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Updated: Aug 31, 2025
Subcutaneous Infection of Methicillin Resistant Staphylococcus Aureus MRSA
Published on: February 9, 2011
Cyanidin chloride protects mice from methicillin-resistant Staphylococcus aureus-induced pneumonia by targeting
Xin Su1, Hangqian Yu2, Xingye Wang1
1College of Clinical Medicine, Changchun University of Chinese Medicine, Changchun, China.
Abstract:
Methicillin-resistant Staphylococcus aureus (MRSA) has been developing rapidly in recent years. It poses a severe peril to global health care, and the new strategies to against the MRSA is urgently needed. Sortase A (SrtA) regulates the anchoring of many surface proteins. Compounds repress Staphylococcus aureus (S. aureus) cysteine transpeptidase SrtA are considered adequate potent virulence inhibitors. Then, we describe the identification of an effective SrtA inhibitor, cyanidin chloride, a bioflavonoid compound isolated from various plants. It has a reversible inhibitory effect on SrtA activity at an IC50 of 21.91 μg/mL. As a SrtA inhibitor, cyanidin chloride antagonizes SrtA-related virulence phenotypes due to its breadth and specificity, including fibrinogen adhesion, A549 cell invasion, biofilm formation, and surface protein (SpA) anchoring. Subsequently, molecular docking and fluorescence quenching revealed that SrtA and cyanidin chloride had robust mutual affinity. Further mechanistic studies revealed that Arg-197, Gly-167, and Sep-116 were the key-binding sites mediating the interaction between SrtA and cyanidin chloride. Notably, a significant therapeutic effect of cyanidin chloride in vivo was also observed on the mouse pneumonia model induced by MRSA. In conclusion, our study indicates that cyanidin chloride potentially represents a new candidate SrtA inhibitor for S. aureus and potentially be developed as a new antivirulence agent.
Insights
Cyanidin chloride effectively inhibits Sortase A (SrtA), a key virulence factor in Methicillin-resistant Staphylococcus aureus (MRSA). This plant-derived compound shows therapeutic potential against MRSA infections by blocking bacterial adhesion and invasion.
Area of Science:
- Microbiology
- Biochemistry
- Pharmacology
Background:
- Methicillin-resistant Staphylococcus aureus (MRSA) presents a significant global health threat.
- Sortase A (SrtA) is a crucial enzyme for S. aureus virulence, making it a promising therapeutic target.
- Novel strategies to combat MRSA are urgently needed.
Purpose of the Study:
- To identify and characterize novel inhibitors of Staphylococcus aureus Sortase A (SrtA).
- To evaluate the potential of cyanidin chloride as an anti-virulence agent against MRSA.
Main Methods:
- In vitro enzyme inhibition assays to determine cyanidin chloride's effect on SrtA activity.
- Phenotypic assays assessing SrtA-related virulence factors like adhesion, invasion, and biofilm formation.
- Molecular docking and fluorescence quenching to elucidate binding interactions.
- In vivo efficacy testing using a MRSA-induced mouse pneumonia model.
Main Results:
- Cyanidin chloride demonstrated reversible inhibition of SrtA with an IC50 of 21.91 μg/mL.
- It effectively antagonized SrtA-dependent virulence phenotypes, including reduced bacterial adhesion, cell invasion, biofilm formation, and surface protein anchoring.
- Molecular studies confirmed strong binding affinity between SrtA and cyanidin chloride at specific residues (Arg-197, Gly-167, Sep-116).
- Cyanidin chloride exhibited significant therapeutic effects in a mouse model of MRSA pneumonia.
Conclusions:
- Cyanidin chloride is a potent SrtA inhibitor with broad specificity against S. aureus virulence factors.
- Its demonstrated efficacy in vitro and in vivo suggests potential as a novel anti-virulence agent for treating MRSA infections.
- Further development of cyanidin chloride could lead to new therapeutic strategies against challenging S. aureus strains.
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