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Updated: Jun 28, 2025
Biosynthesis of a Flavonol from a Flavanone by Establishing a One-pot Bienzymatic Cascade
Published on: August 14, 2019
Structure optimizing of flavonoids against both MRSA and VRE
Mei-Zhen Wei1, Yan-Yan Zhu1, Wen-Biao Zu1
1Yunnan Characteristic Plant Extraction Laboratory, Key Laboratory of Medicinal Chemistry for Natural Resource, Ministry of Education and Yunnan Province, School of Chemical Science and Technology, Yunnan University, Kunming, 650500, People's Republic of China.
Novel flavonoid derivative K15 shows potent antibacterial activity against drug-resistant bacteria like Methicillin-resistant Staphylococcus aureus (MRSA) and vancomycin-resistant Enterococci (VRE). K15 effectively combats infections with low toxicity and avoids developing resistance, outperforming current antibiotics.
Area of Science:
- Medicinal Chemistry
- Antimicrobial Research
- Drug Discovery
Background:
- Methicillin-resistant Staphylococcus aureus (MRSA) and vancomycin-resistant Enterococci (VRE) are critical threats causing over 100,000 deaths annually.
- There is an urgent need for novel antibacterial agents to overcome existing resistance mechanisms.
Purpose of the Study:
- To design and synthesize novel flavonoid derivatives with potent antibacterial activity.
- To evaluate the efficacy and safety of these derivatives against MRSA and VRE.
- To elucidate the mechanism of action and resistance profile of the lead compound.
Main Methods:
- Structure-activity relationship (SAR) analysis of 162 flavonoids.
- Design and synthesis of 63 novel flavonoid derivatives.
- Determination of minimum inhibitory concentrations (MICs) against clinical MRSA and VRE isolates.
- In vitro and in vivo efficacy studies in mouse infection models.
- Resistance induction studies and mechanism of action investigations.
Main Results:
- The flavonoid derivative K15 exhibited potent bactericidal activity against MRSA and VRE (MICs = 0.25–1.00 μg/mL).
- K15 demonstrated low toxicity and high membrane selectivity.
- K15 effectively disrupted bacterial biofilm and targeted cell membranes, avoiding resistance development.
- In vivo studies showed K15 superior efficacy in clearing MRSA and VRE infections in mice compared to vancomycin and ampicillin.
Conclusions:
- The novel flavonoid derivative K15 is a promising candidate for treating infections caused by drug-resistant bacteria.
- K15's unique mechanism of action, targeting bacterial membranes and biofilms, circumvents common resistance pathways.
- K15 offers a potential alternative to existing antibiotics with a favorable efficacy and safety profile.
