A new antibiotic from an uncultured bacterium binds to an immutable target

Area of Science:

• Microbiology
• Drug Discovery
• Biochemistry

Background:

• Antimicrobial resistance (AMR) poses a significant global health threat, driving the urgent need for new antibiotics.
• The pipeline for novel antibiotics is diminishing, necessitating exploration of new sources and mechanisms of action.

Approach:

• Discovery and isolation of clovibactin from uncultured soil bacteria.
• Elucidation of clovibactin's mode of action using biochemical assays, solid-state NMR, and atomic force microscopy.
• Investigation of clovibactin's interaction with bacterial cell wall precursors and membrane components.

Key Points:

• Clovibactin demonstrates potent activity against multidrug-resistant bacterial pathogens.
• It inhibits bacterial cell wall synthesis by targeting the pyrophosphate moiety of essential peptidoglycan precursors (C55PP, Lipid II, Lipid WTA).
• Clovibactin's resistance to resistance stems from its binding to conserved pyrophosphate groups, bypassing variable precursor structures and forming supramolecular fibrils on bacterial membranes.

Conclusions:

• Clovibactin represents a promising new antibiotic candidate with a novel mechanism of action, effective against resistant bacteria.
• The discovery highlights the potential of uncultured soil bacteria as a source for novel antimicrobial agents.
• This finding could revitalize the antibiotic discovery pipeline and provide new strategies to combat the global AMR crisis.