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An Optimized Marinopyrrole A Derivative Targets 6-Phosphoglucosamine Synthetase to Inhibit Methicillin-Resistant
Fusheng Guo1,2, Fan Xiao1, Hao Song3
1Beijing National Laboratory for Molecular Sciences, Key Laboratory of Bioorganic Chemistry and Molecular Engineering of Ministry of Education, College of Chemistry and Molecular Engineering, Peking University, Beijing 100871, China.
Abstract:
Methicillin-resistant Staphylococcus aureus (MRSA) is a common pathogenic bacterium that causes clinical infection and has become one of the most prominent antibiotic-resistant bacteria in the world. There is a pressing need to develop new antibiotics based on novel modes of action to combat increasingly severe MRSA infection. Marinopyrrole A (MA), a natural product extracted from marine Streptomyces in 2008, has a unique bipyrrole chemical skeleton and shows potent antibacterial activity against MRSA. However, its mode of action is still elusive. Herein, we developed an optimized MA derivative, MA-D1, and applied a chemoproteomic approach to reveal that MA-D1 performs its anti-MRSA activity by directly targeting 6-phosphoglucosamine synthetase (GlmS) to cause the breakdown of bacterial cell wall biosynthesis. Computational and experimental studies showed that MA-D1 interacts with the key R381 and E382 residues of GlmS in a novel binding pocket. Furthermore, MA-D1 showed a low resistance frequency for MRSA treatment and was also sensitive against the linezolid-, vancomycin-, or teicoplanin-resistant MRSA strains. MA-D1 also showed in vivo antibiotic efficacy in multiple animal models. This study demonstrates the promising potential of targeting GlmS to develop a new class of antibiotics to control MRSA pathogen infection.
Insights
A novel antibiotic derivative, MA-D1, targets 6-phosphoglucosamine synthetase (GlmS) to combat Methicillin-resistant Staphylococcus aureus (MRSA) by disrupting bacterial cell wall synthesis, offering a promising new treatment strategy.
Area of Science:
- Microbiology
- Natural Products Chemistry
- Drug Discovery
Background:
- Methicillin-resistant Staphylococcus aureus (MRSA) presents a significant global health threat due to widespread antibiotic resistance.
- Existing antibiotics are becoming less effective, necessitating the development of new agents with novel mechanisms of action.
- Marinopyrrole A (MA), a marine natural product, exhibits potent anti-MRSA activity, but its mechanism of action remains unclear.
Purpose of the Study:
- To elucidate the mode of action of Marinopyrrole A (MA) against MRSA.
- To develop and evaluate an optimized MA derivative (MA-D1) as a potential anti-MRSA therapeutic.
- To identify the specific bacterial target of MA-D1.
Main Methods:
- Chemoproteomic profiling to identify the molecular target of MA-D1.
- Computational modeling to analyze the interaction between MA-D1 and its target.
- Experimental validation of MA-D1's mechanism of action and efficacy.
- Assessment of MA-D1's resistance frequency and activity against resistant MRSA strains.
- Evaluation of MA-D1's efficacy in preclinical animal models.
Main Results:
- MA-D1 directly targets and inhibits 6-phosphoglucosamine synthetase (GlmS), a key enzyme in bacterial cell wall biosynthesis.
- MA-D1 binds to a novel pocket within GlmS, interacting with key residues R381 and E382.
- MA-D1 demonstrates low resistance frequency in MRSA and retains activity against strains resistant to established antibiotics.
- MA-D1 exhibits significant antibiotic efficacy in various animal models of MRSA infection.
Conclusions:
- MA-D1 represents a promising new antibiotic candidate for combating MRSA infections.
- Targeting GlmS offers a novel and effective strategy for developing next-generation antibiotics against resistant bacteria.
- The findings pave the way for a new class of antibiotics to address the challenge of MRSA.
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