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Updated: May 8, 2026
Biosensor for Detection of Antibiotic Resistant Staphylococcus Bacteria
Published on: May 8, 2013
Antimicrobial and antibiofilm activity of highly soluble polypyrrole against methicillin-resistant Staphylococcus
Danillo Sales Rosa1, Samily Aquino de Sá Oliveira1, Renata de Faria Silva Souza1
1Universidade Federal do Vale do São Francisco, Petrolina, Pernambuco 56300-000, Brazil.
Aims:
The purpose was to evaluate the antimicrobial activity of highly soluble polypyrrole (Hs-PPy), alone or combined with oxacillin, as well as its antibiofilm potential against methicillin-resistant Staphylococcus aureus strains. Furthermore, the in silico inhibitory mechanism in efflux pumps was also investigated.
Methods And Results:
Ten clinical isolates of methicillin-resistant Staphylococcus aureus (MRSA) and two reference strains were used. Antimicrobial activity was determined by broth microdilution, and the combination effect with oxacillin was evaluated by the checkerboard assay. The biofilm formation capacity of MRSA and the interference of Hs-PPy were evaluated. The inhibitory action of Hs-PPy on the efflux pump was evaluated in silico through molecular docking. Hs-PPy showed activity against the isolates, with inhibitory action between 62.5 and 125 µg ml-1 and bactericidal action at 62.5 µg ml-1, as well as synergism in association with oxacillin. The isolates ranged from moderate to strong biofilm producers, and Hs-PPy interfered with the formation of this structure, but not with mature biofilm. There was no in silico interaction with the efflux protein EmrD, the closest homolog to NorA.
Conclusions:
Hs-PPy interferes with biofilm formation by MRSA, has synergistic potential, and is an efflux pump inhibitor.
Insights
Highly soluble polypyrrole (Hs-PPy) demonstrates antimicrobial and antibiofilm activity against methicillin-resistant Staphylococcus aureus (MRSA). Hs-PPy synergizes with oxacillin and inhibits MRSA biofilm formation, offering potential therapeutic applications.
Area of Science:
- Materials Science
- Microbiology
- Computational Chemistry
Background:
- Methicillin-resistant Staphylococcus aureus (MRSA) poses a significant threat due to its resistance to antibiotics.
- Bacterial biofilms contribute to persistent infections and treatment challenges.
- Efflux pumps are a key mechanism for antibiotic resistance in bacteria.
Purpose of the Study:
- To assess the antimicrobial and antibiofilm efficacy of highly soluble polypyrrole (Hs-PPy) against MRSA.
- To investigate the synergistic effect of Hs-PPy in combination with oxacillin.
- To explore the in silico mechanism of Hs-PPy as an efflux pump inhibitor.
Main Methods:
- Broth microdilution and checkerboard assays were used to determine antimicrobial activity and synergistic effects.
- Biofilm formation assays evaluated the antibiofilm potential of Hs-PPy.
- In silico molecular docking was employed to investigate interactions with efflux pumps.
Main Results:
- Hs-PPy exhibited antimicrobial activity against MRSA isolates (62.5–125 µg/mL) and bactericidal effects at 62.5 µg/mL.
- A synergistic effect was observed when Hs-PPy was combined with oxacillin.
- Hs-PPy interfered with the formation of MRSA biofilms but not with mature biofilms.
- In silico analysis showed no interaction with the EmrD efflux protein.
Conclusions:
- Hs-PPy possesses significant antimicrobial and antibiofilm properties against MRSA.
- Hs-PPy demonstrates synergistic potential with oxacillin, enhancing its efficacy.
- Hs-PPy acts as an inhibitor of MRSA biofilm formation, suggesting therapeutic utility.
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