Journal
JOURNAL OF NATURAL PRODUCTS
Volume 63, Issue 8, Pages 1146-1149Publisher
AMER CHEMICAL SOC
DOI: 10.1021/np990639k
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Funding
- NIGMS NIH HHS [R01 GM54412, GM49631] Funding Source: Medline
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A new method of bioactivity-directed fractionation, based on multidrug resistant pump (MDR) inhibition in Staphylococcus aureus, was demonstrated. This resulted in the isolation, from berberine-containing Berberis species, of two compounds that are themselves devoid of S. aureus antibacterial activity, but that form potent synergistic couples with a subinhibitory concentration of berberine. The bacterial MDR pump inhibitors were identified as the flavonolignan 2 and the porphyrin 3. Another natural flavonolignan, silybin (8) from Silybum marianum, was also shown to be a bacterial MDR pump inhibitor.
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