A BAGIM/SAGIM joint production.
Thursday, April 15, 2021
4:30 pm PT (UTC-7)
7:30 pm ET (UTC-4)
Sifting through poses: Applying crystal-based conformational health assessments in ligand docking
Doree Sitkoff, Principal Scientist in Computational Chemistry, Discovery Chemistry, Janssen Research and Development
Molecular docking is a primary computational chemistry tool for hypothesizing how organic ligands bind to macromolecular receptor sites. For a variety of reasons, however, docking software packages can sometimes suggest binding models in which the ligand is conformationally strained. A rapid and reliable way to identify such poses would provide added context when assessing docking results. Here, we calculate a ligand geometry fitness score which coarsely estimates the torsional health of a docked pose, as a supplement to the calculated docking score. The geometry fitness score is based on the Mogul knowledge base of molecular conformations derived from the Cambridge Structural Database (CSD). Applications of the added geometrical score in examining preferred binding poses, and in virtual screening are discussed.
Sifting through the PDB: Would you prefer a diamond or coprolite for that engagement ring?
Gregory Warren, Director of Computational Chemistry, DeepCure
Historically computational chemists have paid little attention to the metrics of X-ray and neutron diffraction crystal structures outside resolution. While resolution is a useful (easily obtained) metric it is not sufficient. This presentation will discuss metrics that are more applicable for assessing the quality and/or reliability of structures prior to selection for use. Data showing how structure choice affects docking and ligand strain estimates will be presented.
Structural databases in drug discovery: extracting useful information from the CSD and the PDB
Vera Prytkova, Research and Applications Scientist, CCDC
Knowledge of molecular conformation and interactions derived from small-molecule and protein structures can have significant impact in drug discovery. Structural databases can be mined to identify patterns of interaction or potential scaffold hops to design novel motifs and retrieve a diversity of ligand topologies. Statistically significant information about molecular conformations and intermolecular interactions can help a researcher evaluate the probability of observing a particular conformation of a newly designed drug in the binding site. At last, conformational analysis of a potential drug candidate allows to perform the stability analysis for solid form development. In this presentation specific aspects and examples of insights derived from structural databases useful for drug discovery efforts will be presented.