Engineered Bacteriocin Peptides for Lactic Acid Bacteria Control
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Commercial fermentation processes, such as ethanol production from yeast, are often hindered by bacterial contamination from lactic acid bacteria, leading to reduced yields and economic losses, and current antibiotic solutions are undesirable due to antibiotic resistance concerns.
Innovation Solution
Engineering variants of antibacterial peptides, such as persulcatusin and pediocin PA-1, with specific amino acid alterations to enhance their spectrum of activity against lactic acid bacteria, and incorporating these peptides into recombinant yeast strains to secrete them into the culture medium, either alone or in combination with small molecule antibiotics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If small molecule antibiotics such as virginiamycin are used to inhibit bacterial growth, then bacterial contamination is reduced and ethanol yield is maintained, but antibiotic resistance concerns increase and demand for antibiotic-free distillers grains arises
Solution Approach 1:
The patent modifies the chemical structure and sequence of bacteriocin peptides by introducing specific amino acid alterations at defined positions (e.g., F6A, F6L, F6S, F6V, N7D, G9D, R13A, R13S, H14F, H14Q, R16A, R16G, R16K, R16S, I18F, I18N, I18V, R20A, R20K, R20S, R20T, R21A, R21G, R21S, A26D, L28A, L28M, F29A, F29L, F29V, R38A) to enhance antibacterial activity and broaden spectrum against lactic acid bacteria, thereby achieving effective contamination control without relying on conventional antibiotics
Solution Approach 2:
The patent employs naturally derived bacteriocin peptides as a temporary, non-persistent antibacterial agent that decomposes naturally in the fermentation system, eliminating the need for long-lasting antibiotic compounds and their associated resistance development issues
2Object-affected harmful factors
If pediocin PA-1 is used as an alternative to antibiotics, then antibiotic resistance is avoided, but antibacterial activity is limited to only some lactic acid bacteria and not all contaminants
Solution Approach 1:
The patent creates engineered bacteriocin variants that perform multiple functions by expanding the spectrum of antibacterial activity to cover diverse lactic acid bacteria species (including Lactobacillus reuteri, Weissella confusa, Lactobacillus fermentum, Lactobacillus amylovorus, and Lactobacillus casei) while maintaining the natural decomposition characteristics of peptide-based agents
Solution Approach 2:
The patent systematically modifies specific amino acid positions in the bacteriocin peptide sequence to alter binding affinity and target specificity, enabling the single peptide variant to effectively inhibit multiple different lactic acid bacteria species through enhanced structural adaptability
3Stability of the object's composition
If lactic acid bacteria are allowed to compete with yeast cells for nutrients, then natural fermentation dynamics are maintained, but yeast cell growth is inhibited and ethanol yield is reduced
Solution Approach 1:
The patent introduces engineered bacteriocin peptides as intermediary substances that mediate the interaction between yeast cells and lactic acid bacteria, creating a protective barrier that prevents direct nutritional competition while maintaining overall fermentation stability and yeast-dominated dynamics
Solution Approach 2:
The patent applies preliminary antibacterial action by secreting bacteriocin peptides before significant bacterial contamination occurs, pre-establishing protective zones that prevent lactic acid bacteria from establishing themselves and competing for nutrients during the critical fermentation period
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 engineered peptides demonstrate improved inhibitory activity against lactic acid bacteria, reducing contamination and maintaining fermentation efficiency while minimizing antibiotic use.
Implementation Method 1
the engineered persulcatusin inhibits the growth of a lactic acid bacterium
Implementation Method 2
recombinant cells capable of secreting such a peptide into culture medium
Data Source
AI summary
Provided herein are compositions and methods for reducing bacterial contamination during cell culture. Such compositions and methods utilize engineered peptides or recombinant cells capable of secreting such peptides into culture medium. Also provided are methods of using the engineered peptides for inhibiting bacterial growth during culturing of cells.