Abstract
In the previous paper, we reviewed the origins of energy based calculations, and the early science of FF development. The initial efforts spanning the period from roughly the early 1970s to the mid to late 1990s saw the development of methodologies and philosophies of the derivation of FFs. The use of Cartesian coordinates, derivation of the H-bond potential, different functional forms including diagonal quadratic expressions, coupled valence FFs, functional form of combination rules, and out of plane angles, were all investigated in this period. The use of conformational energetics, vibrational frequencies, crystal structure and energetics, liquid properties, and ab initio data were all described to one degree or another in deriving and validating both the FF functional forms and force constants. Here we discuss the advances made since in improving the rigor and robustness of these initial FFs. The inability of the simple quadratic diagonal FF to accurately describe biomolecular energetics over a large domain of molecular structure, and intermolecular configurations, was pointed out in numerous studies. Two main approaches have been taken to overcome this problem. The first involves the introduction of error functions, either exploiting torsion terms or introducing explicit 2-D error correction grids. The results and remaining challenges of these functional forms is examined. The second approach has been to improve the representation of the physics of intra and intermolecular interactions. The latter involves including descriptions of polarizability, charge flux aka geometry dependent charges, more accurate representations of spatial electron density such as multipole moments, anisotropic nonbond potentials, nonbond and polarization flux, among others. These effects, though not as extensively studied, likely hold the key to achieving the rigorous reproduction of structural and energetic properties long sought in biomolecular simulations, and are surveyed here. In addition, the quality of training and validation observables are evaluated. The necessity of including an ample set of energetic and crystal observables is emphasized, and the inadequacy of free energy as a criterion for FF reliability discussed. Finally, in light of the results of applications of the two approaches to FF development, we propose a “recipe” of terms describing the physics of inter and intramolecular interactions whose inclusion in FFs would significantly improve our understanding of the energetics and dynamics of biomolecular systems resulting from molecular dynamics and other energy based simulations.
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Abbreviations
- AG:
-
Arithmetic–geometric
- Ala:
-
Alanine
- AMBER:
-
Assisted model building with energy refinement
- AMOEBA:
-
Atomic multipole optimized energetics for biomolecular applications
- AUE:
-
Absoluter unsigned error
- BCC:
-
Bond charge correction
- BNS:
-
Ben Naim–Stillinger
- C22:
-
CHARMM22
- CASP:
-
Critical assessment of protein structure prediction
- CFF:
-
Consistent force field
- CHARMM:
-
Chemistry at HARvard Macromolecular Mechanics
- CHELPG:
-
Charges from electrostatic potentials using a grid-based method
- CHEQ:
-
Charge equilibration method
- CMAP:
-
Grid based energy correction map
- CNDO:
-
Complete neglect of differential overlap
- COMPASS:
-
Condensed-phase optimized molecular potentials for atomistic simulation studies
- CVFF:
-
Consistent valence force field
- DFT:
-
Density functional theory
- DMA:
-
Distributed multipole analysis
- DZVP:
-
Valence double-zeta plus polarization
- ECEPP:
-
Empirical conformational energy program for peptides
- EHT:
-
Extended Hückel theory
- ESP:
-
Electrostatic potential
- EVB:
-
Empirical valence bond
- FEP:
-
Free energy perturbation
- FF:
-
Force field
- FQ:
-
Fluctuating charges
- FRET:
-
Forster resonance energy transfer
