Heterologous Protein Secretion in Coryneform Bacteria
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Solution Overview
Problem
Current methods for secretory production of heterologous proteins by coryneform bacteria are limited by the activity of the HrrSA system, which affects the efficiency of protein secretion.
Innovation Solution
Modifying coryneform bacteria to reduce the activity of the HrrSA system by reducing the number of HrrS and HrrA proteins, using genetic constructs with specific promoter sequences and signal peptides, and enhancing the expression of Tat secretion system genes to improve protein secretion efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the HrrSA system activity is reduced to improve protein secretion efficiency, then the secretory production amount of heterologous proteins increases, but the bacterial response to environmental changes may be affected
Solution Approach 1:
The HrrSA system is segmented into two separate genes (hrrS and hrrA) that can be independently modified. The invention specifically targets the hrrA gene for deletion or inactivation, while preserving the hrrS gene, thereby selectively reducing HrrSA system activity without completely abolishing the signaling pathway. This segmentation allows precise control over system activity to optimize protein secretion while maintaining essential bacterial functions.
Solution Approach 2:
The invention changes the activity parameter of the HrrSA system by deleting or inactivating the hrrA gene, thereby transforming the system from a fully active state to a reduced activity state. This parameter change directly improves protein secretion efficiency by altering the regulatory landscape without requiring complete system elimination, thus balancing productivity improvement with cellular function maintenance.
2Productivity
If genetic constructs with specific promoter sequences and signal peptides are used to enhance protein secretion, then the secretion efficiency improves, but the complexity of the genetic engineering process increases
Solution Approach 1:
The invention employs universal promoter sequences and signal peptide constructs that can be applied to multiple different heterologous protein genes. The promoter and signal peptide elements are designed as standardized, multi-functional components that work across different protein targets, reducing the need for custom-designed complex genetic constructs for each specific protein, thereby simplifying the overall genetic engineering process while maintaining high secretion efficiency.
Solution Approach 2:
The genetic constructs are pre-designed and optimized with specific promoter sequences and signal peptides before being introduced into the bacteria. This preliminary optimization of genetic elements ensures that once the constructs are in place, they immediately function at high efficiency without requiring further complex adjustments, thereby reducing the overall complexity of the genetic engineering workflow.
3Productivity
If Tat secretion system genes are enhanced to improve protein secretion pathway, then the protein secretion efficiency increases, but the metabolic burden on the bacteria increases
Solution Approach 1:
The invention enhances specific Tat secretion system genes (such as tatA, tatB, or tatC) selectively rather than upregulating the entire secretion machinery. By targeting specific local components of the Tat pathway for enhancement, the invention optimizes protein secretion efficiency through the Tat pathway while minimizing the broad metabolic burden that would result from general upregulation of all secretion-related genes and metabolic processes.
Data Source
AI summary
A novel technique for improving secretory production of a heterologous protein by coryneform bacteria is described, and thereby a method for secretory production of a heterologous protein is provided. A coryneform bacterium able to secrete a heterologous protein and modified so that the activity of HrrSA system is reduced is cultured to produce the heterologous protein by secretory production.