Enterobactin-Cargo Conjugates for Gram-Negative Bacterial Delivery
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Solution Overview
Problem
Current antibiotics face challenges in penetrating the outer membrane of Gram-negative bacteria, such as Escherichia coli and Salmonella, leading to ineffective treatment of resistant bacterial infections.
Innovation Solution
Development of novel enterobactin-cargo conjugates that facilitate the delivery of antibiotics and other cargos into bacterial cells by leveraging the enterobactin uptake machinery, allowing for site-specific synthetic modification and targeting of Gram-negative bacteria.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional antibiotics are used, then treatment of bacterial infections is attempted, but the outer membrane of Gram-negative bacteria prevents effective penetration and delivery of the antibiotic
Solution Approach 1:
The patent uses enterobactin as an intermediary molecule that the bacteria naturally import to deliver antibiotics into the cell. The enterobactin-antibiotic conjugate is recognized by bacterial transport systems (FepA, Cir, Fiu) that normally import siderophores, thereby mediating antibiotic delivery through the outer membrane barrier that would otherwise block conventional antibiotics
Solution Approach 2:
The invention exploits the bacteria's own iron acquisition machinery against them. By conjugating antibiotics to enterobactin, the bacteria's natural siderophore import systems (FepA, Cir, Fiu transporters) are hijacked to actively transport the antibiotic-conjugate into the cell, making the bacteria's own physiological processes work in favor of antibiotic delivery
2Adaptability or versatility
If siderophores are modified for drug delivery, then antibiotic resistance is addressed, but synthetic modification of siderophores must be facile and site-specific
Solution Approach 1:
The patent introduces site-specific modification capabilities at defined positions on the enterobactin scaffold. The synthesis methods allow for selective functionalization at specific hydroxyl groups (e.g., positions 3, 5, or 8) rather than random modification, enabling precise control over where cargo molecules are attached while maintaining the core siderophore structure and bacterial recognition
Solution Approach 2:
The enterobactin molecule is divided into distinct functional regions: the core triscatecholate scaffold that maintains bacterial recognition, and peripheral modification sites that can be independently functionalized with different cargos. This segmentation allows the core structure to retain its biological function while peripheral groups are tailored for specific therapeutic purposes
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The enterobactin-cargo conjugates effectively transport antibiotics and other molecules into bacterial cells, enhancing their therapeutic efficacy against Gram-negative bacteria, including resistant strains, and enabling the treatment of infections like cystic fibrosis and inflammatory bowel disease.
Implementation Method 1
Enterobactin coordinates Fe(III) by its three catecholate groups with Ka ̃1049 M−1
Implementation Method 2
Subsequently, [Fe(Ent)]3− is transported into the cytosol, which requires the action of ExbBD, TonB, and FepCDG
Data Source
AI summary
The present invention provides novel enterobactin-cargo conjugates, such as compounds of Formula (I), and salts thereof, where X is the cargo and may be an antibiotic, a fluorophore, or biotin. The present invention also provides complexes, compositions, kits, and methods that involve the compounds of Formula (I) and are useful in delivering a cargo to a bacterium, treating a bacterial infection, cystic fibrosis, and/or inflammatory bowel disease in a subject, preventing a bacterial infection, cystic fibrosis, and/or inflammatory bowel disease in a subject, inhibiting the growth of or killing a bacterium, or determining the concentration of a bacterium in a biological sample. In certain embodiments, the bacterium is a Gram-negative bacterium.