作者:Serge Michalet、Gilbert Cartier、Bruno David、Anne-Marie Mariotte、Marie-Geneviève Dijoux-franca、Glenn W. Kaatz、Michael Stavri、Simon Gibbons
DOI:10.1016/j.bmcl.2006.12.059
日期:2007.3
As part of an ongoing project to identify plant natural products as efflux pump inhibitors (EPIs), bioassay-guided fractionation of the methanolic extract of Mirabilis jalapa Linn. (Nyetaginaceae) led to the isolation of an active polyphenolic amide: N-trans-feruloyl 4'-O-methyldopamine. This compound showed moderate activity as an EPI against multidrug-resistant (MDR) Staphylococcus aureus overexpressing the multidrug efflux transporter NorA, causing an 8-fold reduction of norfloxacin MIC at 292 mu M (100 mu g/mL). This prompted us to synthesize derivatives in order to provide structure-activity relationships and to access more potent inhibitors. Among the synthetic compounds, some were more active than the natural compound and N-trans-3,4-O-dimethylcaffeoyl tryptamine showed potentiation of norfloxacin in MDR S. aureus comparable to that of the standard reserpine. (c) 2007 Elsevier Ltd. All rights reserved.