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Saccharomyces cerevisae에서 한국산 겨우살이 유래 lectin A 및 B 유전자의 발현

Expression of Recombinant Korean Mistletoe(KM) Lectin and B genes in Saccharomyces cerevisiae

  • 최윤혁 (한동대학교 생명공학연구소) ;
  • 김종배 (한동대학교 생명공학연구소) ;
  • 양웅석 ((주)미술 바이오텍) ;
  • 황철원 (한동대학교 생명공학연구소)
  • 발행 : 2004.10.01

초록

본 연구는 한국산 겨우살이 lectin유전자 (A 및 B chain) 을 효모 (Saccharmyces cerevisiae) 에 형질 전환시키는 시스템을 사용한 것으로, 효모내 효과적인 lectin유전자 발현을 위하여 유전자 상에 Kozak translation initiation sequence를 PCR을 이용 삽입, 변형시켜 재 클로닝 하였다. 변형된 lectin A 및 B 유전자를 포함하는 재조합 플라스미드는 S. cerevisiae INVSc (MATa, his3 $\Delta$l, leu2, trpl-289, ura3-52) 에 형질전환 되었다. 형질전환된 효모는 ABI 3700 system을 이용한 DNA 염기서열 분석을 통해 확인되었고 재조합 한국산겨우살이 lectin 발현을 위해 2% galactose를 사용하여 유도발현되었다. 재조합 lectin A 및 B 단백질은 SDS-PACE 및 western blotting 분석을 수행한 결과 약 29kDa 크기로 확인되었다. 재조합 lectin은 세포내 가용성 단백질 1mg중 1.24∼l.75 $\mu\textrm{g}$ 수준으로 발현되어짐을 ELISA 분석을 통해 확인하였다. 한편 lectin 유전자는 galartose 유도발현 후 36시간이 되 었을 때 발현량이 최대가 되었으며 lectin A 유전자의 경우 48 시간 이후에는 발현이 억제되었다.

참고문헌

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