Heterogeneous Path Ensembles for Conformational Transitions in Semiatomistic Models of Adenylate Kinase

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Abstract
We performed “weighted ensemble” path-sampling simulations of adenylate kinase, using several semiatomistic protein models. The models have an all-atom backbone with various levels of residue interactions. The primary result is that full statistically rigorous path sampling required only a few weeks of single-processor computing time with these models, indicating the addition of further chemical detail should be readily feasible. Our semiatomistic path ensembles are consistent with previous biophysical findings: the presence of two distinct pathways, identification of intermediates, and symmetry of forward and reverse pathways.

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