Topologically based multipolar reconstruction of electrostatic interactions in multiscale simulations of proteins

We present a new method to incorporate electrostatic interactions in coarse-grained representations of proteins. The model is based on a topologically reconstructed multipolar expansion of the all-atom centers of charge, specifically of the backbone dipoles and the polar or charged side chains. The reliability of the model is checked by studying different test cases, namely protein−cofactor/substrate interactions, protein large conformational changes, and protein−protein complexes. In all cases, the model quantitatively reproduces the all-atom electrostatic field in both a static and a dynamic framework. The model is of general applicability and can be used to improve both full coarse-grained simulations and hybrid all-atom/coarse-grained multiscale approaches.

Published in:
Journal of Chemical Theory Computation, 4, 8, 1378–1385
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 Record created 2008-11-16, last modified 2018-03-17

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