Cationic Nonribosomal Peptides for Gram-Negative Antibiotics
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Solution Overview
Problem
The increasing incidence of multidrug-resistant Gram-negative bacteria poses a significant threat, as existing antibiotics are ineffective against these pathogens, and there is a lack of novel antibiotic classes introduced in the last 40 years, highlighting the need for new antimicrobial agents.
Innovation Solution
Global genome mining of bacterial genomes to identify and characterize cationic nonribosomal peptides (CNRPs) with potential antibacterial activity, particularly against Gram-negative bacteria, leading to the discovery of novel peptides like brevicidine and laterocidine, which exhibit strong antibacterial activity and a low risk of resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional antibiotics are used against Gram-negative bacteria, then treatment of susceptible bacteria is effective, but they are ineffective against multidrug-resistant strains
Solution Approach 1:
The patent modifies the chemical structure of natural cationic peptides by changing parameters such as amino acid composition, charge density, and hydrophobicity to enhance activity against Gram-negative bacteria while maintaining selectivity. This structural optimization resolves the contradiction by creating derivatives that overcome resistance mechanisms.
Solution Approach 2:
The invention combines cationic peptides with conventional antibiotics to create composite therapeutic regimens. The peptides act as adjuvants that disrupt bacterial membranes and enhance penetration of conventional antibiotics, thereby restoring efficacy against multidrug-resistant strains without the antibiotics alone being effective.
2Reliability
If natural cationic peptides from multicellular organisms are used, then broad antimicrobial activity is achieved, but high cost and instability to proteolytic degradation limit clinical application
Solution Approach 1:
The patent employs synthetic peptide analogs that can be produced cost-effectively through chemical synthesis or recombinant expression in bacterial systems. These synthetic versions eliminate the high cost associated with extraction from natural sources and can be designed to resist proteolytic degradation, resolving both cost and stability issues.
Solution Approach 2:
The invention modifies peptide sequences by replacing protease-sensitive amino acids with resistant variants, adding protective modifications, or optimizing structural stability. These parameter changes maintain antimicrobial activity while dramatically improving proteolytic stability and reducing production costs.
3Adaptability or versatility
If bacterial cationic nonribosomal peptides are discovered through systematic investigation, then diverse and stable antibiotics are found, but the diversity and complexity make systematic investigation difficult causing most CNRPs to remain unknown
Solution Approach 1:
The patent replaces traditional labor-intensive fermentation and purification methods with genome mining approaches using bioinformatics tools. By sequencing bacterial genomes and identifying nonribosomal peptide synthetase (NRPS) gene clusters, researchers can predict and prioritize CNRP candidates computationally, dramatically simplifying the discovery process while capturing the full diversity of potential compounds.
Solution Approach 2:
The invention performs preliminary genomic analysis and bioinformatic screening to identify promising CNRP gene clusters before committing to expensive and time-consuming fermentation and characterization. This preliminary action filters the vast diversity of bacterial genomes to focus resources on the most promising candidates, making systematic investigation feasible.
Data Source
AI summary
Pharmacological compositions comprising a cationic nonribosomal peptide (CNRP) or a salt thereof are described. Further, methods of treating a bacterial infection in a subject by administering to the subject a CNRP or a salt thereof are provided.