Optimisation of DNA electroporation protocols for different plant-associated bacteria

Area of Science:

• Microbiology
• Molecular Biology
• Biotechnology

Background:

• Electroporation is crucial for genetic manipulation in microorganisms.
• Non-model bacteria, such as plant growth-promoting bacteria (PGPB), are important for plant health.
• Existing electroporation protocols often lack efficiency for these bacteria.

Purpose of the Study:

• To develop a rapid and reliable method for preparing highly competent cells for electroporation.
• To optimize the distinct stages of the electroporation process for non-model bacteria.
• To significantly enhance transformation efficiencies in PGPB.

Main Methods:

• A sequential Design of Experiments (DOE) approach was employed.
• Optimization involved three stages: competent cell preparation, electric pulse application, and transformant recovery.
• Specific DOE techniques included split-plot fractional design, response surface methodology (RSM), and Plackett-Burman design.

Main Results:

• Transformation efficiencies were increased 10 to 100-fold.
• Achieved efficiencies reached 10^5 to 10^6 CFU/μg of circular plasmid DNA.
• The optimized protocol proved effective across three different bacterial models.

Conclusions:

• The sequential DOE approach offers a significant improvement for electroporation protocols.
• This method enhances the genetic engineering capabilities for non-model bacteria, including PGPB.
• The findings have broad implications for advancing high-throughput genetic techniques in diverse microbial systems.