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Published on: August 11, 2018
Antimicrobial peptide mechanism of action on S. aureus membranes determined by in vivo solid-state NMR
Laila Zaatouf1, Thierry Drujon1, Astrid Walrant1
1Chimie Physique et Chimie du Vivant, CPCV, CNRS UMR 8228, Sorbonne Université, École Normale Supérieure, PSL University, 75005 Paris, France.
Abstract:
Staphylococcus aureus (S. aureus) is a Gram-positive pathogenic bacterium and a major cause of nosocomial infections. Between 20 % and 50 % of S. aureus strains are resistant to a wide range of antibiotics. DMS-DA6-NH2 (DA6) is a novel antimicrobial peptide (AMP) that exhibits high efficacy against various bacterial strains, particularly S. aureus, by disrupting its membrane through an as-yet-unknown mechanism. We employed in vivo2H solid state Nuclear Magnetic Resonance (NMR) to investigate the mode of action of AMPs on deuterated bacteria. This technique provides insights into membrane order and its changes with increasing AMP concentration. Our results enabled us to compare the mechanism of DA6 with those of AMPs with established modes of action. We found that DA6 induces pore formation in the membrane of S. aureus. This protocol serves as a template for determining the mechanisms of action of other peptides, an essential step for developing and patenting such drugs for the treatment of human diseases.
Insights
DMS-DA6-NH2 (DA6), an antimicrobial peptide, effectively targets antibiotic-resistant Staphylococcus aureus by forming pores in bacterial membranes. This discovery offers a new strategy for developing treatments against dangerous S. aureus infections.
Area of Science:
- Microbiology
- Biochemistry
- Drug Discovery
Background:
- Staphylococcus aureus (S. aureus) is a significant cause of hospital-acquired infections.
- A substantial percentage (20-50%) of S. aureus strains exhibit antibiotic resistance.
- The mechanism of action for novel antimicrobial peptides like DMS-DA6-NH2 (DA6) remains largely unknown.
Purpose of the Study:
- To elucidate the membrane-disrupting mechanism of the novel antimicrobial peptide DMS-DA6-NH2 (DA6) against Staphylococcus aureus.
- To establish a methodology for investigating antimicrobial peptide mechanisms of action using advanced biophysical techniques.
- To compare the action of DA6 with known antimicrobial peptide mechanisms.
Main Methods:
- Utilized in vivo 2H solid-state Nuclear Magnetic Resonance (NMR) spectroscopy.
- Investigated changes in bacterial membrane order with increasing concentrations of DA6.
- Employed deuterated bacteria to enable NMR analysis of peptide-membrane interactions.
Main Results:
- Demonstrated that DA6 induces pore formation in the cell membrane of Staphylococcus aureus.
- Quantified changes in membrane order as a function of DA6 concentration.
- Provided a comparative analysis of DA6's mechanism against established antimicrobial peptide actions.
Conclusions:
- DMS-DA6-NH2 (DA6) exerts its antimicrobial effect by creating pores in the S. aureus membrane.
- The developed NMR protocol is effective for characterizing antimicrobial peptide mechanisms.
- Understanding these mechanisms is crucial for the development and patenting of new anti-infective drugs.
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