Microbiology and Biotechnology Letters (한국미생물·생명공학회지)

The Korean Society for Microbiology and Biotechnology (한국미생물·생명공학회)
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Deletion Analysis of Pichia PGK1 Promoter and Construction of an Episomal Vector for Heterologous Protein Expression in P. pastoris

Pichia PGK1프로모터의 분석과 P. pastoris에 있어 외래단백질발현을 위한 Episomal벡터의 제조

  • Lee, Sung-Jae (Department of Bioengineering and Technology, Kangwon National University) ;
  • Hong, In-Pyo (Department of Bioengineering and Technology, Kangwon National University) ;
  • Baek, Seon-Yeol (Department of Bioengineering and Technology, Kangwon National University) ;
  • Choi, Shin-Geon (Department of Bioengineering and Technology, Kangwon National University)
  • 이성재 (강원대학교 생물공학과) ;
  • 홍인표 (강원대학교 생물공학과) ;
  • 백선열 (강원대학교 생물공학과) ;
  • 최신건 (강원대학교 생물공학과)
  • Published : 2007.09.28
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Abstract

Approximately 2.0 kb of the promoter region of the Pichia pastoris phosphoglycerate kinase gene (PGK1) was reduced to a 266 bp fragment and this minimized portion was used for construction of a new episomal constitutive expression vector in P. pastoris. As an approach to developing a constitutive expression vector in P. pastoris, the GAP promoter region of the Pichia expression vector pGAPZB was replaced with sequentially deleted PGK1 promoter fragments fused to a beta-galactosidase gene. When a lacZ gene was used as a reporter gene, PGK1 promoter strength was lower than that of the constitutive GAP promoter but it was higher than TEF1. We report here the development of the pPGKZ-E vector as a new episomal expression vector for heterologous gene expression by removing non-essential regions of the PGK1 promoter. This broadens the choice of episomal expression vectors for controlled constitutive expression in P. pastoris.

대략 2 kb의 크기를 가진 Pichia pastoris phosphoglycerate kinase gene (PGK1)의 프로모터부분을 266bp의 작은 크기로 최소화하여 P. pastoris에 있어 episomal의 새로운 항시적 발현벡터를 제조하였다. P. pastoris의 새로운 항시적 발현벡터를 개발하기 위하여 기존의 Pichia발현벡터인 pGABZB의 GAP프로모터부분을 연속적으로 일정 부분이 절단된 PGK1프로모터에 beta-galactosidase유전자가 결합된 부분으로 치환하였다. LacZ유전자를 reporter유전자로 사용하였을 때에 PGK1프로모터의 발현세기는 다른 항시적 프로모터인 GAP프로모터 보다는 낮았지만 TEF1프로모터 보다는 높았다. 본 논문에서 PGK1 프로모터의 불필요한 부분을 제거함으로서 Pichia에서 외래발현을 위한 새로운 episomal발현벡터인 pPGKZ-E를 제조하였으며 이 것은 P. pastoris에 있어 발현세기를 선택할 수 있는 발현벡터선택의 폭을 넓게 하였다.

Keywords

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