Bile-Resistant Bacillus Spores for Rapid Amino Acid Secretion
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Solution Overview
Problem
Existing bacillus compositions used in animal feed do not efficiently germinate and outgrow in the presence of bile salts, leading to slow production of essential amino acids, as they are not selected for rapid germination and outgrowth criteria.
Innovation Solution
A novel selection method is developed to identify bacillus spore cells that rapidly germinate and outgrow in bile salt environments, with strains like DSM 19467 achieving vegetative cell growth within 18-19 hours in 4-6 mM bile salts, and producing higher amounts of essential amino acids through mutagenesis.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If conventional bacillus spores are used in animal feed, then they can pass the acidic gastric barrier and germinate in the GIT, but they are inhibited by bile salts and germinate slowly, leading to delayed production of essential amino acids
Solution Approach 1:
The patent applies parameter changes by selecting and characterizing Bacillus spores based on specific germination kinetics parameters in the presence of bile salts. The spores are identified by their ability to reach a vegetative cell growth point (OD630 of 0.4) within specific timeframes (less than 18 hours at 4mM bile salt, less than 19 hours at 6mM bile salt), representing a quantitative parameter-based selection approach that resolves the contradiction between bile salt resistance and rapid germination
Solution Approach 2:
The patent utilizes spore germination as a transient, single-use event in the gastrointestinal tract. The spores are designed to germinate rapidly and produce essential amino acids during their short residence time in the GIT, then complete their function and be eliminated. This disposable approach maximizes the benefit during the brief window of intestinal presence while avoiding the need for long-term survival mechanisms that would slow germination
2Reliability
If bacillus spores are selected for bile salt resistance, then they can survive in the GIT environment, but existing selections do not ensure rapid outgrowth and high-level secretion of essential amino acids
Solution Approach 1:
The patent employs parameter changes by establishing specific quantitative criteria for both reliability (bile salt resistance with rapid germination kinetics) and productivity (high-level essential amino acid secretion). The dual characterization approach selects spores that meet both the survival parameter (germination within 18-19 hours in bile salt) and the production parameter (high essential amino acid secretion), resolving the contradiction between reliability and productivity through multi-parameter selection
Solution Approach 2:
The patent implements feedback by using the germination performance and amino acid production characteristics as selection criteria for identifying superior spore strains. The measured outcomes (germination time, OD630 values, essential amino acid secretion levels) feed back into the strain selection process, ensuring that only spores demonstrating both reliable survival and high productivity are characterized and recommended for use
3Quantity of substance
If bacillus spores germinate slowly in bile salt environment, then they may be more resistant to bile salts, but they fail to produce sufficient essential amino acids within the residence time in the gastrointestinal tract
Solution Approach 1:
The patent resolves this contradiction through parameter changes by defining specific time thresholds for germination (less than 18 hours at 4mM bile salt, less than 19 hours at 6mM bile salt) and corresponding essential amino acid production levels. This quantitative parameter specification ensures that spores germinate fast enough to produce sufficient amino acids before being eliminated from the GIT, while maintaining bile salt resistance
Solution Approach 2:
The patent applies preliminary action by pre-selecting and characterizing spore strains with optimized germination kinetics and amino acid production capabilities before their application in animal feed. The spores are screened in advance under simulated GIT conditions (presence of bile salts) to identify strains that will rapidly germinate and produce essential amino acids, ensuring they are prepared and optimized before encountering the actual gastrointestinal environment
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 selected bacillus strains effectively produce high amounts of essential amino acids and rapidly germinate and outgrow in bile salt environments, ensuring they can exert probiotic effects and inhibit pathogenic bacteria in the gastrointestinal tract.
Implementation Method 1
Bacillus spores have a rapid germination and outgrowth from spore to vegetative cell in presence of a bile salt medium
Implementation Method 2
the bacillus vegetative cells are producing at least one essential amino acid in an amount that is higher than the reference bacillus cell
Data Source
AI summary
A bacillus composition characterized by fast germination and outgrowth in bile salts (simulated gut environment) and by high-level secretion of essential amino acid. The bacillus composition may be used as supplement in animal feed where it has a probiotic (health promoting) effect and increases the digestion and availability of nutrients from animal feeds.