Plasmid transformation of Bacillus sphaericus 1593

Area of Science:

• Microbiology
• Bacterial Genetics
• Molecular Biology

Background:

• Bacillus sphaericus is an entomocidal bacterium with potential applications in pest control.
• Genetic manipulation of B. sphaericus is crucial for strain improvement and understanding its biological mechanisms.
• Previous attempts at genetic transfer in B. sphaericus were limited.

Purpose of the Study:

• To establish a method for genetic transfer in Bacillus sphaericus.
• To investigate the feasibility of using protoplast transformation for introducing foreign DNA into B. sphaericus.
• To assess the stability and expression of introduced genetic material.

Main Methods:

• Protoplast preparation from Bacillus sphaericus 1593.
• Transformation of protoplasts with plasmids pUB110 and pBC16.
• Selection of transformants based on antibiotic resistance markers.
• Analysis of sporulation frequency and larvicidal toxicity.

Main Results:

• Successful introduction of plasmids pUB110 and pBC16 into B. sphaericus.
• Transformants expressed the antibiotic resistance genes encoded by the plasmids.
• Sporulation frequencies and larvicidal toxicities of transformants were comparable to the parent strain.
• Demonstrated stable maintenance of plasmids in B. sphaericus.

Conclusions:

• Protoplast transformation is an effective method for genetic transfer in Bacillus sphaericus.
• This study represents the first report of successful genetic transfer in B. sphaericus.
• The established method allows for the introduction of functional genes into B. sphaericus, opening avenues for further research and development.