Symmetry-Restrained Flexible Fitting for Symmetric EM Maps
نویسندگان
چکیده
منابع مشابه
PFfit: Hierarchical Flexible Fitting in 3D EM
We develop a hierarchical solution (PFfit) for fitting an atomic structure to a density map. We use scoring functions that account for steric clashes while maximizing the degree of fit between the protein and the density map, a non-uniform rotationally exhaustive Fourier-based search scheme, and a flexibility model that parametrizes shear and hinge bending motions available to each protein doma...
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MOTIVATION To better analyze low-resolution cryo electron microscopy maps of macromolecular assemblies, component atomic structures frequently have to be flexibly fitted into them. Reaching an optimal fit and preventing the fitting process from getting trapped in local minima can be significantly improved by identifying appropriate rigid bodies (RBs) in the fitted component. RESULTS Here we p...
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Iterative Proportional Fitting (IPF) generates from an input matrix W a sequence of matrices that converges, under certain conditions, to a specific limit matrix Ŵ . This limit is the relative-entropy nearest solution to W among all matrices of prescribed row marginals r and column marginals c. We prove this known fact by a novel strategy that contributes a pure algorithmic intuition. Then we f...
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ژورنال
عنوان ژورنال: Structure
سال: 2011
ISSN: 0969-2126
DOI: 10.1016/j.str.2011.07.017