Truncated SecG Proteins for Bacterial Polypeptide Secretion
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Solution Overview
Problem
Current methods for secreting heterologous polypeptides in bacterial host cells, such as Bacillus species, are limited in efficiency and specificity, necessitating the development of improved techniques for polypeptide secretion.
Innovation Solution
The use of truncated SecG proteins, which can be encoded by polynucleotides and integrated into bacterial host cells to facilitate the secretion of desired proteases, either by replacing or complementing the endogenous SecG gene, thereby enhancing the production and secretion of specific polypeptides.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If current secretion methods are used in bacterial host cells, then polypeptide secretion can be achieved, but the efficiency and specificity are limited
Solution Approach 1:
The invention modifies the SecG protein by truncating it to specific lengths (e.g., removing C-terminal residues) to alter its functional parameters. This parameter change in the secretion system components enables both high efficiency and specificity of polypeptide secretion, resolving the contradiction between productivity and reliability in the secretion process
2Productivity
If truncated SecG proteins are used to enhance secretion, then polypeptide production increases, but the system complexity increases
Solution Approach 1:
The SecG protein is segmented by truncating specific portions (N-terminal or C-terminal regions) to create functional fragments. This segmentation approach maintains the essential secretion function while simplifying the overall system architecture, thereby increasing polypeptide production without proportionally increasing system complexity
Solution Approach 2:
Specific regions of the SecG protein are extracted or removed (truncated) to create a simplified version that retains core secretion functionality. This extraction of non-essential portions reduces system complexity while preserving the ability to enhance polypeptide production
Data Source
AI summary
The present invention provides methods of altering the production of desired polypeptides in a host cell. In particular, the present invention provides polynucleotides encoding truncated SecG proteins capable of facilitating the secretion of desired proteases by a bacterial host cell, such as Bacillus species, as well as expression vectors and a host cell containing the polynucleotides.