title: Structure-activity studies of echinomycin antibiotics against drug-resistant and biofilm-forming Staphylococcus aureus and Enterococcus faecalis.
abstract: Four echinomycin antibiotics were isolated from the culture broth of a marine streptomycete, and their structures were determined by a combination of chemical and spectroscopic analyses. Antibiotic activities were measured against drug-resistant and biofilm-forming strains of Staphylococcus aureus and Enterococcus faecalis. Minimum inhibitory concentrations ranging from 0.01 microM to greater than 14 microM clearly defined structure-activity relationships for antibiotic potency. Echinomycin was the most active compound with a MIC of 0.03 microM against methicillin-resistant S. aureus and 0.01 microM against biofilm-forming E. faecalis.
authors.affiliation: Department of Biomedical and Pharmaceutical Sciences, College of Pharmacy, University of Rhode Island, Kingston, RI 02881, USA.
authors.forename: Aaron M
authors.initials: AM
authors.lastname: Socha
authors.forename: Kerry L
authors.initials: KL
authors.lastname: Laplante
authors.forename: David J
authors.initials: DJ
authors.lastname: Russell
authors.forename: David C
authors.initials: DC
authors.lastname: Rowley
mesh_terms: D000900:Anti-Bacterial Agents / Q000737:chemistry* / Q000302:isolation & purification / Q000494:pharmacology; D018441:Biofilms / Q000187:drug effects* / Q000254:growth & development; D024901:Drug Resistance, Multiple, Bacterial / Q000187:drug effects* / Q000502:physiology; D004448:Echinomycin / Q000737:chemistry* / Q000302:isolation & purification / Q000494:pharmacology; D013293:Enterococcus faecalis / Q000187:drug effects* / Q000254:growth & development; D045325:HCT116 Cells; D006801:Humans; D055624:Methicillin-Resistant Staphylococcus aureus / Q000187:drug effects / Q000254:growth & development; D008826:Microbial Sensitivity Tests / Q000379:methods; D021241:Spectrometry, Mass, Electrospray Ionization; D013211:Staphylococcus aureus / Q000187:drug effects* / Q000254:growth & development; D013329:Structure-Activity Relationship
chemical_list: D000900:Anti-Bacterial Agents; D004448:Echinomycin