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Antimicrobial Peptides and Small Molecules Targeting the Cell Membrane of Staphylococcus aureus
Narchonai Ganesan1, Biswajit Mishra1,2, LewisOscar Felix1
1Infectious Diseases Division, Alpert Medical School, Brown University, Providence, Rhode Island, USA.
Abstract:
Clinical management of Staphylococcus aureus infections presents a challenge due to the high incidence, considerable virulence, and emergence of drug resistance mechanisms. The treatment of drug-resistant strains, such as methicillin-resistant S. aureus (MRSA), is further complicated by the development of tolerance and persistence to antimicrobial agents in clinical use. To address these challenges, membrane disruptors, that are not generally considered during drug discovery for agents against S. aureus, should be explored. The cell membrane protects S. aureus from external stresses and antimicrobial agents, but membrane-targeting antimicrobial agents are probably less likely to promote bacterial resistance. Nontypical linear cationic antimicrobial peptides (AMPs), highly modified AMPs such as daptomycin (lipopeptide), bacitracin (cyclic peptide), and gramicidin S (cyclic peptide), are currently in clinical use. Recent studies have demonstrated that AMPs and small molecules can penetrate the cell membrane of S. aureus, inhibit phospholipid biosynthesis, or block the passage of solutes between the periplasm and the exterior of the cell. In addition to their primary mechanism of action (MOA) that targets the bacterial membrane, AMPs and small molecules may also impact bacteria through secondary mechanisms such as targeting the biofilm, and downregulating virulence genes of S. aureus. In this review, we discuss the current state of research into cell membrane-targeting AMPs and small molecules and their potential mechanisms of action against drug-resistant physiological forms of S. aureus, including persister cells and biofilms.
Insights
Exploring novel membrane-disrupting agents is crucial for combating drug-resistant Staphylococcus aureus infections. These agents offer a promising strategy against challenging bacterial forms like persister cells and biofilms.
Area of Science:
- Microbiology
- Drug Discovery
- Antimicrobial Resistance
Background:
- Staphylococcus aureus infections pose significant clinical challenges due to high incidence, virulence, and emerging drug resistance.
- Drug-resistant strains, including methicillin-resistant S. aureus (MRSA), are further complicated by tolerance and persistence to existing antimicrobials.
- Conventional drug discovery often overlooks membrane-targeting agents for S. aureus.
Purpose of the Study:
- To review the current research on cell membrane-targeting antimicrobial peptides (AMPs) and small molecules against Staphylococcus aureus.
- To explore the potential mechanisms of action (MOA) of these agents against drug-resistant S. aureus, including persister cells and biofilms.
- To highlight membrane disruptors as a promising avenue for developing new therapies against S. aureus.
Main Methods:
- Review of existing literature on antimicrobial peptides and small molecules targeting the bacterial cell membrane.
- Analysis of studies demonstrating the penetration of S. aureus cell membrane by AMPs and small molecules.
- Discussion of primary and secondary mechanisms of action, including inhibition of phospholipid biosynthesis, solute transport blockage, biofilm targeting, and virulence gene downregulation.
Main Results:
- Antimicrobial peptides (AMPs) and small molecules can effectively target the S. aureus cell membrane.
- These agents can inhibit essential cellular processes like phospholipid biosynthesis or disrupt solute transport.
- Secondary mechanisms, such as biofilm disruption and virulence gene downregulation, contribute to their efficacy.
- Membrane-targeting agents show potential against drug-resistant physiological forms, including persister cells and biofilms.
Conclusions:
- Cell membrane-targeting agents, including AMPs and small molecules, represent a vital strategy for overcoming S. aureus drug resistance.
- Their unique mechanisms of action may reduce the likelihood of resistance development compared to conventional antibiotics.
- Further research into these agents is warranted for the development of novel therapeutics against challenging S. aureus infections.
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