The Korean Journal of Mycology (한국균학회지)

The Korean Society of Mycology (한국균학회)
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Cloning of a Gene Involved in Biosynthesis of ${\beta}-1,3-glucan$ in Saccharomyces cerevisiae

베타-1,3-글루칸 생합성에 관여하는 Saccharomyces cerevisiae 유전자의 클로닝

  • Jin, Eun-Hee (Department of Microbiology, Chungnam National University) ;
  • Lee, Dong-Won (Department of Microbiology, Chungnam National University) ;
  • Kim, Jin-Mi (Department of Microbiology, Chungnam National University) ;
  • Park, Hee-Moon (Department of Microbiology, Chungnam National University)
  • 진은희 (충남대학교 자연과학대학 미생물학과) ;
  • 이동원 (충남대학교 자연과학대학 미생물학과) ;
  • 김진미 (충남대학교 자연과학대학 미생물학과) ;
  • 박희문 (충남대학교 자연과학대학 미생물학과)
  • Published : 1995.06.30
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Abstract

DNA fragment being able to restore in vitro activity of ${\beta}-1,3-glucan$ synthase was cloned by transformation of the Saccharomyces cerevisiae LP353 mutant strain with genomic library constructed in the YCp50. For the selection of transformants which showed no detectable phenotype linked to recovery of the defect in ${\beta}-1,3-glucan$ synthase activity, the colony autoradiography was succesfully applied. The restriction map of the cloned DNA fragment, which is 8.5-kb in length, was constructed. Both the YEplac195 and the YCp50 carrying the 8.5-kb fragment increased ${\beta}-1,3-glucan$ synthase activity of LP353 by two fold. Neither the YEplac195 nor the YCp50 carrying the 8.5-kb DNA fragment, however, complemented the temperature-dependent osmotic sensitivity which is another distinctive phenotype of LP353. Subcloning experiments indicated that a functional region was located in 4.8-kb BglII-KpnI fragment. The 4.8-kb fragment was also able to increase the level of ${\beta}-1,3-glucan$ content in cell wall as well as the resistance of cells to cell wall lytic enzyme, ${\beta}-1,3-glucanase$. The growth rate of the LP353 with 4.8-kb fragment was almost same as that of wild type strain in liquid medium with 1.2 M sorbitol at nonpermissive temperature. Taken these results together, the 4.8-kb fragment seemed to contain the BGS2 gene for ${\beta}-1,3-glucan$ synthase activity in yeast S. cerevisiae.

비허용온도인 $37^{\circ}C$에서 삼투감수성을 보이며 베타-1,3-글루칸 합성능이 현저히 손상된 Saccharomyces cerevisiae mutant(LP353)를 YCp50으로 제조한 yeast genomic library로 형질전환시킨 후, 콜로니 자기방사법으로 형질전환체의 선별을 시도한 결과, LP353의 베타-1,3-글루칸 합성능을 부분적으로 회복시켜 주는 약 8.5-kb 크기의 DNA 절편을 클로닝하는데 성공하였다. 클로닝된 8.5-kb의 DNA 절편은 copy 수에 무관하게 LP353의 또 다른 표현형질인 온도의존적 삼투감수성은 회복시켜 주지 못하였으나, 세포벽의 베타-1,3-글루칸 함량과 베타-1,3-글루칸 분해효소인 ${\beta}-glucanase$에 대한 내성은 copy수에 무관하게 증가시켜 주었다. 한편, 8.5-kb의 DNA 절편은 $37^{\circ}C$의 삼투안정제가 첨가된 액체배지에서 잘 자라지 못하는 LP353의 돌연변이 형질을 회복시켜 야생형의 수준에 근접하는 생장양상을 보여 주었다. 이상의 결과로 클로닝된 8.5-kb 크기의 DNA 절편은 S. cerevisiae의 베타-1,3-글루칸 생합성에 관여하는 유전자의 하나인 BGS2를 포함하고 있는 것으로 보여지며, subcloning을 통한 기능부위 분석 결과, 4.8-kb 크기의 BglII-KpnI DNA 절편에 BGS2가 존재하는 것으로 추정되었다.

Keywords

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