title: Structure-activity studies of phosphorylated peptide inhibitors of the association of phosphatidylinositol 3-kinase with PDGF-beta receptor.
abstract: Phosphorylated pentapeptides derived from Tyr751 of the PDGF-beta receptor (pTyr751-Val-Pro-Met-Leu, pTyr = phosphotyrosine) were prepared to examine their ability to inhibit the association of the C-terminal SH2 domain of the p85 subunit of phosphatidylinositol 3-kinase (PI 3-kinase) with the PDGF-beta receptor. Peptidic analogs were prepared to examine the importance of the amine and carboxy terminus and specific amino acids via alanine/D-amino acid scans and site specific modifications. Several of these peptides had submicromolar activity. In particular, it was shown that neutralization of the amine and carboxy terminus led to analogs with enhanced activity. In addition, it was determined that only minimal modifications were allowed for pTyr and Met, while the other positions were quite tolerant of modification.
authors.affiliation: Department of Chemistry, Parke-Davis Pharmaceutical Research, Division of Warner-Lambert Company, Ann Arbor, MI 48105, USA.
authors.forename: K
authors.initials: K
authors.lastname: Ramalingam
authors.forename: S R
authors.initials: SR
authors.lastname: Eaton
authors.forename: W L
authors.initials: WL
authors.lastname: Cody
authors.forename: G H
authors.initials: GH
authors.lastname: Lu
authors.forename: R L
authors.initials: RL
authors.lastname: Panek
authors.forename: L A
authors.initials: LA
authors.lastname: Waite
authors.forename: S J
authors.initials: SJ
authors.lastname: Decker
authors.forename: J A
authors.initials: JA
authors.lastname: Keiser
authors.forename: A M
authors.initials: AM
authors.lastname: Doherty
mesh_terms: D000409:Alanine / Q000032:analysis; D000595:Amino Acid Sequence; D000596:Amino Acids / Q000032:analysis; D001665:Binding Sites; D004791:Enzyme Inhibitors / Q000138:chemical synthesis / Q000494:pharmacology; D008969:Molecular Sequence Data; D009842:Oligopeptides / Q000138:chemical synthesis / Q000494:pharmacology; D019869:Phosphatidylinositol 3-Kinases; D010748:Phosphopeptides / Q000138:chemical synthesis* / Q000494:pharmacology*; D010766:Phosphorylation; D017853:Phosphotransferases (Alcohol Group Acceptor) / Q000037:antagonists & inhibitors / Q000378:metabolism*; D020797:Receptor, Platelet-Derived Growth Factor beta; D017479:Receptors, Platelet-Derived Growth Factor / Q000037:antagonists & inhibitors / Q000378:metabolism*; D013329:Structure-Activity Relationship
chemical_list: D000596:Amino Acids; D004791:Enzyme Inhibitors; D009842:Oligopeptides; D010748:Phosphopeptides; D019869:Phosphatidylinositol 3-Kinases; D017853:Phosphotransferases (Alcohol Group Acceptor); D020797:Receptor, Platelet-Derived Growth Factor beta; D017479:Receptors, Platelet-Derived Growth Factor; D000409:Alanine