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Reversibly Sampling Conformations and Binding Modes Using Molecular Darting

preprint
submitted on 17.07.2020 and posted on 20.07.2020 by Samuel C. Gill, David Mobley
Sampling multiple binding modes of a ligand in a single molecular dynamics simulation is difficult. A given ligand may have many internal degrees of freedom, along with many different ways it might orient itself a binding site or across several binding sites, all of which might be separated by large energy barriers. We have developed a novel Monte Carlo move called Molecular Darting (MolDarting) to reversibly sample between predefined binding modes of a ligand. Here, we couple this with nonequilibrium candidate Monte Carlo (NCMC) to improve acceptance of moves.
We apply this technique to a simple dipeptide system, a ligand binding to T4 Lysozyme L99A, and ligand binding to HIV integrase in order to test this new method. We observe significant increases in acceptance compared to uniformly sampling the internal, and rotational/translational degrees of freedom in these systems.

Funding

Alchemical free energy methods for efficient drug lead optimization

National Institute of General Medical Sciences

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History

Email Address of Submitting Author

dmobley@uci.edu

Institution

University of California, Irvine

Country

United States

ORCID For Submitting Author

0000-0002-1083-5533

Declaration of Conflict of Interest

\section{Disclosures} DLM is a member of the Scientific Advisory Board of OpenEye Scientific Software and an Open Science Fellow with Silicon Therapeutics.

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