Heterologous Expression of Human $\beta$-Defensin-1 in Bacteriocin-Producing Laetoeoeeus lactis

  • CHOI HAK JONG (Gwen Knapp Center for Lupus and Immunology Research, Committee on Immunology and Department of Pathology, University of Chicago) ;
  • SEO MYUNG JI (Bioproducts Research Center, Yonsei University) ;
  • LEE JUNG CHOUL (Department of Biotechnology, Yonsei University) ;
  • CHEIGH CHAN ICK (Department of Biotechnology, Yonsei University) ;
  • PARK HOON (Division of Applied Biological Sciences, Sunmoon University) ;
  • AHN CHEOL (Program of Molecular Biotechnology, Division of Biotechnology, Kangwon National University) ;
  • PYUN YU RYANG (Department of Biotechnology, Yonsei University)
  • Published : 2005.04.01

Abstract

Lactococcus lactis A164 is a nisin Z-producing strain isolated from kimchi. Its antimicrobial spectrum has been found to be active against most Gram-positive bacteria tested, yet inactive against Gram-negative bacteria [3]. Accordingly, to overcome this drawback, the current study attempted to express human $\beta$-defensin-l (hBD-l), which kills both Gram-positive and Gram-negative bacteria in L. lactis AI64. When the hBD-l cDNA was introduced using a nisin Z-controlled expression cassette, the L. lactis A164 transformants grew very poorly, due to the bactericidal effect of the expressed hBD-l against the transformants. Therefore, a gene fusion system was designed to reduce the toxicity of the expressed heterologous protein against the host cells. As such, the hBD-l gene was fused to the DsbC- Tag of pET -40b(+), then introduced to L. lactis A 164. The transformants expressed an intracellular 35.6-kDa DsbC-hBD-l fusion protein that exhibited slight activity against the host cells, yet not enough to strongly inhibit the cell growth. To obtain the recombinant hBD-l, the DsbC-hBD-l fusion protein was purified by nickel-affinity column chromatography, and the DsbC-Tag removed by cleaving with enterokinase. The cleaved mature hBD-l exhibited strong bactericidal activity against E. coli JM109, indicating that the recombinant L. lactis A 164 produced a biologically active hBD-I. In addition, the recombinant L. lactis A 164 was also found to produce the same level of nisin Z as the wild-type.

Keywords

References

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