Location, Location, Location: Establishing Design Principles for New Antibacterials from Ferric Siderophore Transport...

Area of Science:

• Microbiology
• Medicinal Chemistry
• Drug Delivery

Background:

• Gram-negative bacteria, including ESKAPE pathogens, pose significant threats due to antibiotic resistance.
• Iron uptake via siderophores is a crucial pathway for bacterial survival.
• The Trojan Horse strategy leverages siderophore pathways to deliver antimicrobial agents.

Purpose of the Study:

• To establish molecular design principles for developing siderophore-antibiotic conjugates.
• To guide the targeted delivery of antibiotic warheads to Gram-negative bacteria.
• To explore the potential of the Trojan Horse strategy for novel antibiotic development.

Main Methods:

• Review of archetypal siderophores and their conjugates as case studies for iron transport.
• Analysis of the clinical antibiotic cefiderocol's design rationale.
• Exploration of themes including warhead-target matching, linker requirements, and 'cheater' effects.

Main Results:

• Identified key principles for matching siderophore-mediated iron transport with antibacterial target locations (periplasm vs. cytoplasm).
• Demonstrated the versatility of the Trojan Horse strategy through cefiderocol's design.
• Highlighted the importance of linker design and the impact of bacterial 'cheaters' on conjugate efficacy.

Conclusions:

• The Trojan Horse strategy offers a promising avenue for combating Gram-negative bacterial infections.
• Further research into iron transport pathways is needed to optimize siderophore-antibiotic conjugate design.
• Articulated design rules provide a foundation for developing next-generation antibiotics against resistant pathogens.