title: High-throughput NMR-based screening with competition binding experiments.
abstract: The Achilles heel of ligand-based NMR screening methods is their failure to detect high-affinity ligands and molecules that bind covalently to the receptor. We have developed a novel approach for performing high-throughput screening with NMR spectroscopy that overcomes this limitation. The method also permits detection of potential high-affinity molecules that are only marginally soluble, thus significantly enlarging the diversity of compounds amenable to NMR screening. The techniques developed utilize transverse and/or selective longitudinal relaxation parameters in combination with competition binding experiments. Mathematical expressions are derived for proper setup of the NMR experiments and for extracting an approximate value of the binding constant for the identified ligand from a single-point measurement. With this approach it is possible to screen thousands of compounds in a short period of time against protein or DNA and RNA fragments. The methodology can also be applied for screening plant and fungi extracts.
authors.affiliation: Chemistry Department, Pharmacia, Viale Pasteur 10, 20014 Nerviano (MI), Milan, Italy. claudio.dalvit@pharmacia.com
authors.forename: Claudio
authors.initials: C
authors.lastname: Dalvit
authors.forename: Maria
authors.initials: M
authors.lastname: Flocco
authors.forename: Stefan
authors.initials: S
authors.lastname: Knapp
authors.forename: Marina
authors.initials: M
authors.lastname: Mostardini
authors.forename: Rita
authors.initials: R
authors.lastname: Perego
authors.forename: Brian J
authors.initials: BJ
authors.lastname: Stockman
authors.forename: Marina
authors.initials: M
authors.lastname: Veronesi
authors.forename: Mario
authors.initials: M
authors.lastname: Varasi
mesh_terms: D001667:Binding, Competitive; D004247:DNA / Q000737:chemistry / Q000378:metabolism; D005658:Fungi / Q000737:chemistry / Q000378:metabolism; D006801:Humans; D007700:Kinetics; D019906:Nuclear Magnetic Resonance, Biomolecular / Q000379:methods*; D010936:Plant Extracts / Q000737:chemistry / Q000378:metabolism; D017346:Protein Serine-Threonine Kinases / Q000737:chemistry / Q000378:metabolism; D012313:RNA / Q000737:chemistry / Q000378:metabolism; D012709:Serum Albumin / Q000737:chemistry / Q000378:metabolism; D013816:Thermodynamics
chemical_list: D010936:Plant Extracts; D012709:Serum Albumin; D012313:RNA; D004247:DNA; D017346:Protein Serine-Threonine Kinases