title: Bioinformatic discovery of novel bioactive peptides.
abstract: Short synthetic oligopeptides based on regions of human proteins that encompass functional motifs are versatile reagents for understanding protein signaling and interactions. They can either mimic or inhibit the parent protein's activity and have been used in drug development. Peptide studies typically either derive peptides from a single identified protein or (at the other extreme) screen random combinatorial peptides, often without knowledge of the signaling pathways targeted. Our objective was to determine whether rational bioinformatic design of oligopeptides specifically targeted to potentially signaling-rich juxtamembrane regions could identify modulators of human platelet function. High-throughput in vitro platelet function assays of palmitylated cell-permeable oligopeptides corresponding to these regions identified many agonists and antagonists of platelet function. Many bioactive peptides were from adhesion molecules, including a specific CD226-derived inhibitor of inside-out platelet signaling. Systematic screens of this nature are highly efficient tools for discovering short signaling motifs in molecular signaling pathways.
authors.affiliation: Department of Clinical Pharmacology, Royal College of Surgeons in Ireland, 123 St. Stephen's Green, Dublin 2, Ireland.
authors.forename: Richard J
authors.initials: RJ
authors.lastname: Edwards
authors.forename: Niamh
authors.initials: N
authors.lastname: Moran
authors.forename: Marc
authors.initials: M
authors.lastname: Devocelle
authors.forename: Aoife
authors.initials: A
authors.lastname: Kiernan
authors.forename: Gerardene
authors.initials: G
authors.lastname: Meade
authors.forename: William
authors.initials: W
authors.lastname: Signac
authors.forename: Martina
authors.initials: M
authors.lastname: Foy
authors.forename: Stephen D E
authors.initials: SD
authors.lastname: Park
authors.forename: Eimear
authors.initials: E
authors.lastname: Dunne
authors.forename: Dermot
authors.initials: D
authors.lastname: Kenny
authors.forename: Denis C
authors.initials: DC
authors.lastname: Shields
mesh_terms: D000244:Adenosine Diphosphate / Q000378:metabolism; D000595:Amino Acid Sequence; D000945:Antigens, Differentiation, T-Lymphocyte / Q000235:genetics / Q000378:metabolism; D001792:Blood Platelets / Q000187:drug effects / Q000378:metabolism; D015815:Cell Adhesion Molecules / Q000235:genetics; D016000:Cluster Analysis; D019295:Computational Biology / Q000379:methods*; D004353:Drug Evaluation, Preclinical; D006801:Humans; D008565:Membrane Proteins / Q000235:genetics; D018716:Molecular Mimicry / Q000235:genetics; D009842:Oligopeptides / Q000737:chemistry / Q000235:genetics / Q000494:pharmacology*; D019308:Palmitic Acid / Q000737:chemistry; D010446:Peptide Fragments / Q000235:genetics / Q000494:pharmacology; D015539:Platelet Activation / Q000187:drug effects*; D010974:Platelet Aggregation / Q000187:drug effects; D010975:Platelet Aggregation Inhibitors / Q000737:chemistry / Q000494:pharmacology; D019039:Platelet Glycoprotein GPIIb-IIIa Complex / Q000378:metabolism; D000098862:T Lineage-Specific Activation Antigen 1
chemical_list: D000945:Antigens, Differentiation, T-Lymphocyte; D000098862:T Lineage-Specific Activation Antigen 1; D015815:Cell Adhesion Molecules; D008565:Membrane Proteins; D009842:Oligopeptides; D010446:Peptide Fragments; D010975:Platelet Aggregation Inhibitors; D019039:Platelet Glycoprotein GPIIb-IIIa Complex; C086309:thrombin receptor peptide SFLLRNP; D019308:Palmitic Acid; D000244:Adenosine Diphosphate