African Journal of
Microbiology Research

  • Abbreviation: Afr. J. Microbiol. Res.
  • Language: English
  • ISSN: 1996-0808
  • DOI: 10.5897/AJMR
  • Start Year: 2007
  • Published Articles: 5233

Full Length Research Paper

Mutation of plcR gene using a novel gene knock-out system in Bacillus cereus

Zhen Xie1, Yingying He1, Fenghu Xiao1, Liqin Zhang1,2, Yongjun Wang1,2*
1Department of Forest Protection, School of Forestry and Biotechnology, Zhejiang Agricultural and Forestry University, Lin’ an, 311300, China. 2Zhejiang Provincial Engineering Laboratory of Biopesticide Preparation, Lin’an, 311300, China.
Email: [email protected]

  •  Accepted: 19 April 2013
  •  Published: 23 April 2013


Mutagenesis is an essential way to dissect gene’s physiological functions and characterizations in vivo. In this paper, a novel vector designated pAK12 was constructed for generating gene inactivation mutant in gram-positive Bacillus cereus. By using two-step strategy, a plcR gene knock-out mutant in B. cereus 1N21 was obtained without antibiotic resistance gene inside. The genetic evidences and phynotypic differences confirmed plcR gene was disrupted and inactivated in B. cereus 1N21. Biofilm formation in exopolysaccharide (EPS) by the plcR mutant was about four times higher than that by the wild-type strain. This novel gene knock-out system could be used for genetic mutagenesis in gram-positive bacterium efficiently.


Key words: Bacillus cereus, allele exchange mutagenesis, pleiotropic regulator.