title: Biopanning and rapid analysis of selective interactive ligands.
abstract: Here we introduce a new approach for the screening, selection and sorting of cell-surface-binding peptides from phage libraries. Biopanning and rapid analysis of selective interactive ligands (termed BRASIL) is based on differential centrifugation in which a cell suspension incubated with phage in an aqueous upper phase is centrifuged through a non-miscible organic lower phase. This single-step organic phase separation is faster, more sensitive and more specific than current methods that rely on washing steps or limiting dilution. As a proof-of-principle, we screened human endothelial cells stimulated with vascular endothelial growth factor (VEGF) and constructed a peptide-based ligand-receptor map of the VEGF family. Next, we validated the motif PQPRPL as a novel chimeric ligand mimic that binds specifically to VEGF receptor-1 and to neuropilin-1. BRASIL may prove itself a superior method for probing target cell surfaces with a broad range of potential applications.
authors.affiliation: The University of Texas M.D. Anderson Cancer Center, Houston, Texas, USA.
authors.forename: R J
authors.initials: RJ
authors.lastname: Giordano
authors.forename: M
authors.initials: M
authors.lastname: Cardó-Vila
authors.forename: J
authors.initials: J
authors.lastname: Lahdenranta
authors.forename: R
authors.initials: R
authors.lastname: Pasqualini
authors.forename: W
authors.initials: W
authors.lastname: Arap
mesh_terms: D020816:Amino Acid Motifs; D000595:Amino Acid Sequence; D002462:Cell Membrane / Q000378:metabolism*; D002478:Cells, Cultured; D016228:Endothelial Growth Factors / Q000378:metabolism / Q000494:pharmacology; D004730:Endothelium, Vascular / Q000378:metabolism; D006801:Humans; D008024:Ligands; D008222:Lymphokines / Q000378:metabolism / Q000494:pharmacology; D008969:Molecular Sequence Data; D009419:Nerve Tissue Proteins / Q000378:metabolism; D039942:Neuropilin-1; D019151:Peptide Library; D010455:Peptides / Q000737:chemistry / Q000378:metabolism; D020794:Receptor Protein-Tyrosine Kinases / Q000378:metabolism; D017978:Receptors, Growth Factor / Q000378:metabolism; D040262:Receptors, Vascular Endothelial Growth Factor; D011993:Recombinant Fusion Proteins / Q000737:chemistry / Q000378:metabolism; D042461:Vascular Endothelial Growth Factor A; D042442:Vascular Endothelial Growth Factors
chemical_list: D016228:Endothelial Growth Factors; D008024:Ligands; D008222:Lymphokines; D009419:Nerve Tissue Proteins; D019151:Peptide Library; D010455:Peptides; D017978:Receptors, Growth Factor; D011993:Recombinant Fusion Proteins; D042461:Vascular Endothelial Growth Factor A; D042442:Vascular Endothelial Growth Factors; D039942:Neuropilin-1; D020794:Receptor Protein-Tyrosine Kinases; D040262:Receptors, Vascular Endothelial Growth Factor