Transformation of Escherichia coli by Electroporation

Abstract

Preparing electrocompetent bacteria is considerably easier than preparing cells for transformation by chemical methods. Bacteria
are simply grown to mid-log phase, chilled, centrifuged, washed extensively with ice-cold buffer or H2O to reduce the ionic strength of the cell suspension, and then suspended in an ice-cold buffer containing 10% glycerol. DNA
may be introduced immediately into the bacteria by exposing them to a short high-voltage electrical discharge. Alternatively,
the cell suspension may be snap-frozen and stored at −70°C for up to 6 mo before electroporation, without loss of transforming
efficiency.

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