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Improved electroporation and cloning vector system for gram-positive bacteria.
G M Dunny1, L N Lee, D J LeBlanc
1Department of Microbiology, New York State College of Veterinary Medicine, Cornell University, Ithaca 14853.
Applied and Environmental Microbiology
|April 1, 1991
Summary
A new electroporation protocol enhances Enterococcus faecalis transformation efficiency. This method, using specific growth and electroporation solutions, achieves high transformation rates for E. faecalis and other bacteria.
Area of Science:
- Microbiology
- Molecular Biology
- Genetic Engineering
Background:
- Efficient genetic manipulation of Enterococcus faecalis is crucial for understanding its biology and developing biotechnological applications.
- Existing transformation methods for Gram-positive bacteria like E. faecalis often suffer from low efficiency and limited applicability.
Purpose of the Study:
- To develop and optimize a robust electroporation protocol for efficient transformation of intact Enterococcus faecalis cells.
- To construct and validate a novel shuttle cloning vector for use in conjunction with the developed electroporation system.
Main Methods:
- Systematic optimization of growth conditions, electroporation solution composition, and electroporation parameters (field strength, resistance).
- Evaluation of DNA size, concentration, and purity, along with selection conditions for transformants.
- Construction of a new Escherichia coli-Streptococcus and Enterococcus shuttle cloning vector (pDL276) with key features for cloning and expression.
Main Results:
- Achieved transformation frequencies greater than 2 x 10^5 transformants per microgram of plasmid DNA for E. faecalis.
- Demonstrated successful transformation of streptococci and Bacillus anthracis at frequencies of 10^3 to 10^4 transformants per microgram.
- Successfully cloned various enterococcal and streptococcal DNA sequences, including those difficult to clone previously, using the novel vector and electroporation system.
Conclusions:
- The developed electroporation protocol significantly enhances transformation efficiency in E. faecalis and related bacteria.
- The novel shuttle vector pDL276 is effective for cloning and manipulation of DNA in both E. coli and Gram-positive hosts.
- This combined system provides a powerful tool for genetic engineering of E. faecalis and other important bacterial species.