title: Peptides and pseudopeptides incorporating D-Phe-Pro-Arg and Arg-Gly-Asp lead sequences as potential antithrombotic agents.
abstract: Peptide leads D-Phe-Pro-Arg for thrombin inhibition and Arg-Gly-Asp for antagonistic activity on fibrinogen receptor were combined in one molecule in order to produce compounds capable of acting both as thrombin inhibitors and as fibrinogen receptor antagonists. Peptide conjugate 7 possessing both leads joined by a tetraglycine linker as well as tripeptides and peptidomimetics with highly overlapped D-Phe-Pro-Arg and Arg-Gly-Asp pharmacophore groups were prepared. Conjugate 7 was found to possess antagonistic activity on fibrinogen receptor, but was unexpectedly inactive as thrombin inhibitor. Compound 9 comprising of highly integrated D-Phe-Pro-Arg and Arg-Gly-Asp pharmacophore groups was found to possess a moderate but well balanced thrombin inhibitory and fibrinogen receptor antagonistic activity.
authors.affiliation: Faculty of Pharmacy, University of Ljubljana, Askerceva 7, SI-1000 Ljubljana, Slovenia.
authors.forename: Janez
authors.initials: J
authors.lastname: Ilas
authors.forename: Ferenc
authors.initials: F
authors.lastname: Hudecz
authors.forename: Helga
authors.initials: H
authors.lastname: Süli-Vargha
authors.forename: Danijel
authors.initials: D
authors.lastname: Kikelj
mesh_terms: D000595:Amino Acid Sequence; D000925:Anticoagulants / Q000138:chemical synthesis / Q000737:chemistry / Q000494:pharmacology*; D001665:Binding Sites; D015195:Drug Design; D004791:Enzyme Inhibitors / Q000138:chemical synthesis / Q000737:chemistry / Q000494:pharmacology*; D005340:Fibrinogen / Q000037:antagonists & inhibitors / Q000737:chemistry; D006801:Humans; D008297:Male; D008958:Models, Molecular; D008969:Molecular Sequence Data; D015394:Molecular Structure; D009842:Oligopeptides / Q000737:chemistry*; D010455:Peptides / Q000138:chemical synthesis / Q000737:chemistry / Q000494:pharmacology*; D010974:Platelet Aggregation / Q000187:drug effects; D039341:Receptors, Fibrinogen / Q000037:antagonists & inhibitors / Q000737:chemistry; D013237:Stereoisomerism; D013329:Structure-Activity Relationship; D013917:Thrombin / Q000037:antagonists & inhibitors* / Q000737:chemistry
chemical_list: D000925:Anticoagulants; D004791:Enzyme Inhibitors; D009842:Oligopeptides; D010455:Peptides; D039341:Receptors, Fibrinogen; C047981:arginyl-glycyl-aspartic acid; C077952:phenylalanyl-prolyl-arginine; D005340:Fibrinogen; D013917:Thrombin