Cyclic Peptide Antimicrobials for Plant Pathogen Control
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Solution Overview
Problem
Current antimicrobial agents, particularly chemical microbicides, are ineffective against various plant pathogens, lead to resistance, and pose environmental concerns, necessitating a natural bio-control agent with broad-spectrum activity to prevent microbial growth on plants and during post-harvest storage.
Innovation Solution
A method using a cyclic decapeptide produced from Bacillus aneurinolyticus, specifically tyrocidine, tryptocidine, or phenycidine, or their analogues, applied as an antimicrobial composition to control fungal and bacterial pathogens on plants, plant material, and in media, combined with other antimicrobial compounds for enhanced efficacy and stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If chemical microbicides are used to control plant pathogens, then microbial growth is suppressed, but resistance develops and environmental harm increases
Solution Approach 1:
The patent transitions from chemical microbicides to cyclic peptide antimicrobials, changing the chemical structure and mode of action parameters. The cyclic peptides (tyrocidines, tryptocidines, phenycidines) have a unique cyclic decapeptide structure that differs fundamentally from conventional chemical fungicides, providing new mechanisms of action that bypass resistance to traditional chemicals while maintaining effectiveness against plant pathogens.
Solution Approach 2:
The patent employs cyclic peptides as composite antimicrobial agents that combine multiple amino acid residues in a specific cyclic arrangement. These peptides represent a composite molecular structure that integrates both antimicrobial activity and reduced environmental toxicity, differing from single-chemical-component microbicides.
2Adaptability or versatility
If broad-spectrum antimicrobial agents are used to control multiple pathogens, then coverage increases, but phytotoxicity to plants increases
Solution Approach 1:
The cyclic peptides exhibit selective toxicity through local quality differentiation - they are highly effective against fungal and bacterial pathogens while showing low phytotoxicity to plants. This selective action arises from the specific interaction of the cyclic peptide structure with microbial cell membranes versus plant cell structures, allowing broad-spectrum pathogen control without harming the host plant.
3Object-affected harmful factors
If natural bio-control agents are used instead of chemical microbicides, then environmental safety improves, but efficacy against diverse pathogens decreases
Solution Approach 1:
The cyclic peptides serve as universal antimicrobial agents that function against multiple types of pathogens including fungi, bacteria, and oomycetes. The cyclic decapeptide structure provides multi-functionality by targeting conserved cellular components across diverse microbial species, enabling a single agent to control a broad spectrum of plant pathogens while maintaining environmental safety.
Data Source
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AI summary
Compositions containing one or more tyrocidines, tryptocidines, phenycidines and/or gramicidin S, or derivatives and analogues thereof, are described for controlling antimicrobial growth on plants, plant material or plant growth media, and methods for controlling or preventing the growth of microbial pathogens, and in particular fungal pathogens, on plants, plant parts and plant material are described herein. The active agents used to control these pathogens are tyrocidines, tryptocidines, phenycidines and/or gramicidin S, or derivatives, analogues or modifications thereof. The tyrocidines, tryptocidines, phenycidines and/or gramicidin S are cyclic decapeptides having the general amino acid sequence cyc/o(valine-Xrleucine-D-phenylalanine- proline-X2-X3-X4-X5-X6) (SEQ ID NO: 1 ) or a derivative or analogue thereof, wherein X1 is ornithine or lysine, X2 is valine, leucine, isoleucine, phenylalanine, tryptophan or tyrosine; X3 is the D-isomer of valine, leucine, isoleucine, phenylalanine, tryptophan, tyrosine, ornithine, or lysine; X4 is asparagine, glutamine or leucine; X5 is glutamine, the D-isomer of valine, leucine, or isoleucine; and X6 is tyrosine, phenylalanine, tryptophan or proline.