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Coarse-grained molecular dynamics and continuum models for the transport of protein molecules

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Release : 2014
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Kind : eBook
Book Rating : 173/5 ( reviews)

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Book Synopsis Coarse-grained molecular dynamics and continuum models for the transport of protein molecules by : Marco Bacci

Download or read book Coarse-grained molecular dynamics and continuum models for the transport of protein molecules written by Marco Bacci. This book was released on 2014. Available in PDF, EPUB and Kindle. Book excerpt: The present work makes use of coarse-grained molecular dynamics simulations and continuum models to investigate the behavior of biomolecules in experiments such as mechanical pulling and driven transport across nanopores. The approach reproduces the wide phenomenology of experiments and allows one to maintain the main features of the transport by modeling the process as a 1D dynamics in a suited potential of the mean force. The standard 1D continuum view is enriched by proposing a model for the description of the shape of isolated molecules based on a tensorial representation and Cauchy-Born rule. Results indicate limitations for unconstrained dynamics and appropriateness for driven ones.

Coarse-Grained Molecular Dynamics

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Release : 2017-11
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Kind : eBook
Book Rating : 856/5 ( reviews)

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Book Synopsis Coarse-Grained Molecular Dynamics by : Maria Emilova Velinova

Download or read book Coarse-Grained Molecular Dynamics written by Maria Emilova Velinova. This book was released on 2017-11. Available in PDF, EPUB and Kindle. Book excerpt: The book entitled Coarse-Grained Molecular Dynamics Simulations provides an overview of the most used coarse-grained (CG) techniques and their applications on different systems. The CG methods offer results for larger systems over a long period of time that are not obtainable with the all-atom description of these systems. The thermodynamics-based, structural-based and force matching methods for constructing potentials, used in the building of effective CG models, are discussed in the first part of the book. In this part also is highlighted some significant application of the coarse-grained molecular dynamics simulations in biochemistry and medicine. The rest of the book gives a detailed description of different CG models, constructed for specific molecules and systems. Proteins and peptides, topic of part 2 of the book, are scientifically interesting objects, as well as, for their medical importance as potential drugs. Most of the current docking procedures are focused on all-atoms conformational adjustments and fail to reproduce large-scale protein motion. CABS-dock, which employs a coarse-grained representation of proteins, is one of the very few tools that allow unrestrained docking with large conformational freedom of the receptor. Another CG technique used for a description of protein folding and dynamics is the Gō-like model in which each amino acid residue is represented as a single unified atom, and either an attractive or a repulsive interaction is defined between any two residues. In this part of the book are also shown interesting investigations of interactions of proteins with lipid bilayers on CG level. Computer modelling of very large bimolecular systems, such as long DNA and RNA cannot reach the all-atom resolution in a foreseeable future and this necessitates the development of CG approximations. Part 3 of the book present different CG models used for prediction of structures, solution properties and dynamics of DNAs and RNAs. The last part of the book, Coarse-Grained Models for Lipids, collect a big selection of researches in the area. The fundamental building blocks of all cell membranes are phospholipids. Phospholipid molecules can demonstrate more than one micellar structures, which play important role in drug delivery systems as well as in biological systems. The use of CG models in exploring a variety of structural and dynamic properties of large molecular systems built from lipid molecules is discussed in details. The CG-MD technique can provide a good approximation based on the selection of the interaction parameters, as well as filling the gap between theoretical and experimentally determined results. Although CG-MD has provided valuable information for understanding the different phenomenon, there is still limits in its application, but the continuous theoretical developments guarantee the fast progress of this area.

Coarse-grained Structural Modeling of Molecular Motors

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Author :
Release : 2011
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Kind : eBook
Book Rating : /5 ( reviews)

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Book Synopsis Coarse-grained Structural Modeling of Molecular Motors by : David William Parker

