한국미생물·생명공학회지 (Microbiology and Biotechnology Letters)

  • 제32권4호
  • /
  • Pages.297-306
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  • 2004
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  • 1598-642X(pISSN)
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  • 2234-7305(eISSN)
한국미생물·생명공학회 (The Korean Society for Microbiology and Biotechnology)
권호 표지

넙치(Paralichthys olivaceus) HSP90$\beta$ 유전자의 분자생물학적 연구

Molecular Biological Studies on the Stress Protein HSP90$\beta$ Gene from Flounder (Paralichthys olivaceus)

  • Lee, Jae-Hyeong (Department of Microbiology, Pukyong National University) ;
  • Kim, Yeong-Tae (Department of Microbiology, Pukyong National University)
  • 발행 : 2004.12.01
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초록

열 충격단백질(Heat shock protein : HSP)은 온도 스트레스에 대하여 세포 내에서 발현되는 단백질이다. HSP의 중요 분류군의 하나가 HSP90 family 이다. 여러 종류의 포유동물과 조류에서 HSP 유전자 특성에 대한 연구가 많이 진행되었다. 본 연구에서는 넙치(Paralichthys olivaceus)로부터 제조한 넙치 뇌 cDNA 유전자 은행을 이용하여 넙치 HSP90 cDNA 유전자를 분리하여 구성 염기서열의 특성을 밝혀 내었다. 염기서열의 분석결과 넙치의 hsp90$\beta$ 유전자는 2,791 개의 뉴클레오타이드로 구성되어 있고, 726개의 아미노산 잔기가 암호화되어 있었다. 넙치 hsp90$\beta$ 유전자는 European sea bass와 96.6% zebrafish와 92.9%, Atlantic salmon와 92.0%, 그리고 사람과는 89.5%의 염기서열 상동성을 지니고 있었다. 또한 HSP90 아미노산 서열을 바탕으로 척추동물 종들과의 진화계통수를 구축하였다. 넙치 hsp90$\beta$ 유전자의 mRNA의 분포 정도를 RT-PCR를 이용하여 조사하였다. hsp90$\beta$ 유전자는 조사한 모든 조직(뇌, 간, 신장, 근육, 비장)에서 높은 수준으로 발현이 되고 있었다. 또한, 넙치 hsp90$\beta$ 단백질을 대량발현하기 위하여 대장균에서 발현을 유도하였다.

Heat shock proteins (HSPs) were induced in cells in the thermal stress, and the HSP90 family is one of the major classes of HSPs. Gene encoding HSPs have been characterized from various mammals and piscine. We have cloned and sequenced the HSP90 cDNA from a brain cDNA library constructed from flounder (Paralichthys oliThe result of sequence analysis shows it to be the HSP90~. The nucleotide sequence of the HSP90$\beta$ was composed of 2791 long, encoding 726 amino acid residues. The flounder hsp90$\beta$ gene showed very high sequence homology with hsp90f3 of European sea bass (96.6%), zebrafish (92.9%), Atlantic salmon (92.0%) and human (89.5%). We also constructed a phylogenetic tree based on HSP90 amino acid sequences from vertebrate species. Gene-specific primers were selected and used in RT-PCR reactions to measure the basal hsp90$\beta$ mRNA. The hsp90f3 gene is constitutively expressed at a fairly high level in all examined tissues (brain, liver, kidney, muscle, and spleen). In order to express protein of flounder hsp90$\beta$ in E. coli, we used the His-tagged pETvector. Then, the expression of flounder HSP90$\beta$ was confirmed by Western blot analysis.

키워드

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