Antimicrobial Linear Peptides for Plant Pathogen Control
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Solution Overview
Problem
Current methods for combating phytopathogenic bacteria such as Erwinia amylovora, Xanthomonas vesicatoria, and Pseudomonas syringae in plants are ineffective due to resistance development and environmental persistence of antibacterial compounds, with a need for new antimicrobial peptides that are easy to produce, stable, and have low cytotoxicity.
Innovation Solution
Development of linear peptides with the general formula X1-X2-Lys-Leu-Phe-Lys-Lys-Ile-Leu-Lys-X3-Leu-NH2, where X1 can be hydrogen, acetyl, p-toluene sulphonyl, benzyl, or benzoyl, and X2 and X3 are specific amino acids, which are synthesized using solid-phase peptide synthesis and exhibit antimicrobial activity against the mentioned bacteria.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If natural antimicrobial peptides like cecropin A are used, then potent lytic activity against bacteria is achieved, but production cost is high and stability against protease degradation is low
Solution Approach 1:
The patent designs short peptides (11-15 amino acids) that are cheaper to produce than long natural peptides like cecropin A (37 amino acids). The reduced length lowers synthesis costs while maintaining antimicrobial activity through optimized amino acid sequences and structures.
Solution Approach 2:
The patent modifies key parameters of natural peptides by changing amino acid sequences, lengths, and terminal modifications (acetylation, amidation). These parameter changes optimize both production ease and stability, creating synthetic peptides that are more manufacturable than natural counterparts.
2Reliability
If natural antimicrobial peptides like cecropin A are used, then potent lytic activity against bacteria is achieved, but stability against protease degradation is low
Solution Approach 1:
The patent applies local quality modifications by introducing specific amino acid residues at strategic positions within the peptide sequence. These localized changes (such as proline residues, cyclic structures, or specific side chains) provide protease resistance at critical sites while preserving overall antimicrobial activity.
Solution Approach 2:
The patent creates composite peptide structures combining hydrophobic and hydrophilic regions, aromatic and aliphatic amino acids, and modified terminal groups. This composite approach produces peptides that resist protease degradation while maintaining membrane-disrupting antimicrobial activity.
3Reliability
If existing antibacterial compounds are used, then bacterial growth inhibition is achieved, but environmental persistence occurs which is not desirable
Solution Approach 1:
The patent designs dynamic peptides that are active during application but rapidly degrade after use. The short peptide sequences and specific structures enable rapid environmental breakdown through natural processes, reducing persistence while maintaining efficacy during the treatment period.
Solution Approach 2:
The patent creates peptides that naturally degrade into harmless amino acids and small peptides after performing their antimicrobial function. This natural breakdown cycle allows the active compound to be discarded in the environment without long-term persistence, unlike traditional synthetic antibacterials.
4Reliability
If existing antibacterial compounds are used, then bacterial growth inhibition is achieved, but resistance development occurs making them ineffective
Solution Approach 1:
The patent inverts the traditional approach by using short, simple peptide sequences rather than long, complex molecules. This inversion creates novel mechanisms of action that bacteria have not encountered through evolution, reducing the likelihood of resistance development while maintaining effective antibacterial activity.
Solution Approach 2:
The patent employs parameter changes in peptide structure (amino acid composition, sequence arrangement, terminal modifications) to create multiple variants with different properties. This diversity in peptide parameters provides versatility in combating resistant strains while maintaining efficacy against sensitive bacteria.
Data Source
AI summary
The present invention relates to novel linear peptides with antimicrobial activity. Said peptides are made up of 11 amino acids, and they have the amino group of the amino acid constituting the N-terminal end in a non-derived form or functionalized with an acetyl group, p-toluene sulphonyl, benzyl or benzoyl. The amino acid constituting the C-terminal end of said peptides is in carboxamide form. The invention describes the synthesis and use of said peptides as antimicrobial agents to combat pathogenic bacteria for plants. The invention also relates to compositions containing said peptides and an auxiliary agent, and to a method for preventing and treating infections and diseases of plants caused by pathogenic bacteria.