Download or read book Coarse-grained Structural Modeling of Molecular Motors written by David William Parker. This book was released on 2011. Available in PDF, EPUB and Kindle. Book excerpt: Molecular motors perform central functions in fundamental biological processes, including cell division, DNA replication, muscle contraction, and intracellular transport. Experimental and computational approaches are needed to uncover the mechanisms by which molecular motors convert chemical energy into mechanical work. A software system called Protein Mechanica has been developed to generate structurally realistic models of molecular motor conformations compatible with experimental data from different sources. It facilitates the construction of models of protein geometry from atomic resolution structures, lower-resolution electron microscopy data and parametric solids. Coarse-grained models of molecular structures are constructed by combining groups of atoms into a system of rigid bodies connected by joints. Contacts between rigid bodies enforce excluded volume constraints, and spring potentials model system elasticity. This simplified representation allows the conformations of complex molecular motors to be simulated interactively, providing a tool for hypothesis building and quantitative comparisons between models and experiments. Protein Mechanica was used to build an atomic-resolution model of a mouse brain myosin V, a dimeric cellular transport motor, in pre- and post powerstroke conformations from partial X-ray crystal structures. A mechanical analysis of the head-neck region model was performed using normal mode analyses and molecular dynamics simulations to guide the construction of a coarse-grained models. The coarse-grained model of myosin V enabled examination of its conformations bound to its actin track. Elastic strain energies calculated from simulations are compatible with observations of single myosin V motors traversing suspended actin filaments that infer that the motor uses a combination of 11 subunit and 13 subunit stride sizes. These calculations extend previous simple mechanical models for step size selection and processivity, and provide atomically detailed models for comparison with future experiments. The Protein Mechanica software described in this dissertation provides a new tool for structural modeling of many different molecular machines, basic understanding and engineering design.

Statistical Thermodynamics Of Surfaces, Interfaces, And Membranes

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Release : 2018-03-08
Genre : Science
Kind : eBook
Book Rating : 763/5 ( reviews)

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Book Synopsis Statistical Thermodynamics Of Surfaces, Interfaces, And Membranes by : Samuel Safran

Download or read book Statistical Thermodynamics Of Surfaces, Interfaces, And Membranes written by Samuel Safran. This book was released on 2018-03-08. Available in PDF, EPUB and Kindle. Book excerpt: Understanding the structural and thermodynamic properties of surfaces, interfaces, and membranes is important for both fundamental and practical reasons. Important applications include coatings, dispersants, encapsulating agents, and biological materials. Soft materials, important in the development of new materials and the basis of many biological systems, cannot be designed using trial and error methods due to the multiplicity of components and parameters. While these systems can sometimes be analyzed in terms of microscopic mixtures, it is often conceptually simpler to regard them as dispersions and to focus on the properties of the internal interfaces found in these systems. The basic physics centers on the properties of quasi-two-dimensional systems embedded in the three-dimensional world, thus exhibiting phenomena that do not exist in bulk materials. This approach is the basis behind the theoretical presentation of Statistical Thermodynamics of Surfaces, Interfaces, and Membranes. The approach adapted allows one to treat the rich diversity of phenomena investigated in the field of soft matter physics (including both colloid/interface science as well as the materials and macromolecular aspects of biological physics) such as interfacial tension, the roughening transition, wetting, interactions between surfaces, membrane elasticity, and self-assembly. Presented as a set of lecture notes, this book is aimed at physicists, physical chemists, biological physicists, chemical engineers, and materials scientists who are interested in the statistical mechanics that underlie the macroscopic, thermodynamic properties of surfaces, interfaces, and membranes. This paperback edition contains all the material published in the original hard-cover edition as well as additional clarifications and explanations.

Molecular Dynamics

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Author :
Release : 1990
Genre : Medical
Kind : eBook
Book Rating : 196/5 ( reviews)

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Book Synopsis Molecular Dynamics by : Goodfellow

Download or read book Molecular Dynamics written by Goodfellow. This book was released on 1990. Available in PDF, EPUB and Kindle. Book excerpt: Molecular dynamics is an important technique with applications in many areas, including drug design, protein engineering, macromolecular structure determination, and molecular recognition. This book concentrates on these exciting applications while briefly summarizing the essential mathematical background. Using standard molecular dynamics and related algorithms, results are presented on protein, carbohydrate, and nucleotide modeling and dynamics. Chapters covering relatively new applications, such as simulated annealing protocol and the free energy perturbation method, are also included. Molecular biologists, biochemists, and researchers in structural molecular biology, chemistry, crystallography, and computer modelling will find this book a useful reference resource.

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