Predicting small-molecule solvation free energies: an informal blind test for computational chemistry.
Experimental data on the transfer of small molecules between vacuum and water are relatively sparse. This makes it difficult to assess whether computational methods are truly predictive of this important quantity or merely good at explaining what has been seen. To explore this, a prospective test was performed of two different methods for estimating solvation free energies: an implicit solvent approach based on the Poisson-Boltzmann equation and an explicit solvent approach using alchemical free energy calculations. For a set of 17 small molecules, root mean square errors from experiment were between 1.3 and 2.6 kcal/mol, with the explicit solvent free energy approach yielding somewhat greater accuracy but at greater computational expense. Insights from outliers and suggestions for future prospective challenges of this kind are presented.
Nicholls
Anthony
A
OpenEye Scientific Software, Inc., Santa Fe, New Mexico 87508,USA. anthony@eyesopen.com
Mobley
David L
DL
Guthrie
J Peter
JP
Chodera
John D
JD
Bayly
Christopher I
CI
Cooper
Matthew D
MD
Pande
Vijay S
VS
D055598:Chemical Phenomena; D002627:Chemistry, Physical; D008956:Models, Chemical; D008958:Models, Molecular; D004364:Pharmaceutical Preparations / Q000737:chemistry*; D012997:Solvents / Q000737:chemistry*; D013816:Thermodynamics
D004364:Pharmaceutical Preparations; D012997:Solvents