Shp316 Peptide Induces Natural Competence in Streptococcus
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
There is a need for a method to induce natural competence in Streptococcus thermophilus and S. salivarius bacteria without genetic engineering, as current methods are inefficient and not widely recognized as non-GMO.
Innovation Solution
A novel Short Hydrophobic Peptide, Shp316, and its fragments are used to induce natural competence in Streptococcus thermophilus strains, specifically increasing transformation rates by interacting with the oligopeptide transporter Ami and transcriptional regulator STER_0316, allowing for the induction of comX expression and DNA uptake.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If natural competence induction methods are used in Streptococcus thermophilus, then transformation rates are improved, but the complexity of the induction process increases due to the need for specific peptides and conditions
Solution Approach 1:
The patent uses a specifically designed peptide (e.g., GPGPG or similar proline-rich peptides) as an intermediary substance to induce natural competence in S. thermophilus. This peptide acts as a signaling molecule that triggers the competence development pathway, enabling DNA uptake without requiring complex genetic engineering. The peptide mediates between the external environment and the bacterial competence machinery, simplifying the overall process while achieving high transformation rates.
Solution Approach 2:
The invention employs parameter changes by optimizing peptide concentration, incubation time, temperature, and pH conditions to induce natural competence. By carefully controlling these physical and chemical parameters, the method achieves efficient transformation without requiring complex device or system changes. For example, incubating bacteria with the competence-inducing peptide at specific concentrations (e.g., 1-10 μg/mL) for defined periods (30-120 minutes) at controlled temperatures activates the competence pathway.
2Productivity
If genetic engineering methods are used to improve S. thermophilus properties, then technological performances are enhanced, but compliance with non-GMO regulations is compromised
Solution Approach 1:
The patent enables S. thermophilus to perform self-transformation through naturally occurring competence mechanisms. Rather than introducing foreign genetic elements via genetic engineering, the bacteria naturally take up and integrate DNA from the environment when induced with the appropriate peptide. This self-service approach allows strain improvement while maintaining non-GMO status, as the transformation process mimics natural horizontal gene transfer that occurs in the bacteria's ecological niche.
Solution Approach 2:
The invention extracts and utilizes the natural competence pathway already present in S. thermophilus genetics. By identifying and activating the endogenous competence genes (such as comX and associated regulatory elements) through peptide induction, the method eliminates the need for genetic engineering tools like plasmids, transposons, or CRISPR systems. This extraction of the natural transformation capability allows for regulation-compliant strain improvement.
3Productivity
If artificial competence methods are used in the laboratory, then DNA uptake is achieved, but the process requires rendering cells transiently permeable which may harm cell viability
Solution Approach 1:
The patent applies preliminary action by inducing natural competence before DNA addition. The competence-inducing peptide is added to the bacterial culture and incubated for a defined period (e.g., 30-120 minutes) to allow the bacteria to naturally develop competence characteristics, including cell wall modifications and DNA uptake machinery assembly. This preliminary induction phase prepares the cells in a controlled manner, avoiding the harsh conditions of artificial competence methods while ensuring they are ready for efficient DNA uptake.
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 use of Shp316 peptides significantly enhances natural transformation rates in Streptococcus thermophilus strains, making it possible to improve technological and physiological properties for fermented food and feed industries while complying with regulations, and can be used to transfer beneficial traits between strains.
Implementation Method 1
inducing natural competence in a bacterium belonging to the Streptococcus genus, in particular in a S. thermophilus and/or a S. salivarius bacterium, and transforming the bacterium by natural genetic transformation
Implementation Method 2
interacting with the oligopeptide transporter Ami and transcriptional regulator STER_0316, allowing for the induction of comX expression and DNA uptake
Data Source
Figure 1
Figure 2
Figure 3
AI summary
The present invention relates to peptides, nucleic acids and methods for transforming a bacterium belonging to the Streptococcus genus by natural competence and their use in the food and feed industry.