Inducing Genetic Competence in Bacillus Cells
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Solution Overview
Problem
Bacillus licheniformis strains are generally non-competent, making it difficult to achieve genetic transformation through natural competence, which is essential for constructing improved production strains, as they require alternative methods like electroporation or protoplasting, which are less efficient and more complex.
Innovation Solution
Introduction of a nucleic acid construct with a promoter region linked to a polynucleotide encoding the ComS polypeptide, which is foreign to the Bacillus host cell, to induce genetic competence, allowing for the transformation of exogenous DNA and subsequent isolation of competent cells.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If alternative methods like electroporation or protoplasting are used for genetic transformation in Bacillus licheniformis, then transformation can be achieved, but the process becomes less efficient and more complex
Solution Approach 1:
The invention changes the physiological state of Bacillus licheniformis cells by inducing natural competence through specific cultural conditions and signaling molecules. This transforms the cells from a non-competent state to a competent state capable of natural DNA uptake, thereby achieving reliable transformation through a simpler natural process rather than complex artificial methods like electroporation or protoplasting
2Reliability
If alternative methods like electroporation or protoplasting are used for genetic transformation, then transformation can be achieved, but the process becomes less efficient
Solution Approach 1:
The invention optimizes cultural parameters including growth phase, nutrient composition, and addition of competence-inducing signals to maximize the proportion of competent cells in the population. This increases transformation efficiency by ensuring a higher fraction of cells are in the competent state ready for natural DNA uptake, compared to alternative methods
3Productivity
If natural competence is induced in Bacillus licheniformis, then transformation efficiency increases, but the cells must be in a specific physiological state
Solution Approach 1:
The invention requires preliminary cultivation of cells under specific conditions to induce competence before DNA transformation can occur. Cells are grown to a specific optical density, nutrients are adjusted, and competence-inducing signals are added beforehand to prepare the cells in the appropriate physiological state, ensuring high transformation efficiency when DNA is introduced
Data Source
AI summary
The present invention relates to methods of obtaining genetic competence in non-competent Bacillus cells for their transformation with exogenous DNA.