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大肠杆菌QseB/QseC信号途径影响染色体复制起始和细胞运动

Abstract第4-5页
摘要第6-8页
Prior publications第8-15页
List of abbreviations第15-16页
Chapter one The Escherichia coli DNA replication and two-component signaling systems/Literature review/第16-35页
    1.1 The Escherichia coli K-12 bacterium第16-17页
    1.2 Initiation of DNA replication第17-21页
    1.3 Bacterial signaling systems第21-22页
    1.4 Quorum sensing system第22-24页
    1.5 Two-component system第24-27页
    1.6 Signal transduction第27-28页
    1.7 The QseB/QseC two-component system第28-31页
    1.8 The flagella regulon第31-35页
Chapter two The QseB/QseC signaling affects initiation of DNA replication and cell motility inEscherichia coli第35-72页
    2.1 Overall objective第35-36页
    2.2 Introduction第36-39页
    2.3 Materials and methods第39-53页
        2.3.1 Bacterial strains and plasmids第39-41页
        2.3.2 Primers第41-42页
        2.3.3 Medium第42-44页
        2.3.4 Buffer and stock solutions第44-46页
        2.3.5 Antibiotics第46页
        2.3.6 Enzymes第46页
        2.3.7 Recombinant DNA techniques第46-47页
        2.3.8 Determination of doubling time第47页
        2.3.9 Agarose gel electrophoresis第47页
        2.3.10 Preparation competent cell第47-48页
        2.3.11 Transformation第48页
        2.3.12 Measurement of cell size第48-49页
        2.3.13 Polymerase chain reaction第49页
        2.3.14 Flow cytometry第49-50页
        2.3.15 Motility assay第50-51页
        2.3.16 Subcellular localization of protein第51页
        2.3.17 Purification of QseB第51页
        2.3.18 Bacterial two-hybrid assay第51页
        2.3.19 P1 transduction第51-52页
        2.3.20 Western blotting第52-53页
    2.4 Results第53-70页
        2.4.1 The QseB/QseC signaling influences initiation of DNA replication第53-61页
            2.4.1.1 Absence of QseB/QseC leads to early initiation of DNA replication第53-54页
            2.4.1.2 Over-expression of qseB delays initiation of DNA replication第54-55页
            2.4.1.3 The QseB protein does not directly interact with oriC region第55-57页
            2.4.1.4 Absence of QseB enhances concentration of the DnaA protein第57-58页
            2.4.1.5 Absence of the fliM, fliQ, fliP or fliO gene delays initiation of DNA replication第58-61页
        2.4.2 The QseB/QseC signaling affects cell motility but not cell size第61-65页
            2.4.2.1 Absence of the qseB gene increases cell motility第61-62页
            2.4.2.2 Flagelar proteins are required for cell motility第62-63页
            2.4.2.3 Absence of QseB/QseC signaling does not but of flagelar genes influences cells size第63-65页
        2.4.3 The QseC protein localizes at cell membrane while QseB in cytosol第65-66页
        2.4.4 The QseB protein interact with the DnaK and FtsZ proteins第66-70页
            2.4.4.1 Several proteins are co-immunoprecipitated with QseB-GFP protein第66页
            2.4.4.2 The QseB protein to directly interact with DnaK and FtsZ proteins in vivo第66-68页
            2.4.4.3 Absence of the DnaK or FtsZ protein decreases cell motility第68-70页
    2.5 Discussion第70-72页
References第72-83页
Acknowlodgements第83页

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