Related Experiment Video
Updated: Nov 7, 2025
11:57
Electroporation of Mycobacteria
Published on: May 23, 2008
25.7K
High-efficiency transformation of Streptococcus thermophilus using electroporation
Ling-Hui Kong1, Zhi-Qiang Xiong1, Yong-Jun Xia1
1Shanghai Engineering Research Center of Food Microbiology, School of Medical Instrument and Food Engineering, University of Shanghai for Science and Technology, Shanghai, China.
Journal of the Science of Food and Agriculture
|May 3, 2021
Summary
Researchers optimized electroporation for Streptococcus thermophilus S-3, significantly increasing genetic transformation efficiency. This improvement, linked to competence gene expression, aids in developing beneficial bacterial strains for food fermentation.
Area of Science:
- Microbiology
- Molecular Biology
- Biotechnology
Background:
- Streptococcus thermophilus is a key lactic acid bacterium vital for food fermentation and quality improvement.
- Existing genetic transformation methods for S. thermophilus S-3 are inefficient, limiting further research.
Purpose of the Study:
- To develop and optimize efficient genetic transformation protocols for Streptococcus thermophilus S-3.
- To investigate the role of competence genes in enhancing bacterial transformability.
Main Methods:
- Development of three electroporation-based transformation methods.
- Optimization of various parameters to maximize transformation efficiency.
- Transcriptional analysis of competence genes.
- Overexpression of specific competence genes (comEA, cbpD, comX).
Main Results:
- Transformation efficiency was enhanced up to 1.3 × 10^6 CFU/μg DNA, a 32-fold increase compared to unoptimized methods.
- Optimization led to significant up-regulation of competence genes in S. thermophilus S-3.
- Overexpression of comEA resulted in a 14-fold increase in transformation efficiency compared to the control.
Conclusions:
- This study reports the first successful enhancement of transformability in Streptococcus thermophilus through competence gene expression.
- The findings support the use of competence gene manipulation for developing strains with desirable characteristics for industrial applications.
Related Concept Videos
01:33Bacterial Transformation
58.2K
In 1928, bacteriologist Frederick Griffith worked on a vaccine for pneumonia, which is caused by Streptococcus pneumoniae bacteria. Griffith studied two pneumonia strains in mice: one pathogenic and one non-pathogenic. Only the pathogenic strain killed host mice.
Griffith made an unexpected discovery when he killed the pathogenic strain and mixed its remains with the live, non-pathogenic strain. Not only did the mixture kill host mice, but it also contained living pathogenic bacteria that...
Griffith made an unexpected discovery when he killed the pathogenic strain and mixed its remains with the live, non-pathogenic strain. Not only did the mixture kill host mice, but it also contained living pathogenic bacteria that...
58.2K
01:26Transformation
349
Microbial communities are dynamic environments where cell lysis releases free DNA into the surroundings. Other cells can take up this extracellular DNA through a process known as transformation.When a cell incorporates this foreign DNA into its genome, resulting in genetic modification, the process is known as transformation. Cells capable of this process are termed competent. Competence can be natural, as observed in certain bacteria and archaea, or artificially induced in the...
349