Transformation of a Methylotrophic Bacterium, Methylobacterium extorquens, with a Broad-Host-Range Plasmid by Electroporation.
An efficient method for the transformation of the methylotrophic bacterium Methylobacterium extorquens NR-2 with a broad-host-range plasmid, pLA2917, by electroporation was examined. Transformants of M. extorquens NR-2 expressing resistance to kanamycin were obtained after electric pulse. These transformants were found to harbor a single plasmid which was electrophoretically identical and homologous to pLA2917 obtained from Escherichia coli. Several factors which determined the transformation efficiency were optimized, resulting in a transformation efficiency of up to 8 x 10 transformants per mug of plasmid DNA by 10 pulses at a field strength of 10 kV/cm and a pulse duration of 300 mus.
Ueda
S
S
Laboratory of Bioreaction Engineering, Department of Food Science and Technology, School of Agriculture, Nagoya University, Chikusa-ku, Nagoya 464-01, Japan.
Matsumoto
S
S
Shimizu
S
S
Yamane
T
T