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Recently the basic theory of essential dynamics, a method for extracting large concerted motions from protein molecular dynamics trajectories, was described. Here, we introduce and test new aspects. A method for diagonalizing large covariance matrices is presented. We show that it is possible to perform essential dynamics using different subsets of atoms and compare these to the basic C-α analysis. Essential dynamics analyses are also compared to the normal modes method. The stability of the essential space during a simulation is investigated by comparing the two halves of a trajectory. Apart from the analyses in Cartesian space, the essential dynamics in ϕ/ψ torsion angle space is discussed. © 1997 by John Wiley & Sons, Inc.
Aalten et al. (Thu,) studied this question.
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