title: A FlashPlate assay for the identification of PARP-1 inhibitors.
abstract: A novel FlashPlate scintillation proximity assay has been developed for the high-throughput screening (HTS) of large compound libraries to identify inhibitors of poly(ADP-ribose) polymerase-1 (PARP-1), an important enzyme involved in DNA repair. The assay was originally developed for the 96-well FlashPlate but is easily transferred to a 384-well format. Moreover, the authors demonstrate that the assay is sufficiently sensitive to determine accurate IC(50) values and adaptable for kinetic evaluation of lead molecules. The mechanism of action of the assay requires the binding of PARP-1 to a double-stranded DNA oligonucleotide leading to the active enzyme. Using NAD(+) and (3)H-NAD(+) as substrate, activated PARP-1 synthesizes labeled poly(ADP-ribose) chains. Once the reaction is stopped, ADP-ribose polymers are brought into proximity with the pretreated FlashPlate walls, resulting in signal amplification. This signal is then detected by a TopCount scintillation plate reader. The developed assay is a robust and reproducible method of screening for PARP-1 inhibitors that is low maintenance and cost-effective and can easily be automated.
authors.affiliation: KuDOS Pharmaceuticals, Cambridge, United Kingdom.
authors.forename: Krystyna J
authors.initials: KJ
authors.lastname: Dillon
authors.forename: Graeme C M
authors.initials: GC
authors.lastname: Smith
authors.forename: Niall M B
authors.initials: NM
authors.lastname: Martin
mesh_terms: D000246:Adenosine Diphosphate Ribose / Q000737:chemistry; D001671:Biochemistry / Q000379:methods*; D002467:Cell Nucleus / Q000378:metabolism; D004305:Dose-Response Relationship, Drug; D015195:Drug Design; D004345:Drug Industry; D004791:Enzyme Inhibitors / Q000494:pharmacology; D006367:HeLa Cells; D006801:Humans; D020128:Inhibitory Concentration 50; D007700:Kinetics; D009243:NAD / Q000737:chemistry; D000067856:Poly(ADP-ribose) Polymerase Inhibitors; D011108:Polymers / Q000737:chemistry
chemical_list: D004791:Enzyme Inhibitors; D000067856:Poly(ADP-ribose) Polymerase Inhibitors; D011108:Polymers; D009243:NAD; D000246:Adenosine Diphosphate Ribose