Calculating the binding free energies of charged species based on explicit-solvent simulations employing lattice-sum methods: An accurate correction scheme for electrostatic finite-size effects
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The calculation of a protein-ligand binding free energy based on molecular dynamics (MD) simulations generally relies on a thermodynamic cycle in which the ligand is alchemically inserted into the system, both in the solvated protein and free in solution. The corresponding ligand-insertion free energies are typically calculated in nanoscale computational boxes simulated under periodic boundary conditions and considering electrostatic interactions defined by a periodic lattice-sum. This is distinct from the ideal bulk situation of a system of macroscopic size simulated under non-periodic boundary conditions with Coulombic electrostatic interactions. This discrepancy results in finite-size effects, which affect primarily the charging component of the insertion free energy, are dependent on the box size, and can be large when the ligand bears a net charge, especially if the protein is charged as well. This article investigates finite-size effects on calculated charging free energies using as a test case the binding of the ligand 2-amino-5-methylthiazole (net charge +1 e) to a mutant form of yeast cytochrome c peroxidase in water. Considering different charge isoforms of the protein (net charges −5, 0, +3, or +9 e), either in the absence or the presence of neutralizing counter-ions, and sizes of the cubic computational box (edges ranging from 7.42 to 11.02 nm), the potentially large magnitude of finite-size effects on the raw charging free energies (up to 17.1 kJ mol−1) is demonstrated. Two correction schemes are then proposed to eliminate these effects, a numerical and an analytical one. Both schemes are based on a continuum-electrostatics analysis and require performing Poisson-Boltzmann (PB) calculations on the protein-ligand system. While the numerical scheme requires PB calculations under both non-periodic and periodic boundary conditions, the latter at the box size considered in the MD simulations, the analytical scheme only requires three non-periodic PB calculations for a given system, its dependence on the box size being analytical. The latter scheme also provides insight into the physical origin of the finite-size effects. These two schemes also encompass a correction for discrete solvent effects that persists even in the limit of infinite box sizes. Application of either scheme essentially eliminates the size dependence of the corrected charging free energies (maximal deviation of 1.5 kJ mol−1). Because it is simple to apply, the analytical correction scheme offers a general solution to the problem of finite-size effects in free-energy calculations involving charged solutes, as encountered in calculations concerning, e.g., protein-ligand binding, biomolecular association, residue mutation, pKa and redox potential estimation, substrate transformation, solvation, and solvent-solvent partitioning.
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A post-alchemical correction was applied to the ΔΔG results.
“A routine λD simulation was performed and then a post-alchemical correction141 was applied to the ΔΔG results (Eq. 1).”
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- Authors
- Rocklin, G. J., Mobley, D. L., Dill, K. A., & Hünenberger, P. H.
- Affiliations
- University of California, San Francisco (US)
- LSU New Orleans (US)
- Stony Brook University (US)
- ETH Zurich (CH)
- Venue
- The Journal of Chemical Physics
- Publisher
- AIP Publishing
- Published
- 2013-11-08
- Volume
- 139
- Issue
- 18
- Pages
- 184103-184103
- ISSN
- 0021-9606 (ISSN-L)
- 1089-7690
- PMC
- PMC3838431
- OpenAlex
- W1978393297
- Cited by
- 234
- References
- 0
- Citations by year
- 2026: 15 · 2025: 13 · 2024: 21 · 2023: 15 · 2022: 28 · 2021: 21 · 2020: 25 · 2019: 8 · 2018: 31 · 2017: 21 · 2016: 15 · 2015: 4 · 2014: 14 · 2013: 3
- FWCI
- 5.38
- Type
- journal article
- Language
- en
- Open access
- bronze
- doi.org
- Locations
- The Journal of Chemical Physics (publishedVersion)
- Europe PMC (PubMed Central) (publishedVersion)
- PubMed Central (publishedVersion)
- PubMed (publishedVersion)
- eScholarship (California Digital Library) (submittedVersion)
- Funders
- National Science Foundation (1003897)
- U.S. Department of Defense
- Louisiana Board of Regents (EPS-1003897)
- Schweizerischer Nationalfonds zur Förderung der Wissenschaftlichen Forschung (132739, 138020)
- National Institutes of Health (1r15gm096257-01a1)
- National Institute of General Medical Sciences (1R15GM096257-01A1, R15 GM096257)
- Topics
- Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Protein Structure and Dynamics
- Physical Sciences › Physics and Astronomy › Atomic and Molecular Physics, and Optics › Advanced Chemical Physics Studies
- Physical Sciences › Chemistry › Physical and Theoretical Chemistry › Advanced Physical and Chemical Molecular Interactions
- Keywords
- protein-ligand binding free energy, finite-size effects, electrostatics, periodic boundary conditions, non-periodic boundary conditions, Poisson-Boltzmann equation, charged solutes, cytochrome c peroxidase, counterions, explicit solvent, continuum electrostatics
- MeSH terms
- Cytochrome-c Peroxidase, Ligands, Mutation, Saccharomyces cerevisiae, Solvents, Thermodynamics, Thiazoles, Water, Static Electricity, Molecular Dynamics Simulation
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