- GAFF:
-
General AMBER force field
- Gly:
-
Glycine
- GROMOS:
-
GROningen MOlecular Simulation
- hCatL:
-
human Cathepsin L
- HF-SCF:
-
Hartree–Fock self-consistent-field
- Hyp:
-
Hydroxyproline
- IDP:
-
Intrinsically disordered protein
- LCAO:
-
Linear combination of atomic orbitals
- LJ:
-
Lennard-Jones
- LP:
-
Oxygen lone pair
- MC:
-
Monte Carlo
- MCMS FF:
-
Momany, Carruthers, McGuire, and Scheraga force field
- MCY:
-
Matsuoka–Clementi–Yoshimine
- MD:
-
Molecular dynamics
- MDDR:
-
MDL drug data report
- MDL:
-
Molecular Design Limited
- MEP:
-
Molecular electrostatic potentials
- MM:
-
Molecular mechanics
- MMFF:
-
Merck molecular force field
- NMA:
-
N-methylacetamide
- OPLS:
-
Optimized potential for liquid simulations
- OPLS-AA:
-
OPLS all atom
- OPLS-AA:
-
OPLS-AA/L OPLS all atom FF (L for LMP2)
- PCILO:
-
Perturbative configuration interaction using localized orbitals
- PDB:
-
Protein data base
- PEFC:
-
Potential Energy Function Consortium (Biosym)
- PMF:
-
Potential of mean force
- POL3:
-
Polarizable water model (3)
- PPII :
-
Polyproline II conformation
- QCPE:
-
Quantum chemistry program exchange
- QDF:
-
Quantum derivative fitting
- QDP:
-
Charge dependent polarizability
- QM:
-
Quantum mechanics
- RESP:
-
Restrained electrostatic potential
- RMS:
-
Root mean square
- RMSD:
-
Root mean square deviation
- RMSE:
-
Root mean square error
- SAMPL:
-
Statistical assessment of the modeling of proteins and ligands (competition)
- SAXS:
-
Small angle X-ray scattering
- SCF-LCAO-MO:
-
Self-consistent field-linear combination of atomic–molecular orbital
- SDFF:
-
Spectroscopically determined force fields (for macromolecules)
- SIBFA:
-
Sum of interactions between fragments ab initio (computed)
- SPC:
-
Simple point charge (water model)
- ST2:
-
Four point water model replacing Ben-Naim Stillinger (BNS) model
- STO:
-
Slater-type atomic orbitals
- SWM4-NDP:
-
Simple water model with negative Drude polarization
- TIP3P:
-
Transferable intermolecular potential three point
- TTBM:
-
Tri-tert-butylmethane
- TZVP:
-
Triple-zeta plus valence polarization (basis set)
- UB:
-
Urey–Bradley
- UBFF:
-
Urey Bradley force field
- VDW:
-
Van der Waals
- VFF:
-
Valence force field
- WH:
-
Waldman–Hagler
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Acknowledgements
We would like to thank Drs. Mike Gilson, Sam Krimm, Alex MacKerell, Benoit Roux, Pengyu Ren, Jay Ponder, Ken Dill, Kim Palmo, Pnina Dauber-Osguthorpe, for reading parts of manuscript and helpful discussions and Dr. Ruth Sharon for reading and help with editing. We also thank Eitan Hagler for help with the figures, Martha Obermeier for help with proofing and referee 1 who made many helpful suggestions including the addition of the effect of methodology in FF derivation. Special thanks to the editor, Dr. Terry Stouch for his invitation to write this perspective, encouragement, and endless patience.
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Hagler, A.T. Force field development phase II: Relaxation of physics-based criteria… or inclusion of more rigorous physics into the representation of molecular energetics. J Comput Aided Mol Des 33, 205–264 (2019). https://doi.org/10.1007/s10822-018-0134-x
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DOI: https://doi.org/10.1007/s10822-018-0134-x
Keywords
- Force fields
- Force field derivation
- Potential functions
- Van der Waals
- Hydrogen bond
- Drug discovery
- Molecular dynamics
- Molecular mechanics
- Protein simulation
- Molecular simulation
- Nonbond interactions
- Combination rules
- Polarizability
- Charge flux
- Nonbond flux
- Polarizability flux
- Free energy
- Coupling terms
- Cross terms
- AMBER
- CHARMM
- OPLS
- GAFF
- AMOEBA
- SDFF
- CFF
- VFF
- Consistent force field
- Electrostatics
- Multipole moments
- Anisotropic nonbond potentials
- Quantum derivative fitting
- QDF