( ...)Kluyveromyces lactis

Multiporator / Electroporator 2510 Transformation Protocol Protocol No. 4308 915.516 12/2001 Microorganism Kluyveromyces lactis AWJ137 Cell type Yeast Molecules injected DNA Growth medium Not given Washing solution YPD, 10 mM DTT, 40 mM HEPES (pH 8.0) Electroporation solution 2.5 mM Tris/HCl, 1 mM MgCl₂, (pH 8.0) Outgrowth medium YPD with 1 M sorbitol Cuvette 4 mm gap width Reference Prof. Friedhelm Meinhardt Universitt Mnster Corrensstr. 3 D-48149 Mnster
e-mail: meinhar@uni-muenster.de Making electrocompetent cells:

1. Grow a 50 ml cell culture of Kluyveromyces lactis to a density of 5 x 10⁷ cells/ml. 2. Harvest by centrifugation (5 min., at 4,000 x g) 3. Resuspend cells in 5 ml washing solution and incubate for 5 min. 4. Wash twice with electroporation solution and resuspend in 0.25 ml of the same solution. Incubate for 1 hour on ice.

Electroporation of cells:

1. Add 5 l DNA (1 g/l) to 100 l of electrocompetent cells. Homogenize by gently mixing with pipette several times. Transfer mixture into a prechilled cuvette.
2. Wipe moisture from the cuvette and insert the cuvette into the device.
3. Electroporation:
   
   Mode Prokaryotes O Voltage (V) 2,500 V Time constant (T) 5 ms
   
4. Add 1 ml YPD medium with 1 M sorbitol, incubate for 1 hour at 30 C.
5. Centrifuge cells 30 sec., resuspend in 0.4 ml sterile water, plate in aliquots on selective plates.

Expected results: Transformation efficiency up to 200 transformants/g of DNA.


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