Lactobacillus transformation (Berthier 1996)

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Overview

General guidelines for the electro-transformation of Lactobacillus sake as described by Berthier et al. and as used by Alegre et al. with Lactobacillus plantarum.

Materials

• 50 ul of L.plantarum competent cells
• In vitro modified plasmid DNA
• MRS media + antibiotic
• Stock solution of MgCl₂
• Stock Solution of Glucose
• Electroporation Buffer (0.5M Sucrose, 10% Glycerol)

Procedure

1. Ensure that the In vitro modification of DNA for L. plantarum protocol has been followed.
2. Thaw 50μL of competent cells on ice from aliquots in -80°C freezer.
3. Add between 1 ng and 3 ug of plasmid DNA in 5 ul of TE buffer to 50 ul of freshly prepared competent cells and transfer to prechilled cuvette for electroporation (interelectrode distance 1 mm).
4. Electroporation done at 13 Kv cm-1 (time constant: 2-4 ms), Set electroporation machine to 25μF and 200 Ω.
5. Add 500 ul of MRS media containing 80mM MgCl₂ and 55mM Glucose
6. Incubate for 2 hours at 30°C.
7. Plate cells on MRS plates + antibiotic resistance.

Notes

All questions, input and feedback are welcome!

References

Berthier, F., Zagorec, M., Champomier-Verge`s, M., Ehrlich, S.D. and Morel-Deville, F. (1996) Efficient transformation of Lactobacillus sake by electroporation. Microbiology 142, 1273–1279.

Alegre et al. (FEMS Microbiology Letters 241 (2004) 73–77)

Contact

• morto077@uottawa.ca

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