Korean Journal of Microbiology (미생물학회지)

The Microbiological Society of Korea (한국미생물학회)
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Isolation and Analysis of the Yeast Mutant Gene, soo1-1, which Confers the Defect in $\beta$-1,3-glucan Biosynthesis

효모의 베타-1,3-글루칸 생합성 결함을 초래하는 돌연변이 유전자(soo1-1)의 분리 및 분석

  • 이재준 (충남대학교 자연과학대학 미생물학과) ;
  • 이동원 (충남대학교 자연과학대학 미생물학과) ;
  • 김기현 (충남대학교 자연과학대학 미생물학과) ;
  • 박희문 (충남대학교 자연과학대학 미생물학과)
  • Published : 2001.03.01
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Abstract

Allele rescue and sequence analysis of soo1-1 allele in Saccharomyces cerevisiae mutant LP0353 revealed that soo1-1 is identical to the previously reported ret1-1 allele, which has a base substitution of A for $G^{681}$ leading to an amino acid substitution of aspartic acid for $glycine^{227}$ in Soolp. However, it was revealed that the addition of osmotic stabilizer, such as 1.2M sorbitol can rescue the temperature sensitive phenotype of the ret1-1 mutant and that the soo1-1/ret1-1 mutation may confer defects in post-translational modification of proteins involved in the yeast cell wall biogenesis. Evidence for a putative role of 5th WD40 domain of the Soo1p/$\alpha$-COP in the construction and maintenance of cell walls was also presented by complementation test with deletion constructs of the SOOl.

출아 효모인 Saccharomyces cerevisiae의 베타-1,3-글루칸 생합성의 결함을 초래하는 돌연변이 유전자(sool-1)를 분리하여 돌연변이 부위의 염기서열을 결정하고 그 특성을 분석하였다. cool-1 유전자의 염기서열 분석 결과, 681번의 염기인 G가 A로 치환되어 Soolp의 $Gly^{227}$이 Asp로 치환되는 결과를 나타내는 것으로 판명되었고, cool-1 유전자는 기존에 보고된 retl-1 유전자와 동일한 돌연변이 유전자로 판명되었다. 그러나, ret1-1이 나타내는 온도감수성 형질은 배지에 1.2 M sorbitol 등의 삼투안정제를 첨가하면 극복될 수 있으며, cool-l/retl-1의 돌연변이 부위가 세포벽합성 관련 단백질의 번역 후 수식과정에 영향을 미친 것임을 확인하였다. 한편, Soolp/$\alpha$-COP의 N-말단에 존재하는 6개의 WD40 domain중 5번째 WD40 domain이 효모의 세포벽 합성이나 구조유지에 중요한 역할을 담당할 것임을 시사하는 결과를 얻었다.

Keywords

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