Journal of Life Science (생명과학회지)

Korean Society of Life Science (한국생명과학회)
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Regulation of stf Operon Expression and Its Virulence

살모넬라가 발현하는 stf 오페론의 조절과 병원성 인자로서의 기능

  • Kim Sam-Woong (Division of Biological Sciences, Pusan National University) ;
  • Kim Young-Hee (Division of Biological Sciences, Pusan National University) ;
  • Kang Ho-Young (Division of Biological Sciences, Pusan National University)
  • 김삼웅 (부산대학교 생명과학부 미생물학과) ;
  • 김영희 (부산대학교 생명과학부 미생물학과) ;
  • 강호영 (부산대학교 생명과학부 미생물학과)
  • Published : 2005.08.01
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Abstract

The stf (Salmonella typhimurium fimbriae) operon consisting of stfA(CDEFG assumes to encode putative fimbriae. The complete stf operon is existed in S. typhimurium and S. choleraesuis, whereas it is absent in S. typhi. Analyses of the amino acid residues between major subunit StfA of the Stf fimbriae and those of known other fimbriaes suggested that Stf belongs to class I type fimbriae. Through comparison of StfD chaperone with the other fimbrial chaperones, and of C-terminus in subunits of Stf fimbriae, it belongs to FGS (with a short Fl-G1 loop) subfamily. In order to investigate the expression of stf operon, we have constructed a Salmonella strain containing a chromosomal stfA::lacZYA transcriptional fusion, resulting in S. typhimurium $_X8532$. The strain $_X8532$ lacked the expression of \beta-galactosidase$ under normal culture conditions. However, with longer incubation time of the S. typhimurium $_X8532$, we have isolated 21 individual strains exhibiting $Lac^+$ phenotype. $Lac^+$ phenotype was appeared as approximately 0.03 frequency per generation. All isolates expressed lacZ constitutively in the various environmental conditions. Various global regulatory proteins including RpoS, OmpR, and CpxR were not involved in the regulation of the stf operon. A S. typhimurium $_X8661$ mutant lacking stfAC function attenuated 6.7 folds more than that of wild type $_X3761$ in the mouse virulence test, suggesting in the somehow involved in the Salmonella pathogenesis.

stf 오페론은 stfA CDEFG로 구성되며, S. typhimurium과 S. choleraesuis에서는 완전하게 존재한다. 그러나 S. typhi에서는 이 오페론이 결여되어 있고 S. paratyphi A에서는 stfC의 유전자가 돌연변이 되어 있다. 이 섬모는 class 1형태의 섬모로 분류되며, StfD chaperone을 다른 섬모를 구성하는 chaperone들과 비교할 때 각 subunit들의 C-말단 잔기의 분석은 StfD chaperone이 FGS subfamily와 유사한 특성을 보였다. stf 오페론이 lacZYA 유전자와 fusion된 S. typhimurium 돌연변이 균주를 사용하여 MacConkey 고체배지에서 장시간 배양한 후 $Lac^+$ 표현형을 보이는 21 isolate들을 분리하였다. $Lac^+$ 균주들은 34 세대 당 $0.28\~1.75$의 빈도로 발생하였다. 21 isolate들은 구성적으로 stf operon을 발현했지만, 범용의 조절자인 RpoS, OmpR, CpxR등에 의해 조절되지 않았다. Mouse독성 실험에서 S. typhimurium $_X8661$은 야생형인 $_X3761$에 비교하여 6.7배의 약독화를 보였다.

Keywords

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