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Over expression, purification and characterization of hepatitis B virus X protein (HBx) and its interacting partner HBx - interacting protein (XIP).

by Cheung Yuk Yin. / Thesis (M.Phil.)--Chinese University of Hong Kong, 2002. / Includes bibliographical references (leaves xx-xxviii). / Abstracts in English and Chinese. / Acknowledgements --- p.i / Abstract --- p.ii / 摘要 --- p.iii / Table of Content --- p.iv / Abbreviations / for Amino Acids --- p.viii / for Standard Genetic Code --- p.ix / for Units --- p.x / for Prefixes --- p.xi / for Terms commonly used in the report --- p.xii / List of Figures --- p.xiii / List of Tables --- p.xiv / Chapter Chapter 1 --- Introduction / Chapter 1.1 --- Epidemiology of Hepatitis B Virus (HBV) --- p.1 / Chapter 1.2 --- Relationship between Hepatitis B Virus and Hepatocellular Carcinoma --- p.2 / Chapter 1.3 --- Brief Description of HBV Genome --- p.2 / Chapter 1.4 --- Possible Roles of HBx in Hepatocellular Carcinoma --- p.4 / Chapter 1.5 --- Novel Interacting Partner of HBx - HBx-lnteracting Protein (XIP) --- p.6 / Chapter 1.6 --- Objective --- p.6 / Chapter Chapter 2 --- Methodology / Chapter 2.1 --- Information of the HBx and XIP Clones --- p.7 / Chapter 2.2 --- "Information of the Expression Vectors (pRSETA, 6xHis-pRSETA and pET8C)" --- p.7 / Chapter 2.3 --- Sub-Cloning of HBx and XIP into Different Vectors --- p.9 / Chapter 2.3.1 --- Design of Primers for Cloning of HBx and XIP into Different Vectors --- p.9 / Chapter 2.3.2 --- Polymerase Chain Reaction (PCR) Protocol --- p.12 / Chapter 2.3.3 --- Enzyme Digestion Reaction Protocol --- p.14 / Chapter 2.3.4 --- Ligation Protocol --- p.16 / Chapter 2.3.5 --- Preparation of Competent Cells --- p.17 / Chapter 2.3.6 --- Transformation --- p.18 / Chapter 2.3.7 --- Gel Extraction Protocol --- p.19 / Chapter 2.3.7.1 --- Life Technologies CONCERT´ёØ Rapid Gel Extraction System --- p.19 / Chapter 2.3.7.2 --- QIAGEN Gel Extraction Kit --- p.20 / Chapter 2.3.8 --- Plasmid Preparation Protocol --- p.22 / Chapter 2.3.8.1 --- Life Technologies CONCERT´ёØ Rapid Plasmid Minipreps --- p.22 / Chapter 2.3.8.2 --- QIAGEN Plasmid Maxi Kit --- p.23 / Chapter 2.4 --- Expression of HBx and XIP in E. coli Strain C41 (DE3) --- p.25 / Chapter 2.4.1 --- Transformation --- p.25 / Chapter 2.4.2 --- Expression of HBx and 6xHis-HBx in E. coli Strain C41 (DE3) --- p.26 / Chapter 2.4.3 --- Expression of XIP in E. coli Strain C41 (DE3) --- p.27 / Chapter 2.5 --- Preparation of Buffers for Chromatography and Circular Dichroism Spectrum Measurement --- p.28 / Chapter 2.6 --- Purification and Refolding of HBx and His-Tagged HBx --- p.28 / Chapter 2.6.1 --- Washing of HBx and His-Tagged HBx Inclusion Bodies --- p.28 / Chapter 2.6.2 --- His-Tagged HBx Purification by Affinity Chromatography --- p.29 / Chapter 2.6.3 --- HBx Purification by Size Exclusion Chromatography --- p.30 / Chapter 2.6.4 --- Refolding of HBx and His-Tagged HBx by Oxidative Dialysis --- p.30 / Chapter 2.7 --- Purification of XIP --- p.33 / Chapter 2.7.1 --- Screening of Chromatographic