title: Methicillin-resistant Staphylococcus aureus (MRSA)-active metabolites from Platanus occidentalis (American Sycamore).
abstract: One known and three new potent, selective, and nontoxic anti-MRSA metabolites, kaempferol 3-O-alpha-l-(2'',3''-di-E-p-coumaroyl)rhamnoside (1) (IC(50) 2.0 microg/mL), kaempferol 3-O-alpha-l-(2''-E-p-coumaroyl-3''-Z-p-coumaroyl)rhamnoside (2) (IC(50) 0.8 microg/mL), kaempferol 3-O-alpha-l-(2''-Z-p-coumaroyl-3''-E-p-coumaroyl)rhamnoside (3) (IC(50) 0.7 microg/mL), and kaempferol 3-O-alpha-l-(2'',3''-di-Z-p-coumaroyl)rhamnoside (4) (IC(50) 0.4 microg/mL), were isolated from the leaves of the common American sycamore, Platanus occidentalis. Compounds 2-4 are new. Due to the unusual selectivity, potency, and safety of the pure compounds and the semipure glycoside mixture against MRSA, it is clear that this represents a viable class of inhibitors to prevent growth of MRSA on surfaces and systemically.
authors.affiliation: Departments of Pharmacognosy, Pharmacology, Chemistry, and Biochemistry and National Center for Natural Products Research, School of Pharmacy, The University of Mississippi, University, Mississippi 38677, USA.
authors.forename: Mohamed A
authors.initials: MA
authors.lastname: Ibrahim
authors.forename: Arsala A
authors.initials: AA
authors.lastname: Mansoor
authors.forename: Amanda
authors.initials: A
authors.lastname: Gross
authors.forename: M Khalid
authors.initials: MK
authors.lastname: Ashfaq
authors.forename: Melissa
authors.initials: M
authors.lastname: Jacob
authors.forename: Shabana I
authors.initials: SI
authors.lastname: Khan
authors.forename: Mark T
authors.initials: MT
authors.lastname: Hamann
mesh_terms: D000900:Anti-Bacterial Agents / Q000737:chemistry / Q000302:isolation & purification / Q000494:pharmacology; D006027:Glycosides / Q000737:chemistry / Q000302:isolation & purification / Q000494:pharmacology; D044949:Kaempferols / Q000737:chemistry / Q000302:isolation & purification / Q000494:pharmacology; D016106:Methicillin Resistance / Q000187:drug effects*; D055624:Methicillin-Resistant Staphylococcus aureus / Q000187:drug effects*; D008826:Microbial Sensitivity Tests; D008922:Mississippi; D015394:Molecular Structure; D013237:Stereoisomerism; D014197:Trees / Q000737:chemistry*
chemical_list: D000900:Anti-Bacterial Agents; D006027:Glycosides; D044949:Kaempferols