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Methods and Parameters for Membrane Simulations | p. 1 |
Introduction | p. 1 |
Force Fields/Descriptions of Interactions | p. 4 |
Current Atomistic Force Fields | p. 5 |
Development of Force Field Parameters | p. 6 |
Issues with Combining Force Fields | p. 7 |
Starting Structures | p. 7 |
Bilayers | p. 8 |
Membrane Proteins | p. 9 |
Embedding Proteins in Bilayers | p. 9 |
Sampling | p. 11 |
Improving Sampling | p. 14 |
Coarse Graining | p. 14 |
Pressure Coupling | p. 16 |
Electrostatics | p. 18 |
Periodicity | p. 19 |
Future Developments | p. 20 |
Acknowledgements | p. 21 |
References | p. 21 |
Lateral Pressure Profiles in Lipid Membranes: Dependence on Molecular Composition | p. 26 |
Introduction | p. 26 |
Theoretical Concepts | p. 31 |
Lateral Pressure Profile | p. 31 |
Calculation of Lateral Pressure Profile from Simulation | p. 32 |
Elastic Properties | p. 33 |
Interplay of Pressure Profile and Membrane Protein Activation | p. 34 |
Gauging Pressure Profile | p. 35 |
Dependence of Pressure Profiles on Molecular Composition | p. 38 |
Dependence on Unsaturation Level | p. 38 |
Effects of Different Sterols in Two-component Membranes | p. 39 |
Pressure Profiles in Three-component Bilayers | p. 41 |
Implications of Anesthetics on Pressure Profile | p. 43 |
Elastic Properties Calculated from Lateral Pressure Profile | p. 45 |
Free Energy of Protein Activation and Lateral Pressure Profile | p. 48 |
Concluding Remarks | p. 50 |
Abbreviations | p. 51 |
Acknowledgements | p. 51 |
References | p. 51 |
Coarse-grained Molecular Dynamics Simulations of Membrane Proteins | p. 56 |
Introduction | p. 56 |
Coarse-grained Simulations: Methodology | p. 57 |
CG-MD and Lipid Bilayers | p. 57 |
CG-MD and Membrane Peptides and Proteins | p. 59 |
Evaluation of CG-MD: Model Membrane Peptides | p. 61 |
Simulation Studies of Membrane Peptide Oligomerization | p. 64 |
Glycophorin A | p. 64 |
Influenza M2 Channels | p. 66 |
Coarse-grained MD: Larger Systems | p. 67 |
Vesicle Simulations | p. 67 |
More Complex Membrane Proteins | p. 69 |
Concluding Remarks and Future Directions | p. 73 |
Acknowledgements | p. 73 |
References | p. 73 |
Passive Permeation Across Lipid Bilayers: a Literature Review | p. 76 |
Introduction | p. 76 |
Experimental Methods | p. 78 |
Water and Small Organic Molecules | p. 78 |
Drugs | p. 78 |
The Solubility-Diffusion Model | p. 80 |
The z-Constraint Method | p. 81 |
Small Molecules | p. 82 |
Drugs | p. 83 |
Fullerene | p. 85 |
Discussion | p. 87 |
Conclusions | p. 87 |
References | p. 88 |
Implicit Membrane Models For Peptide Folding and Insertion Studies | p. 91 |
Introduction | p. 91 |
Implicit Membrane Models | p. 94 |
Overview | p. 94 |
Implicit Membrane Models for Studying Membrane Protein Folding | p. 95 |
The Generalized Born Model | p. 96 |
Non-polar Interactions | p. 99 |
Accuracy and Partitioning Properties | p. 100 |
Transmembrane and Surface-bound Helices, Insertion Energy Landscape | p. 102 |
Thermodynamic Analysis | p. 102 |
Simulating Peptide Folding and Partitioning | p. 104 |
Summary | p. 104 |
Transbilayer Peptide Folding | p. 104 |
Peptide Adsorption, Insertion and Folding | p. 111 |
Comparison with Explicit Methods | p. 124 |
Sampling Performance | p. 128 |
Conclusions | p. 134 |
Acknowledgements | p. 135 |
References | p. 135 |
Multi-scale Simulations of Membrane Sculpting by N-BAR Domains | p. 146 |
Introduction | p. 146 |
Methods | p. 148 |
