TITLE:
An Efficient Electro-Competent Cells Generation Method of Xanthomonas campestris pv. campestris: Its Application for Plasmid Transformation and Gene Replacement
AUTHORS:
Xiuli Wang, Daning Zheng, Rubing Liang
KEYWORDS:
Xanthomonas, Electro-Competent Cells, Electro-Transformation, Gene Replacement, Integration
JOURNAL NAME:
Advances in Microbiology,
Vol.6 No.2,
February
18,
2016
ABSTRACT: A simple and rapid method to prepare efficient electro-competent cells of Xanthomonas campestris pv. campestris was generated, with up to 100-fold transformation
efficiencies over the existing procedures. The overnight cultures were treated with
sucrose solution and micro-centrifuged at room temperature; the entire electro-competent
cells generation process can be completed in 15 minutes. It overcomes the complication
and time-consuming shortcomings of the traditional conjugation or electro-transformation
methods in this strain. Both the replicative plasmids and non-replicative plasmids
could be transformed or integrated efficiently using this method. And the DNA concentration,
cells growth stage, field strength and recovery time all had influences on the transformation
efficiency. In the optimal conditions, the transformation efficiency for the replicative
plasmids was 109 transformants per microgram DNA, and for non-replicative
plasmids was 150 transformants per microgram DNA. Further with the homology sequences,
two chromosomal target genes were deleted efficiently and the knockout strains were
obtained easily.