Difference between revisions of "Lactobacillus transformation (Kim 2005)"

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Electrotransformation procedure for ''Lactobacillus acidophilus''
Electrotransformation procedure for ''Lactobacillus acidophilus'', ''Lactobacillus brevis'', and ''Lactobacillus helveticus''.

Revision as of 15:09, 18 April 2011

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Electrotransformation procedure for Lactobacillus acidophilus, Lactobacillus brevis, and Lactobacillus helveticus.


  1. Prepare Electrocompetent cells
    1. Inoculate overnight culture at 10^6 CFU/ml in MRS containing 1% glycene
    2. Harvest at early-log phase (OD660 0.2-0.3)
    3. chill on ice for 10 minutes
    4. wash twice in cold washing buffer (5 mmol 1^-1 sucrose, 3 mmol 1^-1 MgCl2, pH 7.4)
    5. Use cells within 30 minutes
  2. Electroporation
    1. add 1 ul of plasmid DNA to 50 ul (w/ 10^8 CFU/ml) of ice-cold cell suspension in a .2 cm cuvette
    2. electroporate - 12.5 kV/cm, pulse number of 10, puse interval of 500 ms, plasmid DNA concentration of 25 ng/ul
    3. dilute cell suspension to 1 ml in MRS broth and incubate at 37C for 3 h
    4. plate bacteria onto MRS agar plates with 3 ug ml^-1 chloramphenicol
    5. incubate under anaerobic conditions


Please feel free to post comments, questions, or improvements to this protocol. Happy to have your input!

*Derek Ju 04:44, 29 October 2008 (EDT):used plasmid pNZ123, works with L. acidophilus strains 43121, 4356, NCFM, 30SC, A4, 107A, GP4A; L. helveticus KU107; L. brevis 3102

Please sign your name to your note by adding '''*~~~~''': to the beginning of your tip.


Relevant papers and books

Kim et al (Journal of App. Microbio. 2005, 99, 167-174)


  • Derek Ju (derekju [at] mit.edu)

or instead, discuss this protocol.