Conditions for the Purification of XIP --- p.33 / Chapter 2.7.2 --- XIP 1st Step of Purification by Hydrophobic Interaction Chromatography --- p.34 / Chapter 2.7.3 --- XIP 2nd step of Purification by Size Exclusion Chromatography --- p.34 / Chapter 2.8 --- Chemical Denaturation Experiment of HBx and XIP --- p.36 / Chapter 2.8.1 --- Preparation of Urea Buffers for the Chemical Denaturation of HBx --- p.37 / Chapter 2.8.2 --- Preparation of Different GdnHCI Buffer for the Chemical Denaturation of XIP --- p.38 / Chapter 2.8.3 --- Calculation for Chemical Denaturation Experiment --- p.39 / Chapter 2.8.3.1 --- Protein Concentration Calculation --- p.39 / Chapter 2.8.3.2 --- Residual Molar Elipticity Calculation --- p.39 / Chapter 2.8.3.3 --- Free Energy Change (ΔGu) Calculation --- p.40 / Chapter 2.9 --- Two-dimensional Heteronuclear Nuclear Magnetic Resonance (NMR) Experiment --- p.41 / Chapter 2.10 --- Interaction Confirmation between HBx and XIP --- p.42 / Chapter 2.10.1 --- "Transfection of pEGFP, pEGFP-HBx and pEGFP-XIP into HepG2" --- p.42 / Chapter 2.10.2 --- Yeast Two Hybrid System for Confirmation of HBx and XIP Interaction --- p.44 / Chapter 2.10.2.1 --- Preparation of Y187 Competent Cells --- p.44 / Chapter 2.10.2.2 --- Transformation of pGBKT7-HBx and pACT2-XIP into Y187 --- p.45 / Chapter 2.10.2.3 --- β-galactosidase Colony Lift Assay --- p.46 / Chapter Chapter 3 --- "Expression, Purification and Characterization of Hepatitis B Virus X Protein (HBx)" / Chapter 3.1 --- Introduction --- p.47 / Chapter 3.2 --- Construction of Recombinant HBx-pRSETA and 6xHis-HBx-pRSETA Plasmids --- p.48 / Chapter 3.3 --- Expression of 6xHis-HBx in E. coli C41 (DE3) using M9ZB Medium --- p.52 / Chapter 3.4 --- Expression of HBx in E. coli C41 (DE3) using M9ZB Medium --- p.54 / Chapter 3.5 --- Purification and Refolding of 6xHis-HBx Fusion Proteins --- p.56 / Chapter 3.6 --- Purification and Refolding of HBx Proteins --- p.60 / Chapter 3.7 --- Structural Characterization of Refolded HBx --- p.65 / Chapter 3.7.1 --- Introduction --- p.55 / Chapter 3.7.2 --- Experimental Analysis of HBx Secondary Structure --- p.66 / Chapter 3.7.3 --- Chemical Unfolding Experiment of HBx --- p.68 / Chapter 3.8 --- Discussion --- p.70 / Chapter 3.8.1 --- "HBx was Expressed, Purified and Characterized instead of 6xHis-HBx" --- p.71 / Chapter 3.8.2 --- High Concentration of DTT was used to Minimize Formation of HBx Aggregates --- p.72 / Chapter 3.8.3 --- Oxidative Refolding to Ensure Proper Disulfide Bond Formation --- p.73 / Chapter 3.8.4 --- Computational Prediction and Experimental Prediction of Secondary Structure of HBx --- p.75 / Chapter 3.9 --- Concluding Remarks --- p.77 / Chapter Chapter 4 --- "Expression, Purification and Characterization of HBx-lnteracting Protein (XIP)" / Chapter 4.1 --- Introduction --- p.78 / Chapter 4.2 --- Construction of Recombinant XIP-pET8C --- p.78 / Chapter 4.3 --- Expression of XIP in E. coli C41 (DE3) using M9ZB and M9 Mediums --- p.82 / Chapter 4.4 --- Screening of Chromatographic Conditions for the Purification of XIP --- p.83 / Chapter 4.4.1 --- Introduction --- p.83 / Chapter 4.4.2 --- Purification Details --- p.83 / Chapter 4.5 --- Purification of XIP by HiTrap Phenyl HP 5-ml Column --- p.87 / Chapter 4.6 --- Purification of XIP by HiLoad 26/60 Superdex 75 Prep Grade --- p.89 / Chapter 4.7 --- Structural Characterization of XIP --- p.92 / Chapter 4.7.1 --- CD Spectrum --- p.92 / Chapter 4.7.2 --- Chemical Denaturation Experiment of XIP --- p.93 / Chapter 4.7.3 --- Two-Dimensional Heteronuclear Nuclear Magnetic Resonance (NMR) Spectrum of 15N Labeled XIP --- p.95 / Chapter 4.8 --- Discussion --- p.97 / Chapter 4.8.1 --- Purification Method Development --- p.97 / Chapter 4.8.2 --- "Do Different Protein Cosolutes, Protein Stabilizers and Detergents Help XIP to Adopt a Stable Conformation?" --- p.99 / Chapter 4.9 --- Concluding Remarks --- p.101 / Chapter Chapter 5 --- In vivo Studies of HBx and XIP Interactions / Chapter 5.1 --- Investigation of Sub-Cellular Localization of HBx and XIP in Liver Cells --- p.102 / Chapter 5.1.1 --- Introduction --- p.102 / Chapter 5.1.2 --- "Construction of Recombinant HBx-pECFP-C1, HBx-pEGFP-C1, HBx-pEYFP-C1 and XIP-pECFP-C1, XIP-pEGFP-C1, XIP-pEYFP-C1" --- p.103 / Chapter 5.1.3 --- Transfection of pEGFP-C1 HBx and pEGFP-C1 XIP into HepG2 to Find Out HBx and XIP Sub-Cellular Localization --- p.106 / Chapter 5.1.3.1 --- Introduction --- p.107 / Chapter 5.1.3.2 --- Investigation of EGFP Proteins Expression using the Confocal Microscope and the Leica TCS Software --- p.108 / Chapter 5.1.4 --- Discussion and Future Prospects --- p.111 / Chapter 5.2 --- Interaction of HBx and XIP Studied by Yeast Two-Hybrid System --- p.113 / Chapter 5.2.1 --- Introduction --- p.113 / Chapter 5.2.2 --- Construction of Recombinant HBx-pGBKT7 and XIP-pACT2 Plasmids --- p.114 / Chapter 5.2.3 --- Confirmation of HBx and XIP Interaction by Yeast Two-Hybrid System --- p.117 / Chapter 5.2.4 --- Discussion --- p.121 / Chapter Chapter 6 --- Conclusion --- p.123 / Appendix I Sequence of HBx and XIP --- p.I / Chapter II --- Vector Sequences --- p.II / Chapter III --- Vector Maps --- p.VI / Chapter IV --- Electrophoresis Markers --- p.XI / Chapter V --- Agarose Gel Electrophoresis --- p.XII / Chapter VI --- SDS-PAGE Eectrophoresis --- p.XIII / Chapter VII --- Medium for Bacterial Culture --- p.XV / Chapter VIII --- Medium for Cell Culture --- p.XVII / Chapter IX --- Medium for Yeast Culture --- p.XVIII / Chapter X --- Buffers for Yeast Transformation --- p.XIX / Reference --- p.XX

Identiferoai:union.ndltd.org:cuhk.edu.hk/oai:cuhk-dr:cuhk_323994
Date January 2002
ContributorsCheung, Yuk Yin., Chinese University of Hong Kong Graduate School. Division of Biochemistry.
Source SetsThe Chinese University of Hong Kong
LanguageEnglish, Chinese
Detected LanguageEnglish
TypeText, bibliography
Formatprint, xiv, 123, xxviii leaves : col. ill., 1 col. map ; 30 cm.
RightsUse of this resource is governed by the terms and conditions of the Creative Commons “Attribution-NonCommercial-NoDerivatives 4.0 International” License (http://creativecommons.org/licenses/by-nc-nd/4.0/)

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