Korean Journal of Food Science and Technology (한국식품과학회지)

Korean Society of Food Science and Technology (한국식품과학회)
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Effect of Sigma Factor ${\sigma}^{B}$ on Biofilm Formation of Listeria monocytogenes in High Osmotic and Low Temperature Conditions

고삼투압 및 저온 조건에서 sigma factor ${\sigma}^{B}$가 Listeria monocytogenes biofilm 생성에 미치는 영향

  • Park, Sang-Gyu (Division of Life and Environmental Science, Daegu University) ;
  • Park, Shin (Division of Life and Environmental Science, Daegu University)
  • 박상규 (대구대학교 생명환경학부) ;
  • 박신 (대구대학교 생명환경학부)
  • Published : 2004.06.30
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Abstract

Effects of sigma factor (${\sigma}^{B}$) on biofilm formation in Listeria monocytogenes 10403S and ${\sigma}^{B}-deficient$ sigB null mutant were studied under high osmotic and low temperature conditions. In brain heart infusion (BHI) medium containing 6% NaCl, wild type 10403S and ${\sigma}^{B}-deficient$sigB null mutant formed biofilms of $6.83{\pm}0.38\;and\;5.33{\pm}0.45\;log\;cfu/cm^{2}$, respectively. L. monocytogenes 10403S in BHI medium containing 6% NaCl formed 4.7 times larger biofilm than without NaCl. Culture of L. monocytogenes 10403S and sigB null mutant at $4^{\circ}C$ did not show any significant differences in biofilm formation. The results suggest biofilm formation is activated by ${\sigma}^{B}$ and NaCl, whereas not affected by low temperature stress in L. monocytogenes 10403S. More studies are necessary to determine biofilm formation mechanism in osmotolerant L. monocytogenes.

L. monocytogenes가 biofilm을 생성하는데 ${\sigma}^{B}$가 어떤 영향을 미치는가를 구명하기 위해 L monocytogenes wild type인 10403S와 ${\sigma}^{B}$를 제거한 sigB null mutant의 biofilm 생성능을 고삼투압 및 저온 조건에서 비교하였다. 고삼투압 조건인 6%의 NaCl이 첨가된 BHI 배지에서 배양된 L. monocytogenes 10403S는 배양 72시간 후 $6.83{\pm}0.38\;log\;cfu/cm^{2}$의 biofilm을 생성하였으며, sigB null mutant의 경우는 $5.33{\pm}0.45log\;cfu/cm^{2}$ 의 biofilm을 생성하였는데, L. monocytogenes 10403S가 sigB null mutant보다 31.8배나 많은 biofilm을 생성하였다. 또한 L. monocytogenes 10403S를 6%의 NaCl이 첨가된 BHI 배지에서 배양했을 시 NaCl을 첨가하지 않은 배지에서 배양한 경우보다 4.7배나 많은 biofilm을 생성하였는데, L. monocytogenes 10403S와 같이 ${\sigma}^{B}$가 존재하는 경우 고삼투압 조건에서 biofilm을 더욱 많이 생성하였으며, ${\sigma}^{B}$가 biofilm의 생성에 영향을 미친다고 할 수 있었다. 또한 저온 조건($4^{\circ}C$ 배양)에서 ${\sigma}^{B}$가 biofilm 생성에 영향을 미치는지를 조사하였는데, ${\sigma}^{B}$는 저온 스트레스 시 biofilm 생성에 영향을 미치지 않는 것으로 나타났다.

Keywords

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