All-atom Simulations | p. 150 |
Residue-based Coarse-grained Simulations | p. 151 |
Shape-based Coarse-grained Simulations | p. 152 |
Continuum Elastic Membrane Model | p. 157 |
Results and Discussion | p. 159 |
Simulations of a Single N-BAR Domain | p. 159 |
Comparison of RBCG and SBCG Simulations for Systems with Six N-BAR Domains | p. 161 |
Effect of Different N-BAR Domain Lattices on Membrane Curvatures | p. 164 |
Comparing All-atom and SBCG Simulations of an N-BAR Domain Lattice | p. 167 |
Complete Membrane Tubulation by Lattices of BAR Domains | p. 169 |
Elastic Membrane Computations | p. 169 |
Conclusion | p. 172 |
Acknowledgements | p. 173 |
References | p. 173 |
Continuum Electrostatics and Modeling of K+ Channels | p. 177 |
Introduction | p. 177 |
Theory and Methods | p. 180 |
The Poisson-Boltzmann (PB) Equation | p. 180 |
Calculation of Electrostatic Free Energies and Decomposition | p. 181 |
The Modified PB Equation for Treatment of Transmembrane Voltage | p. 182 |
Applications | p. 184 |
Electrostatics in the Intracellular Vestibule of K+ Channels | p. 184 |
Long-pore Electrostatics in K+ Channels | p. 191 |
K+ Channels and the Transmembrane Potential | p. 195 |
Conclusion | p. 200 |
References | p. 201 |
Computational Approaches to Ionotropic Glutamate Receptors | p. 203 |
Introduction | p. 203 |
The Amino-terminal Domain | p. 205 |
The Ligand-binding Domain (LBD) | p. 207 |
Selectivity and Modulation | p. 207 |
Dynamics | p. 209 |
The Transmembrane Domain | p. 216 |
Conclusion | p. 218 |
Acknowledgements | p. 218 |
References | p. 218 |
Molecular Dynamics Studies of Outer Membrane Proteins: a Story of Barrels | p. 225 |
Introduction | p. 225 |
Outer Membrane Proteins | p. 226 |
Simple Barrels | p. 227 |
OmpA and Its Homologues | p. 227 |
Simple OMPs in Diverse Environments | p. 230 |
Leaking Barrels | p. 232 |
Transporting Barrels | p. 232 |
TonB-dependent Transporters | p. 233 |
Autotransporters | p. 235 |
TolC | p. 237 |
Reacting Barrels | p. 239 |
Technological Barrels | p. 241 |
Conclusion | p. 243 |
Acknowledgements | p. 244 |
References | p. 244 |
Molecular Mechanisms of Active Transport Across the Cellular Membrane | p. 248 |
Introduction | p. 248 |
Computational Methodology | p. 250 |
Electrostatic Potential Calculation | p. 251 |
Net Charge Density Distribution Calculation | p. 251 |
ATP-driven Transport in ABC Transporters | p. 252 |
Ion-driven Neurotransmitter Uptake by the Glutamate Transporter | p. 258 |
Substrate Binding and Selectivity in Glycerol-3-Phosphate Transporter | p. 263 |
Membrane Potential-driven Nucleotide Exchange in ADP/ATP Carrier | p. 268 |
Mechanically Driven Transport Across the Outer Membrane | p. 272 |
Conclusion | p. 277 |
Acknowledgements | p. 278 |
References | p. 278 |
Molecular Dynamics Studies of the Interactions Between Carbon Nanotubes and Biomembranes | p. 287 |
Introduction | p. 287 |
Carbon Nanotube Structure | p. 288 |
Experimental Techniques for Studying CNTs in a Biological Environment | p. 289 |
Molecular Dynamics Simulations | p. 289 |
Methodology | p. 290 |
Parameterization of CNT Models | p. 290 |
CNT Interactions with Lipids and Related Molecules | p. 292 |
Interaction of CNTs with Lipid Bilayers | p. 296 |
CNTs as Nanopores | p. 298 |
Transport of Water and Ions Through CNT Nanopores | p. 299 |
Nanopores as Nanosyringes | p. 301 |
Conclusion | p. 302 |
References | p. 302 |
Subject Index | p. 306 |
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