Please use this identifier to cite or link to this item: doi:10.22028/D291-30525
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Title: Elucidating the energetic contributions to the binding free energy
Author(s): Ahmad, Mazen
Helms, Volkhard
Kalinina, Olga V.
Lengauer, Thomas
Language: English
Title: The journal of chemical physics
Volume: 146
Issue: 1
Startpage: 1
Endpage: 12
Publisher/Platform: American Institute of Physics : AIP
Year of Publication: 2017
Publikation type: Journal Article
Abstract: New exact equations are derived for the terms contributing to the binding free energy (ΔG0) of a ligand-receptor pair using our recently introduced formalism which we here call perturbation-divergence formalism (PDF). Specifically, ΔG0 equals the sum of the average of the perturbation (pertaining to new interactions) and additional dissipative terms. The average of the perturbation includes the sum of the average receptor-ligand interactions and the average of the change of solvation energies upon association. The Kullback-Leibler (KL) divergence quantifies the energetically dissipative terms, which are due to the configurational changes and, using the chain rule of KL divergence, can be decomposed into (i) dissipation due to limiting the external liberation (translation and rotation) of the ligand relative to the receptor and (ii) dissipation due to conformational (internal) changes inside the receptor and the ligand. We also identify all exactly canceling energetic terms which do not contribute to ΔG0. Furthermore, the PDF provides a new approach towards dimensionality reduction in the representation of the association process and towards relating the dynamic (high dimensional) with the thermodynamic (one-dimensional) changes.
DOI of the first publication: 10.1063/1.4973349
URL of the first publication: https://aip.scitation.org/doi/10.1063/1.4973349
Link to this record: hdl:20.500.11880/28908
http://dx.doi.org/10.22028/D291-30525
ISSN: 0021-9606
1089-7690
Date of registration: 23-Mar-2020
Faculty: NT - Naturwissenschaftlich- Technische Fakultät
Department: NT - Biowissenschaften
Professorship: NT - Prof. Dr. Volkhard Helms
Collections:UniBib – Die Universitätsbibliographie

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