A FtsZ Inhibitor That Can Utilize Siderophore-Ferric Iron Uptake Transporter Systems for Activity against...

Area of Science:

• Microbiology
• Drug Discovery
• Bacterial Pathogenesis

Background:

• Multidrug-resistant Gram-negative bacteria pose a significant global health threat.
• FtsZ is a crucial protein for bacterial cell division and a promising antibiotic target.
• Existing FtsZ inhibitors struggle with intracellular accumulation in Gram-negative pathogens.

Purpose of the Study:

• To design and evaluate a novel FtsZ inhibitor with enhanced uptake in Gram-negative bacteria.
• To investigate the mechanism of action and synergistic potential of the new inhibitor.

Main Methods:

• Design of RUP4, an FtsZ inhibitor with a chlorocatechol siderophore for iron chelation and uptake.
• Testing RUP4 activity against Klebsiella pneumoniae and Acinetobacter baumannii.
• Genetic analysis of RUP4 uptake pathways in K. pneumoniae.
• Evaluating synergistic effects of RUP4 with other antibiotics.

Main Results:

• RUP4 demonstrates activity against K. pneumoniae and A. baumannii, dependent on Fe3+ chelation.
• Iron-limiting conditions enhance RUP4 efficacy.
• RUP4 utilizes FepA, CirA, and FhuBC transporters for entry into K. pneumoniae.
• RUP4 shows bactericidal synergy with PBP2-targeting β-lactams and MreB inhibitors.

Conclusions:

• Incorporating Fe3+-chelating moieties into FtsZ inhibitors enhances activity against Gram-negative pathogens.
• RUP4 represents a promising new strategy for combating multidrug-resistant Gram-negative infections.
• Targeting bacterial iron uptake pathways can overcome limitations in antibiotic intracellular accumulation.