Abstract
A prerequisite for genetic studies of Arthrobacter is a high efficiency transformation system that allows for DNA transfer, transposon mutagenesis, and expression of specific genes. In this study, we develop a detailed electroporation method through a systematic examination of the factors involved in the entire electroporation process. Key features of this procedure, including the addition of penicillin to cells during the early log phase of growth and the presence of 0.5 M sorbitol in the electroporation and recovery media, produced the greatest increases in transformation efficiency and consistency of results. The transformation rate also varied depending on the electrical parameters, DNA concentration, and recovery time period. Using optimum conditions, we generally achieved an efficiency of 6.8 × 10 7 transformants per microgram of PART2 for Arthrobacter sp. A3. This protocol was also successfully applied to other Arthrobacter species. Therefore, we conclude that the proposed method is rapid, simple and convenient, which allows a transformation trial to be accomplished in minutes.
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