The Korean Journal of Malacology (한국패류학회지)

The Malacological Society of Korea (한국패류학회)
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Molecular Characterization and Expression Analysis of a Glutathione S-Transferase cDNA from Abalone (Haliotis discus hannai)

북방전복 (Haliotis discus hannai)에서 분리한 Glutathione S-transferase 유전자의 분자생물학적 고찰 및 발현분석

  • 문지영 (국립수산과학원 전략양식연구소 생명공학과) ;
  • 박은희 (국립수산과학원 전략양식연구소 생명공학과) ;
  • 공희정 (국립수산과학원 전략양식연구소 생명공학과) ;
  • 김동균 (국립수산과학원 전략양식연구소 생명공학과) ;
  • 김영옥 (국립수산과학원 전략양식연구소 생명공학과) ;
  • 김우진 (국립수산과학원 전략양식연구소 생명공학과) ;
  • 안철민 (국립수산과학원 전략양식연구소 생명공학과) ;
  • 남보혜 (국립수산과학원 전략양식연구소 생명공학과)
  • Received : 2014.12.01
  • Accepted : 2014.12.24
  • Published : 2014.12.31
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Abstract

Glutathione S-transferases (GSTs) are a superfamily of detoxification enzymes that primarily catalyze the nucleophilic addition of reduced glutathione to both endogenous and exogenous electrophiles. In this study, we isolated and characterized a full-length of alpha class GST cDNA from the abalone (Haliotis discus hannai). The abalone GST cDNA encodes a 223-amino acid polypeptide with a calculated molecular mass of 25.8 kDa and isoelectric point of 5.69. Multiple alignments and phylogenetic analysis with the deduced abalone GST protein revealed that it belongs to the alpha class GSTs and showed strong homology with disk abalone (Haliotis discus discus) putative alpha class GST. Abalone GST mRNA was ubiquitously detected in all tested tissues. GST mRNA expression was comparatively high in the mantle, gill, liver, and digestive duct, however, lowest in the hemocytes. Expression level of abalone GST mRNA in the mantle, gill, liver, and digestive duct was 182.7-fold, 114.8-fold, 4675.8-fold, 406.1-fold higher than in the hemocytes, respectively. Expression level of abalone GST mRNA in the liver was peaked at 6 h post-infection with Vibrio parahemolyticus and decreased at 12 h post-infection. While the expression level of abalone GST mRNA in the hemocytes was drastically increased at 3 h post-infection with Vibrio parahemolyticus. These results suggest that abalone GST is conserved through evolution and may play roles similar to its mammalian counterparts.

본 연구에서는 북방전복 (Haliotis discus hannai)의 대용량 염기서열 분석을 통해 GST유전자의 전장 cDNA를 동정하였다. 북방전복 GST 유전자의 총 길이는 1669 bp로 672 bp의 ORF는 총 223개의 아미노산을 코딩하고 있으며 등전점은 5.69, 분자량은 25.8 kDa으로 예측되었다. 북방전복 GST아미노산 서열은 둥근전복과 지중해 담치와 같은 패류의 GSTA와 가장 유사성이 높았으며 계통수 분석을 통해 GSTA와 하나의 그룹을 이루었다. 북방전복 GST에는 GSTA의 특징을 갖는 두 site (N-말단의 G-site, C-말단의 H-site)가 보존되어 있었고 효소활성과 구조 유지에 중요한 잔기가 종간에 매우 보존되어 있었다. 북방전복 GST 유전자의 mRNA는 관찰된 모든 조직에서 발현하고 있었으며, 특히 외투막, 아가미, 간췌장, 소화관에서 높은 발현이 확인되었다. 북방전복의 GST는 비브리오균을 인위감염 시킨 전복의 간췌장에서 감염 후 1시간 뒤 발현이 급격히 증가했다가 3시간까지 증가한 뒤 감소하였고, 혈구세포에서는 감염 3시간 경과 후 발현 정도가 최고로 증가했다가 감소하였다. 따라서 북방전복 GST는 alpha class GST의 특징을 가지며 병원체 감염에 따른 면역반응 조절에 관여할 것이라 생각되며 병원균 감염에 따른 바이오마커로 활용가능 할 것이라 예상된다.

Keywords

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