High efficiency transformation of E.coli by high voltage electroporation

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ID: 290206
1988
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Abstract
E. coli can be transformed to extremely high efficiencies by subjecting a mixture of cells and DNA to brief but intense electrical fields of exponential decay waveform (electroporation). We have obtained 10(9) to 10(10) transformants/micrograms with strains LE392 and DH5 alpha, and plasmids pUC18 and pBR329. The process is highly dependent on two characteristics of the electrical pulse: the electric field strength and the pulse length (RC time constant). The frequency of transformation is a linear function of the DNA concentration over at least six orders of magnitude; and the efficiency of transformation is a function of the cell concentration. Most of the surviving cells are competent with up to 80% transformed at high DNA concentration. The mechanism does not appear to include binding of the DNA to the cells prior to entry. Possible mechanisms are discussed and a simple procedure for the practical use of this technique is presented.
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Authors William J. Dower, Jeff F. Miller, Clifton W. Ragsdale
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Journal Nucleic Acids Research
Year 1988
DOI
10.1093/nar/16.13.6127
URL
https://doi.org/10.1093/nar/16.13.6127
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