Efficient electrotransformation of Enterococcus hirae with a new Enterococcus-Escherichia coli shuttle vector

Area of Science:

• Microbiology
• Molecular Biology
• Genetic Engineering

Background:

• Enterococcus hirae is a bacterium relevant in various contexts, but efficient genetic manipulation tools are limited.
• Developing effective methods for gene transfer and manipulation is crucial for understanding bacterial physiology and function.

Purpose of the Study:

• To construct and characterize a novel Enterococcus-Escherichia coli shuttle vector, designated pC3.
• To establish an efficient electroporation protocol for transforming Enterococcus hirae ATCC9790 using the pC3 vector.
• To assess the stability and utility of the pC3 vector for maintaining and manipulating foreign DNA in E. hirae.

Main Methods:

• Construction of the pC3 shuttle vector, combining elements from Enterococcus and E. coli.
• Optimization of electroporation conditions for high-efficiency transformation of E. hirae ATCC9790.
• Analysis of transformant stability without selective pressure.
• Restriction enzyme analysis of reisolated plasmid DNA to confirm integrity.
• Evaluation of the stable maintenance of chromosomal DNA fragments from E. coli or E. hirae via pC3.

Main Results:

• Achieved high transformation efficiency of 5 x 10^6 transformants per microgram of plasmid DNA in E. hirae ATCC9790.
• Demonstrated stable maintenance of the pC3 vector in E. hirae without the need for selective agents.
• Confirmed the integrity of the plasmid DNA after transformation and propagation.
• Showcased the stable maintenance of chromosomal DNA carried by pC3 in E. hirae.

Conclusions:

• The pC3 shuttle vector provides an efficient and stable system for genetic transformation of Enterococcus hirae.
• This development significantly enhances the feasibility of cloning and genetic manipulation in E. hirae.
• The pC3 vector represents a valuable tool for advancing research in Enterococcus biology and applications.