YK
Yuko Konishi
  • Department of Biochemistry, Aichi Medical University School of Medicine, Japan
Research fields
  • Molecular biology
Induction of Natural Competence in Genetically-modified Lactococcus lactis
Authors:  Joyce Mulder, Michiel Wels, Oscar P. Kuipers, Michiel Kleerebezem and Peter A. Bron, date: 07/05/2018, view: 6573, Q&A: 0
Natural competence can be activated in Lactoccocus lactis subsp lactis and cremoris upon overexpression of ComX, a master regulator of bacterial competence. Herein, we demonstrate a method to activate bacterial competence by regulating the expression of the comX gene by using a nisin-inducible promoter in an L. lactis strain harboring either a chromosomal or plasmid-encoded copy of nisRK. Addition of moderate concentrations of the inducer nisin resulted in concomitant moderate levels of ComX, which led to an optimal transformation rate (1.0 x 10-6 transformants/total cell number/g plasmid DNA). Here, a detailed description of the optimized protocol for competence induction is presented.
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