Pentamidine Analogs for Gram-Negative Outer Membrane Disruption
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Solution Overview
Problem
The development of new antibiotics effective against Gram-negative bacteria is hindered by the outer membrane barrier, and existing OM-perturbing compounds like pentamidine suffer from toxicity concerns.
Innovation Solution
Development of pentamidine analogs with modified structures that disrupt the outer membrane of Gram-negative bacteria while reducing toxicity, allowing for enhanced antibiotic activity and reduced off-target effects.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If pentamidine is used to disrupt the outer membrane of Gram-negative bacteria, then antibiotic activity is enhanced, but toxicity increases
Solution Approach 1:
The patent applies parameter changes by systematically modifying the chemical structure of pentamidine through variations in the aromatic rings, linker chains, and substituent groups. These structural parameter changes produce analogs with different binding affinities to LPS and different toxicities, allowing optimization of the activity-toxicity ratio. Specific modifications include changing the number of aromatic rings, varying linker lengths, and introducing different functional groups to tune the compound's properties.
Solution Approach 2:
The patent applies local quality by making specific localized modifications to different parts of the pentamidine molecule. Different regions of the molecule (aromatic rings, linker, terminal groups) are independently optimized for specific functions: some regions are designed for LPS binding affinity while others are modified to reduce off-target effects. This allows different parts of the molecule to have different properties, optimizing both activity and safety.
2Reliability
If OM-perturbing compounds are used to facilitate antibiotic accumulation, then Gram-negative bacterial activity is improved, but off-target disruption of host cell membranes occurs
Solution Approach 1:
The patent applies the intermediary principle by designing pentamidine analogs that specifically target and bind to bacterial LPS as an intermediary step. The analogs act as mediators that preferentially interact with bacterial membrane components (LPS) before facilitating antibiotic entry, rather than directly disrupting host cell membranes. This selective intermediary binding to bacterial targets reduces off-target effects on host cells while maintaining the desired antibiotic potentiation effect.
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 pentamidine analogs demonstrate improved potency and reduced toxicity, effectively inhibiting bacterial growth and synergizing with antibiotics to overcome resistance, as shown in both in vitro and in vivo models.
Implementation Method 1
Previous work has identified the cryptic OM-disrupting activity of the antiprotozoal drug pentamidine, which binds LPS and enhances sensitivity to a range of Gram-positive-active antibiotics
Data Source
AI summary
The present invention discloses novel pentamidine analogues such as pentamidine analogs having the general formula:wherein:X is C, N, or —CH—CH—,Y is Y1 when X is N, and Y is Y1 and Y2 when X is C, or —CH—CH—,Y1, or Y1 and Y2 independently, are selected from H, hydroxyl, lower alkyl, lower alkoxy, halogen, nitro, amino, cyano or thiol, wherein the lower alkyl or alkoxy is optionally substituted with one or more of hydroxyl, halogen, nitro, amino, cyano, thiol, or a 5- or 6-membered aromatic or non-aromatic ring, optionally substituted with one or more of hydroxyl, lower alkyl, lower alkoxy, halogen, nitro, amino, cyano or thiol, wherein Y1 is not H when X is N; orY1 is a 5- or 6-membered aromatic or non-aromatic ring, optionally substituted with one or more groups selected from hydroxyl, lower alkyl, lower alkoxy, halogen, nitro, amino, cyano, carboxy, or thiol, and Y2 is H, if present; orY1 and Y2 together with X form a 5- to 8-membered hydrocarbon ring, optionally substituted with one or more groups selected from hydroxyl, lower alkyl, lower alkoxy, halogen, nitro, amino, cyano, carboxyl, or thiol;Z is phenyl, optionally substituted with one or more groups selected from hydroxyl, lower alkyl, lower alkoxy, halogen, nitro, amino, cyano, carboxyl, or thiol; andR1 to R4 are each independently H, hydroxyl, halogen, lower alkyl or lower alkoxy;as well as related pentamidine analogs and their use to inhibit bacterial growth and treat bacterial infection.