Release Notes

Version 2020.1

This version adds the following:

  • The SILCS-Hotspots method for identifying all potential ligand binding sites on a protein

  • SilcsBio Graphical User Interface (GUI) support for SILCS-Pharm

  • SilcsBio Graphical User Interface (GUI) support for SILCS-MC Docking and Pose Generation

  • Performance improvements to GCMC-MD

  • CGenFF program and parameters update to version 2.3.0

    CGenFF version 2.3.0 adds explicit parametrization for the following molecules. In prior versions, functional groups in these molecules were accessible through analogy to related functional groups. Now, explicit parametrization and validation yields more accurate treatment and decreases the associated CGenFF penalty scores.

    1H-tetrazole; 5-methyl-1H-tetrazole; 5-ethyl-1H-tetrazole

    2-oxetanone; 3-oxetanone

    ammonium; dimethylammonium; trimethylammonium (Note: Protonated amine parameters were previously based on methylammonium. While the present explicit parametrization of secondary and tertiary amines leads to smaller penalty scores and improvements in performance, electrostatic interactions will continue to be dominated by the +1 monopole.)

    1-butyne; 1-pentyne; 1-hexyne; 1-heptyne; 1-octyne; but-1-ene-3-yne (Note: Alkyne parmeters were previously based on ethene and propene. Extension to longer alkynes and the ene/yne combination validates the parameters and leads to improved treatment of the intramolecular interactions.)

    CGenFF version 2.3.0 also includes improved halogen–protein interactions. Quantum mechanical calculations on chloro- and bromobenzene with model compounds representative of protein functional groups were used as target data to optimize atom-pair specific Lennard-Jones parameters for selected atoms in the model compounds. Application of the parameters in molecular dynamics simulations of eight ligand-protein systems demonstrated systematic improvement in interaction geometries.

as well as bug fixes and stability improvements.

Version 2019.2

This version adds the following:

  • The SILCS-Pharm method for generating 3D receptor-based pharamcophore models from FragMaps in an automated manner

as well as bug fixes and stability improvements.

Version 2019.1

This version adds the following:

  • The SILCS-Pharm method for generating 3D receptor-based pharamcophore models from FragMaps in an automated manner (early access)

as well as bug fixes and stability improvements.

Version 2018.2

This version adds the following:

  • A new Graphical User Interface (GUI) capable of preparing and launching SILCS, SILCS-MC, and SSFEP jobs on remote computing clusters and analyzing and visualizing the job outputs

  • A new CGenFF Parameter Optimizer with functionality for dihedral parameter fitting

as well as bug fixes and stability improvements.

Version 2018.1

This version adds the following:

  • A new Graphical User Interface (GUI) capable of preparing and launching SILCS, SILCS-MC, and SSFEP jobs on remote computing clusters and analyzing and visualizing the job outputs (early access)

  • Improved GPCR and other transmembrane protein support for SILCS

  • Improved GPCR and other transmembrane protein support for SSFEP

  • CGenFF program and parameters update to version 2.2.0

    CGenFF version 2.2.0 extends support to a large variety of drug-like molecules to be used routinely in Computer-Aided Drug design projects. Specifically, 1) it improves treatment of halogen bonds by introducing lone-pairs onto the halogen atoms of aromatic systems. 2) Support is extended to four-membered oxetane, glycolruril, and S-P bond found in GTP-gamma like molecules. 3) Improved predictions with partial charge distributions around ammonium ions and primary amines.

  • A new CGenFF Parameter Optimizer with functionality for dihedral parameter fitting (early access)

as well as bug fixes and stability improvements.

Version 2017.2

This version adds the following:

  • GPCR support for SILCS

  • GPCR support for SSFEP

  • CGENFF program and parameter update to version 2.1.0

    CGenFF version 2.1.0 extends support to S-P bond found in the GTP-gamma like molecules. Bonded parameters and charge-distribution along the S-P bond were modeled using the CHARMM nucleic acid force-field patches for mono- and di-thio substitutions (toppar_all36_na_reactive_rna.str). Three new atom-types have been added to the CGenFF force-field : SG2P1, SG2P2 to support the mono- and di-thio substitutions, along with OG2S1 to model the terminal oxygen connected to the S-P bond.

as well as bug fixes and stability improvements.

Version 2017.1

This version is the initial release. This version includes the following packages:

  • SILCS command line interface

  • SILCS-MC command line interface

  • SSFEP command line interface

  • CGENFF program and parameter version 2.0.0

    CGenFF version 2.0.0 is the second release of CGenFF, extending support to a larger variety of drug-like molecules to be used routinely in Computer-Aided Drug design projects. Specifically, it improves treatment of halogen bonds, by introducing lone-pairs onto the halogen atoms of aromatic systems. Additionally, support is now extended to four-membered oxetane and glycoluril moieties. This is driven largely by improvements in the newly released version 4.0 of CGenFF force field.