Abstract
Intact yeast cell Electrotransformation process was investigated. It is a two step process. The plasmid must be pre-mixed and present in contact with the cells during the pulse. During the millisecond field pulse, plasmid DNA is associated to the envelope. It therefore crosses the membrane by a process which lasts several seconds as shown by its sensitivity to a post pulse addition of DNase. Electrotransformation is not supported by an electrophoretic transfer due to the external field nor by a free diffusion across the electropermeabilized envelope. DNA is first bound during the field pulse and then is transferred by a still unknown active process due to cell metabolism.
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