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Dynamics and Mechanism of Dna-Bending Proteins in Binding Site Recognition
Paperback
Series: Springer Theses
BiologyChemistryGeneral Science
ISBN13: 9783319832180
Publisher: Springer Nature
Published: Jul 4 2018
Pages: 199
Weight: 0.70
Height: 0.47 Width: 6.14 Depth: 9.21
Language: English
I INTRODUCTION...................................... 1
1.1 Protein-DNA interactions ............... 1
1.2 Sequence-dependent DNA deformability and its role in target recognition 3
1.2.1 Free energy cost for local deformation of DNA. ............... 6
1.2.2 Sequence-dependent base-pair opening rate measured by NMR imino proton exchange ............... 8
1.2.3 How do site-specific proteins search for their target sites on genomic DNA? ...... 9
1.2.4 How do site-specific proteins recognize their target sites? ............... 11
1.2.5 Conformational capture or protein-induced DNA bending............... 14
1.2.6 Measurements of DNA binding and bending kinetics ............... 14
1.2.7 Competition between 1-D diffusion and binding-site recognition: the speed-stability paradox. .................. 16
1.3 Experimental techniques to study dynamics of protein-DNA interactions... 17
1.3.1 Laser temperature-jump spectroscopy. ......... 18
1.4 Thesis Overview............... 20
II METHODS.................................................................... 33
2.1 Equilibrium measurements............... 332.2 Laser Temperature Jump technique............... 33
2.2.1 Laser Temperature jump spectrometer ......... 35
2.2.2 Theoretical estimation of the size of the T-jump............... 38
2.2.3 Photo-acoustic effects and cavitation. ............... 39
2.2.4 Estimation of temperature jump using reference sample in a T-jump experiment............... 40
2.2.5 T-jump recovery kinetics............... 43
2.2.6 Discrete single- or double-exponential decay convoluted with T-jump recovery 46
2.2.7 Acquisition and matching of relaxation traces measured over different time-scales 46
2.2.8 Maximum entropy analysis............... 48
2.3 Equilibrium FRET measurements............... 50
2.4 Nucleotide analog 2-Aminopurine (2AP) ............... 59
2.5 Fraction of Protein and DNA in complex at Equilibrium............... 61
III Integration Host Factor (IHF)-DNA interaction...............................67
3.1 Introduction............... 67
3.1.1 Integration host factor (IHF) ............... 67
3.1.2 IHF binds to the minor groove on DNA and recognizes its specific site via indirect readout............... 68
3.1.3 Structure of IHF-H' complex............... 69
3.1.4 Background of IHF/H' interaction dynamics ............... 73
3.1.5 Binding site recognition versus protein diffusional search............... 78
3.2 Results............... 80
3.2.1 DNA bending kinetics in the IHF - H' complex are biphasic............... 80
3.2.2 The slow phase occurs on the same time scale as spontaneous bp
opening at a kink site. ............... 82
3.2.3 Introducing mismatches at the site of the kinks affects the slow
phase but not the fast phase. ............... 843.2.4 DNA bending rates in the slow phase of IHF- TT8AT
complex reflect enhanced base-pair opening rates in mismatched DNA............... 90
3.2.5 DNA modifications away from the kink sites have no effect
on either of the two rates. ............... 92
3.2.6 Two plausible scenarios for biphasic relaxation kinetics............... 95
3.2.7 Salt-dependence of the fast and slow components. ............... 95
3.2.8 Protein mutations distal to the kink sites affect affinity and bending rate of slow phase............... 101
3.2.9 Control experiments to rule out contributions to the relaxation kinetics from dye dynamics or dye interactions with protein or DNA................ 108
3.3 Discussion............... 112
3.4 Concluding Remarks............... 117
IV LESION RECOGNITION BY XERODERMA PIGMENTOSUM C (XPC)PROTEIN..................................................................124
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