Discovery and Development of 8-Substituted Cycloberberine Derivatives As Novel Antibacterial Agents Against MRSA
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8-Acetoxycycloberberine () with a unique skeleton was first identified to display a potent activity profile against Gram-positive bacteria, especially methicillin-resistant (MRSA) with minimum inhibitory concentration (MIC) values of 1-8 μg/mL, suggesting a possible novel mechanism of action against bacteria. Taking as the lead, 23 new 8-substituted cycloberberine (CBBR) derivatives including ether, amine, and amide were synthesized and evaluated for their antibacterial effect. The structure-activity relationship revealed that the introduction of a suitable substituent at the 8-position could greatly enhance the potency against MRSA. Among them, compounds and demonstrated equally effective anti-MRSA potency as lead , with an advantage of having a more stable pharmacokinetics feature. A preliminary mechanism study indicated that compound acted upon bacteria partly through catalyzing the cleavage of bacterial DNA. Therefore, we consider that 8-substituted CBBR derivatives constitute a promising class of antibacterial agents in the treatment of MRSA infections.
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