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NormalModeRelax relaxes a structures to the coordinate directions derived from Anisotropic Network Model (ANM). The way how it works is: a) generate a extrapolated coordinates, b) put coordinate restraints to that coordinates, and c) run minimization or FastRelax. Current implementation tries multiple normal modes and returns the best scoring one.
<NormalModeRelax name="&string" cartesian="(true &bool)" centroid="(true &false)" scorefxn="('' &string)" nmodes="(5 &Size)" mix_modes="(false &bool)" pertscale="(1.0 &Real)" randomselect="(false &bool)" relaxmode="('min' &string, see below for options)" outsilent="('' &string)" nsample="(nmodes &Size)" cartesian_minimize="(false &bool)" />
This mover can also take an optional MoveMap (see FastRelax documentation for details) to define the residue subset to which it should be applied. MoveMap definition will be useful to control the behavior of heteromolecules during relax or minimization stage. In the absence of the MoveMap, the mover is applied to the whole pose.
See: https://en.wikipedia.org/wiki/Anisotropic_Network_Model Anisotropy of fluctuation dynamics of proteins with an elastic network model, A.R. Atilgan et al., Biophys. J. 80, 505 (2001)