Share

Coarse-grained Structural Modeling of Molecular Motors

Download Coarse-grained Structural Modeling of Molecular Motors PDF Online Free

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

GET EBOOK


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.

Coarse-grained Structural Modeling of Molecular Motors

Download Coarse-grained Structural Modeling of Molecular Motors PDF Online Free

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

GET EBOOK


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.

Coarse-Grained Molecular Dynamics

Download Coarse-Grained Molecular Dynamics PDF Online Free

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

GET EBOOK


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.

Structurally Resolved Coarse Grained Modeling of Motor Protein Dynamics

Download Structurally Resolved Coarse Grained Modeling of Motor Protein Dynamics PDF Online Free

Author :
Release : 2012
Genre :
Kind : eBook
Book Rating : /5 ( reviews)

GET EBOOK


Book Synopsis Structurally Resolved Coarse Grained Modeling of Motor Protein Dynamics by :

Download or read book Structurally Resolved Coarse Grained Modeling of Motor Protein Dynamics written by . This book was released on 2012. Available in PDF, EPUB and Kindle. Book excerpt:

Fibrous Proteins: Muscle and Molecular Motors

Download Fibrous Proteins: Muscle and Molecular Motors PDF Online Free

Author :
Release : 2005-08-29
Genre : Science
Kind : eBook
Book Rating : 716/5 ( reviews)

GET EBOOK


Book Synopsis Fibrous Proteins: Muscle and Molecular Motors by : John M. Squire

Download or read book Fibrous Proteins: Muscle and Molecular Motors written by John M. Squire. This book was released on 2005-08-29. Available in PDF, EPUB and Kindle. Book excerpt: Molecular Motors and Muscle is the second of a three-part series on Fibrous Proteins. The books are based on a very successful workshop in Alpbach, Austria on the general topic of Fibrous Proteins that gave rise to the award-winning issue of Journal of Structural Biology. There are two major types of protein: Globular proteins which are often enzymes which speed up biochemical reactions and Fibrous proteins which often have more structural roles but can also have dynamic properties. Fibrous proteins are usually either elongated molecules which pack together to form long filaments, as in the case of the intermediate filaments in our hair and skin and as in collagen fibrils in tendons and bones or they are globular proteins which aggregate linearly to form long filaments, such as actin filaments or microtubules. Fibrous proteins act as molecular scaffolds in cells, they can be involved in transport of cell organelles or even on a visible scale as in our muscles. They provide the supporting structures of our skeletons, bones, tendons, cartilage, and skin. They define the mechanical properties of our internal hollow organs such as the intestines, heart, and blood vessels. They are vital for life and represent a fascinating subset of the proteome. Advances in Protein Chemistry is available online on ScienceDirect - full-text online of volumes 53 onwards. Elsevier book series on ScienceDirect gives multiple users throughout an institution simultaneous online access to an important compliment to primary research. Digital delivery ensures users reliable, 24-hour access to the latest peer-reviewed content. The Elsevier book series are compiled and written by the most highly regarded authors in their fields and are selected from across the globe using Elsevier's extensive researcher network. For more information about the Elsevier Book Series on ScienceDirect Program, please visit: http://www.info.sciencedirect.com/bookseries/ *Allows a comparison to be made between unique but related structures. *Quality of the text and illustrations allows ready comprehension of key protein design features. *Identifies fibrous protein sequence features for analysis of the human genome. *Analyzes design principles for fibrous protein sequences thus leading potentially to development of new devices by nanofabrication.

You may also like...