Peptide Motif Induces Bacteriocin Without Competence
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Solution Overview
Problem
Current methods for inducing bacteriocin production in microbial organisms often concomitantly induce competence, which can lead to unwanted genetic changes and the spread of antibiotic resistance genes.
Innovation Solution
A peptide or peptidomimetic with a sequence motif Xaa1-Trp-Xaa2-Xaa3-Xaa4-Xaa5, where Xaa1 is an aromatic residue, Xaa2, Xaa3, and Xaa4 are any residues, and Xaa5 is Gly, Ile, or Val, is used to induce bacteriocin production without inducing competence.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If conventional methods are used to induce bacteriocin production, then bacteriocin production is increased, but competence is concomitantly induced leading to unwanted genetic changes and spread of antibiotic resistance genes
Solution Approach 1:
The invention separates the induction of bacteriocin production from the induction of competence by using two different peptide signals. The first peptide (e.g., ComX or its analogs) specifically induces competence without inducing bacteriocin production, while the second peptide (e.g., pheromone-like peptides) induces bacteriocin production without inducing competence. This segmentation allows independent control of the two physiological processes.
Solution Approach 2:
The invention uses peptide intermediaries that act as specific signals to trigger desired physiological responses. These peptide compounds serve as mediators that can selectively activate bacteriocin production pathways without activating competence pathways, thereby avoiding the harmful effects of competence induction while maintaining the beneficial effects of bacteriocin production.
2Adaptability or versatility
If competence is induced to enhance microbial population tuning, then genetic diversity and adaptability are improved, but fitness burden increases and unwanted genetic changes occur
Solution Approach 1:
The invention segments the control of competence and bacteriocin production into separate, independently controllable pathways using different peptide signals. This allows the system to achieve population tuning and adaptability through bacteriocin-mediated competition without imposing the fitness burden associated with competence induction.
Solution Approach 2:
The invention converts the harmful effect of competence-induced fitness burden into a beneficial system by using alternative peptide-mediated signaling that achieves the desired population control through bacteriocin production alone, eliminating the need for competence induction and its associated fitness costs.
3Productivity
If peptide ligands are designed to activate bacteriocin production, then production efficiency is improved, but specificity and selectivity must be maintained to avoid off-target effects
Solution Approach 1:
The invention employs peptides with specific local sequence characteristics and structural features that enable selective binding to their target receptors. The peptide design incorporates specific amino acid motifs and structural elements that ensure high affinity and specificity for the intended receptor, preventing off-target effects while maintaining high production efficiency.
Solution Approach 2:
The invention optimizes peptide parameters such as amino acid sequence, length, charge distribution, and structural conformation to achieve the desired balance between productivity and specificity. By carefully tuning these parameters, the peptides can selectively activate bacteriocin production pathways with high efficiency while maintaining strict specificity and avoiding activation of unrelated pathways.
Data Source
AI summary
Described herein is a peptide or peptidomimetic with a length of at least 6 residues comprising, consisting essentially of, or consisting of the sequence motif Xaa1-Trp-Xaa2-Xaa3-Xaa4-Xaa5 (SEQ ID NO:1), wherein: Xaa1 represents an aromatic residue (Phe, Tyr, Trp, His), Cys or Ser; Xaa2, Xaa3 and Xaa4 represent any residue; and Xaa5 represents Gly, lie or Val.