title: Structure-based design, synthesis, and A-site rRNA cocrystal complexes of functionally novel aminoglycoside antibiotics: C2" ether analogues of paromomycin.
abstract: A series of 2"-O-substituted ether analogues of paromomycin were prepared based on new site-selective functionalizations. X-ray cocrystal complexes of several such analogues revealed a new mode of binding in the A-site rRNA, whereby rings I and II adopted the familiar orientation and position previously observed with paromomycin, but rings III and IV were oriented differently. With few exceptions, all of the new analogues showed potent inhibitory activity equal or better than paromomycin against a sensitive strain of S. aureus. Single digit microM MIC values were obtained against E. coli, with some of the ether appendages containing polar or basic end groups. Two analogues showed excellent survival rate in a mouse septicemia protection assay. Preliminary histopathological analysis of the kidney showed no overt signs of toxicity, while controls with neomycin and kanamycin were toxic at lower doses.
authors: Department of Chemistry, Université de Montréal, C. P. 6128, Succ. Centre-Ville, Montréal, P. Q., Canada. stephen.hanessian@umontreal.ca
authors: Stephen
authors: S
authors: Hanessian
authors: Janek
authors: J
authors: Szychowski
authors: Susanta Sekhar
authors: SS
authors: Adhikari
authors: Guillermo
authors: G
authors: Vasquez
authors: Pachamuthu
authors: P
authors: Kandasamy
authors: Eric E
authors: EE
authors: Swayze
authors: Michael T
authors: MT
authors: Migawa
authors: Ray
authors: R
authors: Ranken
authors: Boris
authors: B
authors: François
authors: Julia
authors: J
authors: Wirmer-Bartoschek
authors: Jiro
authors: J
authors: Kondo
authors: Eric
authors: E
authors: Westhof
mesh_terms: D000818:Animals; D000900:Anti-Bacterial Agents / Q000138:chemical synthesis* / Q000737:chemistry / Q000494:pharmacology; D001665:Binding Sites; D018360:Crystallography, X-Ray; D015195:Drug Design; D004926:Escherichia coli / Q000187:drug effects; D004987:Ethers / Q000138:chemical synthesis / Q000737:chemistry / Q000494:pharmacology; D005260:Female; D051379:Mice; D008807:Mice, Inbred BALB C; D008826:Microbial Sensitivity Tests; D008958:Models, Molecular; D015394:Molecular Structure; D010303:Paromomycin / Q000031:analogs & derivatives* / Q000138:chemical synthesis* / Q000737:chemistry / Q000494:pharmacology; D012335:RNA, Ribosomal / Q000737:chemistry*; D018805:Sepsis / Q000517:prevention & control; D013203:Staphylococcal Infections / Q000517:prevention & control; D013211:Staphylococcus aureus / Q000187:drug effects; D013329:Structure-Activity Relationship
chemical_list: D000900:Anti-Bacterial Agents; D004987:Ethers; D012335:RNA, Ribosomal; D010303:Paromomycin