Advanced techniques for constrained internal coordinate molecular dynamics.
Advanced techniques for constrained internal coordinate molecular dynamics.
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DOI:
10.1002/jcc.23200
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发表时间:
2013-04-30
影响因子:
3
通讯作者:
Vaidehi, Nagarajan
中科院分区:
文献类型:
--
作者:
Wagner, Jeffrey R.;Balaraman, Gouthaman S.;Niesen, Michiel J. M.;Larsen, Adrien B.;Jain, Abhinandan;Vaidehi, Nagarajan
关键词:
Internal coordinate molecular dynamics (ICMD) methods provide a more natural description of a protein by using bond, angle and torsional coordinates instead of a Cartesian coordinate representation. Freezing high frequency bonds and angles in the ICMD model gives rise to constrained ICMD (CICMD) models. There are several theoretical aspects that need to be developed in order to make the CICMD method robust and widely usable. In this paper we have designed a new framework for 1) initializing velocities for non-independent CICMD coordinates, 2) efficient computation of center of mass velocity during CICMD simulations, 3) using advanced integrators such as Runge-Kutta, Lobatto and adaptive CVODE for CICMD simulations, and 4) cancelling out the “flying ice cube effect” that sometimes arises in Nosé-Hoover dynamics. The Generalized Newton-Euler Inverse Mass Operator (GNEIMO) method is an implementation of a CICMD method that we have developed to study protein dynamics. GNEIMO allows for a hierarchy of coarse-grained simulation models based on the ability to rigidly constrain any group of atoms. In this paper, we perform tests on the Lobatto and Runge-Kutta integrators to determine optimal simulation parameters. We also implement an adaptive coarse graining tool using the GNEIMO Python interface. This tool enables the secondary structure-guided “freezing and thawing” of degrees of freedom in the molecule on the fly during MD simulations, and is shown to fold four proteins to their native topologies. With these advancements we envision the use of the GNEIMO method in protein structure prediction, structure refinement, and in studying domain motion.
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DOI:
10.1002/prot.340230412
发表时间:
1995-12-01
期刊:
PROTEINS-STRUCTURE FUNCTION AND GENETICS
影响因子:
--
作者:
Frishman, D;Argos, P
通讯作者:
Argos, P
影响因子:
4.1
作者:
Jain, A
通讯作者:
Jain, A
影响因子:
3.3
作者:
Park, In-Hee;Gangupomu, Vamshi;Wagner, Jeffrey;Jain, Abhinandan;Vaidehi, Nagarajan
通讯作者:
Vaidehi, Nagarajan
影响因子:
5.6
作者:
Jones, DT
通讯作者:
Jones, DT
影响因子:
3
作者:
Chen, JH;Im, W;Brooks, CL
通讯作者:
Brooks, CL