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Published on: January 1, 2016
An Engineered Nisin Analogue with a Hydrophobic Moiety Attached at Position 17 Selectively Inhibits Enterococcus
Longcheng Guo1, Oscar P Kuipers1, Jaap Broos1
1Department of Molecular Genetics, Groningen Biomolecular Sciences and Biotechnology Institute, University of Groningen, Groningen, 9747 AG, The Netherlands.
A novel dual-action antibiotic, compound 47, was developed using nisin as a template. This modified lantibiotic shows enhanced specificity for *E. faecium*, improved stability, and retains nisin
Area of Science:
- Microbiology
- Drug Discovery
- Biochemistry
Background:
- Antibiotic resistance poses a significant global health threat due to the misuse of broad-spectrum antibiotics.
- Narrow-spectrum antibiotics with dual-action mechanisms, like nisin, are less prone to inducing resistance.
- There is a critical need for novel antibiotics targeting specific human pathogens.
Purpose of the Study:
- To develop a potent, narrow-spectrum, dual-mode-acting antibiotic based on the lantibiotic nisin.
- To enhance the specificity and stability of nisin against target pathogens.
Main Methods:
- Nisin was modified by introducing the unnatural amino acid azidohomoalanine.
- Click chemistry was employed to attach various alkyne-containing tails to the modified nisin.
- Compound 47, a nisin variant with a benzyl group-containing tail, was synthesized and characterized.
Main Results:
- Compound 47 demonstrated potent activity against drug-resistant *E. faecium* strains (MIC 3.8 mg/L), similar to nisin.
- Activity against *Staphylococcus aureus* and *Bacillus cereus* was significantly reduced, indicating enhanced specificity.
- Compound 47 exhibited increased resistance to proteolytic degradation and maintained low hemolytic activity.
Conclusions:
- The modified nisin variant, compound 47, offers enhanced target organism specificity and improved stability.
- This development represents a promising strategy for creating targeted antibacterial agents with reduced resistance potential.
- Compound 47's mechanism involves cell wall synthesis inhibition and pore formation, similar to nisin.
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