title: The identification of novel PLC-gamma inhibitors using virtual high throughput screening.
abstract: Phospholipase C-gamma (PLC-gamma) has been identified as a possible biological target for anticancer drug therapy but suitable inhibitors are lacking. Therefore, in order to identify active compounds (hits) virtual high throughput screening was performed. The crystal structure of the PLC-delta isoform was used as a model docking scaffold since no crystallographic data are available on its gamma counterpart. A pilot screen was performed using approximately 9.2x10(4) compounds, where the robustness of the methodology was tested. This was followed by the main screening effort where approximately 4.4x10(5) compounds were used. In both cases, plausible compounds were identified (virtual hits) and a selection of these was experimentally tested. The most potent compounds were in the single digit micro-molar range as determined from the biochemical (Flashplate) assay. This translated into approximately 15 microM in a functional assay in cells. About 30% of the virtual hits showed activity against PLC-gamma (IC(50)<50 microM).
authors.affiliation: Cancer Research UK Centre for Cancer Therapeutics, The Institute of Cancer Research, 15 Cotswold Road, Sutton, Surrey SM2 5NG, UK. j.reynisson@auckland.ac.nz
authors.forename: Jóhannes
authors.initials: J
authors.lastname: Reynisson
authors.forename: William
authors.initials: W
authors.lastname: Court
authors.forename: Ciaran
authors.initials: C
authors.lastname: O'Neill
authors.forename: James
authors.initials: J
authors.lastname: Day
authors.forename: Lisa
authors.initials: L
authors.lastname: Patterson
authors.forename: Edward
authors.initials: E
authors.lastname: McDonald
authors.forename: Paul
authors.initials: P
authors.lastname: Workman
authors.forename: Matilda
authors.initials: M
authors.lastname: Katan
authors.forename: Suzanne A
authors.initials: SA
authors.lastname: Eccles
mesh_terms: D000595:Amino Acid Sequence; D045744:Cell Line, Tumor; D020650:Combinatorial Chemistry Techniques / Q000379:methods; D015195:Drug Design; D004353:Drug Evaluation, Preclinical / Q000379:methods; D004791:Enzyme Inhibitors / Q000737:chemistry* / Q000494:pharmacology; D006801:Humans; D020128:Inhibitory Concentration 50; D015394:Molecular Structure; D051966:Phospholipase C gamma / Q000037:antagonists & inhibitors*; D013329:Structure-Activity Relationship; D013379:Substrate Specificity
chemical_list: D004791:Enzyme Inhibitors; D051966:Phospholipase C gamma