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Bacillus minimum genome factory: effective utilization of microbial genome information
Katsutoshi Ara1, Katsuya Ozaki, Kouji Nakamura
1Biological Science Laboratories, Kao Co., Ltd., 2606 Akabane, Ichikaimachi, Haga, Tochigi 321-3497, Japan. ara.katsutoshi@kao.co.jp
Biotechnology and Applied Biochemistry
|November 23, 2006
Summary
Researchers created a reduced-genome Bacillus subtilis strain (MG1M) by deleting non-essential genes. This engineered strain maintains essential functions and enzyme productivity, simplifying genetic studies.
Area of Science:
- Microbiology
- Genomics
- Synthetic Biology
Background:
- Bacillus subtilis, a bacterium with significant industrial and medical applications, possesses a large genome (4.2 Mbp) encoding approximately 4100 genes.
- Understanding the complex gene network, particularly genes of unknown function, is crucial for optimizing the production of secreted compounds like enzymes and antibiotics.
- Genome reduction by deleting non-essential genes is a strategy to simplify the regulatory system and facilitate the study of essential gene functions.
Purpose of the Study:
- To develop a simplified Bacillus subtilis strain with a reduced genome.
- To identify and delete non-essential genes without compromising essential cellular functions and compound production.
- To assess the impact of genome reduction on bacterial growth and the productivity of industrially relevant enzymes.
Main Methods:
- Systematic disruption and deletion of approximately 3000 non-essential genes in Bacillus subtilis, retaining 271 essential genes.
- Serial deletion of 17 genomic regions to create the MG1M strain with an approximately 1 Mbp reduction.
- Evaluation of growth characteristics in enzyme-production media and assessment of cellulase and protease productivity compared to the wild-type B. subtilis 168 strain.
Main Results:
- Successful creation of the MG1M strain, a Bacillus subtilis variant with a significantly reduced genome size.
- The MG1M strain exhibited slightly reduced growth rates in specific media but showed no major morphological alterations.
- Enzyme productivity, specifically for cellulase and protease, in the MG1M strain was comparable to that of the original B. subtilis 168 strain.
Conclusions:
- Genome reduction in Bacillus subtilis is feasible and can be achieved by selectively deleting non-essential genes.
- The developed MG1M strain demonstrates that a smaller genome does not negatively impact key industrial enzyme production capabilities.
- This reduced-genome strain serves as a valuable tool for further research into gene function and metabolic engineering in Bacillus subtilis.
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