title: Identification of type II and III DDR2 inhibitors.
abstract: Discoidin domain-containing receptors (DDRs) exhibit a unique mechanism of action among the receptor tyrosine kinases (RTKs) because their catalytic activity is induced by extracellular collagen binding. Moreover, they are essential components in the assimilation of extracellular signals. Recently, DDRs were reported to be significantly linked to tumor progression in breast cancer by facilitating the processes of invasion, migration, and metastasis. Here, we report the successful development of a fluorescence-based, direct binding assay for the detection of type II and III DFG-out binders for DDR2. Using sequence alignments and homology modeling, we designed a DDR2 construct appropriate for fluorescent labeling. Successful assay development was validated by sensitive detection of a reference DFG-out binder. Subsequent downscaling led to convenient application to high-throughput screening formats. Screening of a representative compound library identified high-affinity DDR2 ligands validated by orthogonal activity-based assays, and a subset of identified compounds was further investigated with respect to DDR1 inhibition.
authors.affiliation: Department of Chemistry and Chemical Biology, Technical University of Dortmund , Otto-Hahn-Straße 6, 44227 Dortmund, Germany.
authors.forename: André
authors.initials: A
authors.lastname: Richters
authors.forename: Hoang D
authors.initials: HD
authors.lastname: Nguyen
authors.forename: Trang
authors.initials: T
authors.lastname: Phan
authors.forename: Jeffrey R
authors.initials: JR
authors.lastname: Simard
authors.forename: Christian
authors.initials: C
authors.lastname: Grütter
authors.forename: Julian
authors.initials: J
authors.lastname: Engel
authors.forename: Daniel
authors.initials: D
authors.lastname: Rauh
mesh_terms: D000070818:Discoidin Domain Receptors; D015195:Drug Design; D005453:Fluorescence; D057166:High-Throughput Screening Assays; D008024:Ligands; D047428:Protein Kinase Inhibitors / Q000737:chemistry / Q000378:metabolism / Q000494:pharmacology*; D017434:Protein Structure, Tertiary; D020794:Receptor Protein-Tyrosine Kinases / Q000037:antagonists & inhibitors* / Q000737:chemistry / Q000378:metabolism; D011975:Receptors, Mitogen / Q000037:antagonists & inhibitors* / Q000737:chemistry / Q000378:metabolism; D013329:Structure-Activity Relationship
chemical_list: D008024:Ligands; D047428:Protein Kinase Inhibitors; D011975:Receptors, Mitogen; D000070818:Discoidin Domain Receptors; D020794:Receptor Protein-Tyrosine Kinases