Korean Journal of Microbiology (미생물학회지)

The Microbiological Society of Korea (한국미생물학회)
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Cloning and Nucleotide Sequence Analysis of the asd Gene from Shigella sonnei KNIH104S

Shigella sonnei KNIH104S로부터 asd 유전자의 클로닝 및 염기서열 분석

  • Published : 1999.03.01
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Abstract

Shigella sonnez is important causes of human enleric infcctions. S. sonnei KNIH104S was isolated from patient of shigellosis in Korea and previously reported. We cloned 1.7 kb BamHI fragment containing the asd gene encoding an aspartate $\beta$-semialdehyde dehydrogenase from chromosomal DNA of S. sonnei KNIH104S. This recombinant plasmid was named as pSAB17. E. coli $\chi$6097, an a d mutant, cannol grow on the LB medium without DL-$\alpha$, $\varepsilon$-diaminopimclic acid (50 pgiml) but E. coli x 6097(pSAB17) can grow on the same medium. We sequenccd the asd gene ol Shigella for the first time. The asd gcne was composed of 1,104 base pairs with ATG initiation codon and TAA termination codon. Sequence comparison of the asd gene exhibited 99.9% nucleolide sequence hornology with that of E. coli. Also, We constructed the balanced-lethal vector using pBluescrip SK(+) and asd gene of S. sonnei KNIH104S.

Shigella sonnei 는 인체의 장내 감염을 일으키는 병원균의 일종이며, 본 연구에 사용된 S.sonnei KNIH104S는 국내에서 쉬겔라증을 나타내는 환자로부터 분리하였다. S. sonnei KNIH104s의 염색체로부터 aspartate $\beta$-semial-dehyde dehydrogenase를 암호화하는 asd 유전자를 포함하는 1.7 kb BamHI 절편을 pBluescript SK(+) 벡터를 이용하여 클로닝하였으며 pSAB17이라 명명하였다. asd 결실돌연변이주인 E.coli $\chi$6097은 세포벽을 구성하는 중요한 성분인 DL-$\alpha$, $\varepsilon$-diaminopimelic acid가 없는 Luria-Bertani 배지에서 생장함을 확인하였다. 클로닝된 asd 유전자의 염기서열 분석결과 ATG 개시코돈 및 TAA 종결코돈을 지니는 1,104 bp 로 이루어져 있으며, 여기서 유추한 아미노산은 367개로 분자량 40.0 kDa 의 폴리펩타이드를 만들어내고 있다. 염기서열은 대장균의 asd 유전자와 한 부위에서 다르게 나타났지만 아미노산의 서열은 동일함을 알 수 있었다. 그리고 pBluescript SK(+) 벡터와 본 연구에서 클로닝된 asd 유전자를 이용하여 balanced-lethal vector인 pSKA47 및 pSKA47A를 제조하였다.

Keywords

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