Electrotransformation in Salmonella typhimurium LT2 - PubMed (original) (raw)
Electrotransformation in Salmonella typhimurium LT2
J Binotto et al. Can J Microbiol. 1991 Jun.
Abstract
Electroporation gives high efficiency of transformation in Salmonella typhimurium LT2, yielding 10(8)-10(9) electrotransformants per microgram of pBR322 DNA. Lipopolysaccharide (LPS) composition has little influence on electrotransformation efficiency by electroporation, unlike Ca2+ shock methods, which give ca. 10(6) transformants/microgram DNA with strains with Rc or Rd2 LPS, 10(4) transformants with most smooth and rough strains, and 10(2) transformants with strains with Re LPS. Thus cell envelope properties are less crucial in electrotransformation than in Ca2+ shock methods. The reciprocal restriction barrier between Escherichia coli K-12 and S. typhimurium LT2 reduces electrotransformation by ca. 100-fold, but host-restriction mutants reduce or eliminate the barrier.
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