TransAtlas:
Atlas of Protein Conformational Transitions
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About TransAtlas
TransAtlas is part of the Integrated Platform for macromolecular flexibility: FlexPortal, developed in the Spanish National Institute of Bioinformatics (INB), the Institute for Research in Biomedicine (IRB Barcelona) and the Molecular Modeling and Bioinformatics group (MMB).
Related Molecular Modeling and Bioinformatics Group Servers:
MDdMD and GOdMD are new methods for determining pathways for conformational transitions in macromolecules based on the use of discrete molecular dynamics and biasing techniques based on a combination of essential dynamics and Maxwell-Demon sampling techniques. The methods can work with high efficiency at different levels of resolution, including the atomistic one, and can help to define initial pathways for further exploration by means of more accurate atomistic molecular dynamics simulations.
MoDEL, Molecular Dynamics Extended Library: more than 1700 trajectories of proteins representative of monomeric soluble structures in the protein data bank (PDB) have been obtained by means of state-of-the-art atomistic molecular dynamics simulations in near-physiological conditions. The trajectories and analyses are stored in a large data warehouse, which can be queried for dynamic information on proteins, including interactions. Here, we describe the project and the structure and contents of our database, and provide examples of how it can be used to describe the global flexibility properties of proteins. Basic analyses and trajectories stripped of solvent molecules at a reduced resolution level are available from our web server.
FlexServ is a web-based tool for the analysis of protein flexibility. The server incorporates powerful protocols for the coarse-grained determination of protein dynamics using different versions of Normal Mode Analysis (NMA), Brownian dynamics (BD) and Discrete Dynamics (DMD). It can also analyze user provided trajectories. The server allows a complete analysis of flexibility using a large variety of metrics, including basic geometrical analysis, B-factors, essential dynamics, stiffness analysis, collectivity measures, Lindemann's indexes, residue correlation, chain-correlations, dynamic domain determination, hinge point detections, etc. Data is presented through a web interface as plain text, 2D and 3D graphics.
MDWeb and MDMoby constitute a web-based platform to help access to molecular dynamics (MD) in the standard and high-throughput regime. The platform provides tools to prepare systems from PDB structures mimicking the procedures followed by human experts. It provides inputs and can send simulations for three of the most popular MD packages (Amber, NAMD and Gromacs). Tools for analysis of trajectories, either provided by the user or retrieved from our MoDEL database (https://mmb.irbbarcelona.org/MoDEL) are also incorporated. The platform has two ways of access, a set of web-services based on the BioMoby framework (MDMoby), programmatically accessible and a web portal (MDWeb).
NAFlex is a web-tool for the analysis of flexibility of nucleic acids, both isolated and protein-bound. NAFlex allows the user to incorporate structures from the Protein Data Bank, filling gaps and removing structural inconsistencies if any. It also allows to build canonical (average or sequence-adapted) nucleic acid structures using a variety of predefined internal libraries and to create specific nucleic acids conformations. NAFlex: Nucleic Acids Flexibility NAFlex offers a variety of methods to explore nucleic acids flexibility, from a colour-less worm-like chain model to a base-pair resolution elastic model of flexibility and even atomistic molecular dynamics (MD) simulation. Within the MD-framework NAFlex uses the MDWeb platform to perform all the set-up of the simulation (structural validation and correction, solvation, minimization, thermalization, pre-equilibration, and equilibration) following well-tested procedures. Simulations can be prepared to launch GROMACS, NAMD or AMBER calculations with any of the commonly used force-fields and solvent models. Trajectories, obtained either in situ or provided by the user, can be visualized and analyzed using a large number of tools, including helical analysis, principal component analysis, local and global stiffness, energy decomposition and NMR-observable predictions. The website is free and open to all users and there are no login requirements.
BigNASim, Big Data Nucleic Acids Simulations Database: Molecular dynamics simulation (MD) is, just behind genomics, the bioinformatics tool that generates the largest amounts of data, and that is using the largest amount of CPU time in supercomputing centres. MD trajectories are obtained after months of calculations, analysed in situ, and in practice forgotten. Several projects to generate stable trajectory databases have been developed for proteins, but no equivalence exists in the nucleic acids world. We present here a novel database system to store MD trajectories and analyses of nucleic acids. The initial data set available consists mainly of the benchmark of the new molecular dynamics force-field, parmBSC1. It contains 156 simulations, with over 120 μs of total simulation time. The database is based on the combination of two NoSQL engines, Cassandra for storing trajectories and MongoDB to store analysis results and simulation metadata. The analyses available include backbone geometries, helical analysis, NMR observables and a variety of mechanical analyses. Individual trajectories and combined meta-trajectories can be downloaded from the portal.