纖維狀結構時,helix 2和helix 3更進一步參與纖維性澱粉核心(amyloid core)的形成,並搭配著helix 1或是loop上的殘基提供額外的分子間作用力穩定整體纖維狀結構。
zh_TW
dc.description.abstractPrion diseases are not only fetal but also infectious neurodegenerative disorders. The critical molecular event of prion diseases is the structural conversion of a normal cellular prion protein, PrPC, into a misfolded, infectious form, PrPSc. The overall structure of the prion protein transits from α- to β-dominant state, giving rise to formation of toxic amyloid fibrils. Up to now, the structural transition mechanism is still elusive. Recently, our lab found that disulfide-bond reduced mouse prion protein could be fixed in α-helical or β-rich structure under neutral condition. This finding provides us an opportunity to dissect the conversion process in details. To examine the role of three α-helices in mPrP during this structural conversion process, site-directed spin-labeling technique (SDSL), electron spin resonance spectroscopy (ESR), analytical ultracentrifugation (AUC), transmission electron microscopy (TEM), circular dichroism spectroscopy (CD), and single molecule fluorescence resonance energy transfer (smFRET) were employed. In this study, we suggest that helix 1 and helix 3 are intact no matter in α- or β-state; however, helix 2 is unfolded after structural converted to β-oligomers. Only the residues in helix 2 are involved in intermolecular association in β-state, suggesting helix 2 is crucial for oligomerization process. In addition, the tertiary structural contact between helix 3 and loop is dragged open after structural transition. In fibril state, helix 2 and helix 3 cooperatively participate in association of amyloid core and helix 1 or loop supplies peripheral interaction to stabilize the fibril structure as well.en
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en
dc.description.tableofcontents謝辭 i
中文摘要 iii
Abstract iv
Abbreviations vi
Contents ix
Figure contents xiii
Table contents xvii
Chapter 1 Introductions 1
1.1 Prion diseases 1
1.2 The structure and physiological function of PrPC 5
1.3 Conversion mechanism of PrP isoforms 9
1.4 Models of PrPSc 11
1.5 Electron Spin Resonance (ESR) 16
1.5.1 Background of ESR 16
1.5.2 Spin-spin distance 20
1.5.3 Pulsed dipolar ESR 22
1.6 Single molecule fluorescence resonance energy transfer (smFRET) 26
1.7 Previous studies in our lab 31
1.8 The aims of this thesis 32
Chapter 2 Materials and Methods 35
2.1 Materials 35
2.1.1 Water 35
2.1.2 Chemicals 35
2.2 Methods 39
2.2.1 Site-directed mutagenesis and constructs cloning 39
2.2.2 Small-scale protein expression 41
2.2.3 Large-scale protein expression, purification, and identification 41
2.2.3.1 Glycerol cell stock preparation 41
2.2.3.2 Expression of recombinant mouse PrP in E. coli and cell lysis 42
2.2.3.3 Metal-ion affinity chromatography (IMAC) 43
2.2.3.4 HPLC purification and protein identification 43
2.2.4 Secondary structure analysis by circular dichroism and CDPro 45
2.2.5 Analytical ultracentrifugation (AUC) 46
2.2.6 Transmission electron microscopy (TEM) 47
2.2.7 Fibril formation and ThT (thioflavin T) binding assay 47
2.2.8 Spin-labeling and purification 49
2.2.9 Electron spin resonance (ESR) 50
2.2.10 Cytotoxicity assay 52
2.2.11 Single molecule fluorescence energy transfer (smFRET) 53
2.2.12 Models of structure 55
Chapter 3 Results - Preparation 57
3.1 Expression of mutant mouse prion protein constructs 57
3.2 Small expression of mPrP mutants 60
3.3 Large-scale expression 61
3.4 Primary purification: Metal-ion affinity chromatography (IMAC) 61
3.5 Secondary purification: High-performance liquid chromatography (HPLC) 62
3.6 Spin-labeling and purification 64
3.7 Fluorescent dye labeling and purification 65
3.8 Protein identification and storage 68
Chapter 4 Results 70
4.1 Dissecting the mutant PrP in particular structural states 70
4.1.1 pH values and concentration of salt 71
4.1.2 Spin-labeling effect 74
4.1.3 Influence of protein concentration 75
4.1.4 Confined material effect: Glycerol and mesopore 77
4.1.4.1 Glycerol 77
4.1.4.2 Mesopore 78
4.1.5 Spontaneously structural conversion in native condition 80
4.1.5.1 Self-generated structural transition in native condition 80
4.1.5.2 Acceleration in structural transition by adding reducing agent 82
4.2 Cytotoxicity of β-oligomers to mammalian cells 84
4.2.1 Oligomer formation 85
4.2.2 Cytotoxicity of oligomers 89
4.3 ESR: Spin mobility in different residues 91
4.3.1 Encapsulated capability of Zr-SBA for β-oligomers 91
4.3.2 Spin mobility in α- and β-state 93
4.4 ESR: Model of structural conversion in helices 96
4.4.1 Helix 1 97
4.4.1.1 D147R1/R151R1 98
4.4.1.2 D144R1/R151R1 104
4.4.2 Helix 2 108
4.4.3 Helix 3 117
4.4.4 Helix 3 and loop 121
4.4.4.1 ESR experiment 121
4.4.4.2 SmFRET experiment 127
4.5 Amyloid fibril structure 134
4.5.1 Characterization of fibrillization 134
4.5.2 ESR: helical structure in amyloid fibril 135
4.5.2.1 Helix 1 136
4.5.2.2 Helix 2 138
4.5.2.3 Helix 3 141
4.5.2.4 Helix 3 and loop 143
4.6 Comparison between each states of PrP 144
Chapter 5 Discussion 147
Chapter 6 Future work 156
References 158
Appendix 167
HPLC chromatograms (1) 167
HPLC chromatograms (2) – labeling 170
Mass results 175
dc.language.isoen
dc.subject螺旋結構zh_TW
dc.subject纖維狀結構zh_TW
dc.subjectα型態zh_TW
dc.subject普立昂蛋白zh_TW
dc.subjectβ型態zh_TW
dc.subject結構轉變zh_TW
dc.subjectamyloid fibrilen
dc.subjectstructural conversionen
dc.subjecthelical structureen
dc.subjectα-PrPen
dc.subjectβ-PrPen
dc.subjectPrion proteinen
dc.title探討老鼠普立昂蛋白從α至β結構轉變的機制zh_TW
dc.titleExploring the α-to-β structural conversion mechanism for mouse prion proteinen
dc.typeThesis
dc.date.schoolyear101-2
dc.description.degree碩士
dc.contributor.oralexamcommittee王勝仕(Steven Sheng-Shih Wang),江昀緯(Yun-Wei Chiang),李政怡(Cheng-I Lee)
dc.subject.keyword普立昂蛋白,結構轉變,螺旋結構,α型態,β型態,纖維狀結構,zh_TW
dc.subject.keywordPrion protein,structural conversion,helical structure,α-PrP,β-PrP,amyloid fibril,en
dc.relation.page198
dc.rights.note有償授權
dc.date.accepted2013-07-30
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