World Journal of Microbiology and Biotechnology

, Volume 30, Issue 7, pp 2091–2099

Detection of induced synthesis of colicin E9 using ColE9p::gfpmut2 based reporter system

  • Shaista Bano
  • Mireille Vankemmelbeke
  • Christopher N. Penfold
  • Richard James
Original Paper


The majority of colicin operons are regulated by an SOS response inducible promoter (SOS promoter), located at upstream of the colicin operons. Therefore, colicin synthesis is induced by DNA damaging agents like mitomycin C (MMC) because the resulting DNA damage switches on the SOS response in bacteria. In this study, we have described the strategy for fusion of the SOS promoter of the colicin E9 operon (ColE9p) with a promoterless green fluorescent reporter gene (gfpmut2). We observed that the ColE9pgfpmut2 is inducible by MMC which confirmed that the ColE9pgfpmut2 is sensitive to SOS response inducing agents. The data implies that the ColE9pgfpmut2 based reporter system is suitable for monitoring the ColE9 synthesis induced by SOS response inducing agents including antibiotics. Using green fluorescent protein expression from the ColE9pgfpmut2 as an indicator of ColE9 synthesis; we have investigated, first time, the inducing effects of cephalexin antibiotic on ColE9 synthesis. Our data demonstrated that the cephalexin has potential to induce ColE9 synthesis from E. coli JM83 host cells albeit the level of this induction is very low hence its detection required a highly sensitive method.


Colicin E9 SOS promoter Fluorescent reporter gene Cephalexin 


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Copyright information

© Springer Science+Business Media Dordrecht 2014

Authors and Affiliations

  • Shaista Bano
    • 1
    • 2
  • Mireille Vankemmelbeke
    • 1
  • Christopher N. Penfold
    • 1
  • Richard James
    • 1
  1. 1.School of Life Sciences, Centre for Biomolecular SciencesUniversity of NottinghamNottinghamUK
  2. 2.Department of MicrobiologyUniversity of SindhJamshoroPakistan

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