The development of papain which is extremely stable to anionic environment by directed molecular evolution

  • Kang, Whan-Koo (Department of Chemical Engineering, Hannam University, Gene to Protein, Inc.) ;
  • Kim, Hyoung-Sik (Department of Chemical Engineering, Hannam University) ;
  • Hwang, Sun-Duk (Department of Chemical Engineering, Hannam University) ;
  • Kim, Bum-Chang (Department of Chemical Engineering, Hannam University) ;
  • Son, Jeong-Il (Department of Chemical Engineering, Hannam University) ;
  • Lee, Byung-Ryul (Department of Chemical Engineering, Hannam University) ;
  • Lee, Chul-Woo (Department of Chemical Engineering, Hannam University) ;
  • Lee, Bheong-Uk (Department of Bilogical Science, Kosin University, Gene to Protein, Inc.)
  • 발행 : 2003.10.22

초록

본 연구에서 음이온에 안정한 파파인을 얻기 위한 방법으로 방향성분자진화을 이용하였다. 변이체를 선별하기 위한 방법으로는 skin milk agar plate에 음이온성 고분자 물질은 1%농도로 첨가하여 선명한 환이 형성되는 균주를 선별하였다. 이와 같은 방법으로 선별되어진 균주 P38-10을 SDS-PAGE gel로 발현을 확인하였고, 파파인의 정량 분석방법을 통하여 활성을 측정하였다. 개량형 파파인의 발현액에 음이온성 고분자 물질을 일정하게 첨가하여 매 5시간마다 활성을 측정하였다. 이결과 개량형 파파인의 경우 wild type에 비해 10-15배의 활성과 안정성을 유지하는 것으로 확인하였다.

In this study, development of papain which is extremely stable to negative ionic environment was made by directed molecular evolution. The screening method to confirm papain activity was designed using anionic material and skim milk agar plate for obtaining stable modified papain. Most stable modified papain P38-10 was obtained, which shows activity 10-15 times higher compared to wild type papain in anionic environment.

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