High-resolution NMR studies of antibiotics in cellular membranes

Area of Science:

• Biochemistry
• Microbiology
• Structural Biology

Background:

• Antimicrobial resistance (AMR) necessitates novel antibiotics targeting essential bacterial pathways.
• Lipid II, a precursor in peptidoglycan synthesis, is a promising target due to its essential role and conserved pyrophosphate group.
• Understanding antibiotic binding modes to lipid II in native membrane environments is crucial for drug development but remains challenging.

Purpose of the Study:

• To develop and apply a high-resolution method for studying lipid II-binding antibiotics in native cell membranes.
• To elucidate the native binding mode of the lantibiotic nisin to lipid II.
• To identify structural features of antibiotics critical for efficacy and adaptability against multidrug-resistant pathogens.

Main Methods:

• Utilized advanced, highly sensitive solid-state Nuclear Magnetic Resonance (ssNMR) spectroscopy.
• Investigated antibiotic-lipid II complexes directly within cell membranes.
• Applied structural biology techniques to analyze drug-receptor interactions at high resolution.

Main Results:

• Presented a novel high-resolution approach to study antibiotic-lipid II interactions in native membrane environments.
• Demonstrated that the native binding mode of nisin to lipid II differs significantly from previously reported structures.
• Identified functional hotspots within nisin that correspond to flexible drug domains crucial for its cellular adaptability.

Conclusions:

• The developed ssNMR approach enables detailed structural studies of membrane-embedded antibiotic-target complexes.
• Nisin's native binding mode and its adaptable structural features offer insights into effective antibiotic design.
• This work lays the groundwork for designing new antibiotics that target lipid II effectively against multidrug-resistant bacteria.