title: Synthesis and evaluation of radamide analogues, a chimera of radicicol and geldanamycin.
abstract: Previously, we reported the Hsp90 inhibitory activity of radamide, an open chain amide chimera of geldanamycin and radicicol. Attempts to further expand upon structure-activity relationships for this class of Hsp90 inhibitors led to the preparation of a series of radamide analogues focused on differing tether lengths and quinone mimics. In addition, the cup-shaped conformation adopted by the two natural products when bound to the Hsp90 N-terminal ATP binding pocket suggests that conformationally biased compounds may demonstrate improved binding and inhibition. The preparation and evaluation of radamide analogues with cis/trans alpha,beta-unsaturated amides yielded compounds that exhibit improved antiproliferative activity. In addition, several analogues demonstrated the ability to induce degradation of Hsp90-dependent oncogenic signaling proteins in vitro, a hallmark of Hsp90 N-terminal inhibition.
authors.affiliation: Department of Medicinal Chemistry, The University of Kansas, 1251 Wescoe Hall Drive, Malott Hall 4070, Lawrence, Kansas 66045-7563, USA.
authors.forename: M Kyle
authors.initials: MK
authors.lastname: Hadden
authors.forename: Brian S J
authors.initials: BS
authors.lastname: Blagg
mesh_terms: D000083:Acetanilides / Q000138:chemical synthesis* / Q000737:chemistry; D000251:Adenosine Triphosphatases / Q000037:antagonists & inhibitors; D000970:Antineoplastic Agents / Q000138:chemical synthesis* / Q000494:pharmacology*; D001565:Benzoates / Q000138:chemical synthesis* / Q000737:chemistry; D016227:Benzoquinones / Q000737:chemistry* / Q000494:pharmacology*; D001665:Binding Sites; D001943:Breast Neoplasms / Q000188:drug therapy* / Q000473:pathology*; D045744:Cell Line, Tumor; D049109:Cell Proliferation / Q000187:drug effects; D015195:Drug Design; D005260:Female; D018841:HSP90 Heat-Shock Proteins / Q000037:antagonists & inhibitors; D006801:Humans; D047029:Lactams, Macrocyclic / Q000737:chemistry* / Q000494:pharmacology*; D007783:Lactones; D018942:Macrolides / Q000737:chemistry*; D015394:Molecular Structure; D018719:Erb-b2 Receptor Tyrosine Kinases / Q000037:antagonists & inhibitors / Q000378:metabolism; D013329:Structure-Activity Relationship
chemical_list: D000083:Acetanilides; D000251:Adenosine Triphosphatases; D000970:Antineoplastic Agents; D001565:Benzoates; D016227:Benzoquinones; D018841:HSP90 Heat-Shock Proteins; D047029:Lactams, Macrocyclic; D007783:Lactones; D018942:Macrolides; D018719:Erb-b2 Receptor Tyrosine Kinases; C540759:radamide; C035359:monorden; C001277:geldanamycin