Saccharomyces cerevisiae에서 Zymomonas mobilis 유래 Levansucrase의 발현과 분비 = Expression and Secretion of Zymomonas mobilis Levansucrase in Saccharomyces cerevisiae.

국문 초록 (Abstract)

Zymomonas mobilis 유래 levansucrase 유전자(levU)를 GAL1 promoter 하류에 연결시킨 pYES-levU와 GAL10 promoter 하류에 Kluyveromyces marxianus exoinulinase의 분비 신호서열(INU1 ss) 하류에 연결시킨 pYInu-levU를 각각 구축하였다. 이들 plasmid를 invertase 결손 변이주(suc2-$\Delta$9)인 S. cerevisiae SEY2102에 형질전환시켜 고활성 형질전환주를 선발하였다. 효모 형질전환주를 galactose 함유 배지로 배양한 결과, pYES-levU 함유 형질전환주인 경우 levansucrase의 총활성은 7.17U/ml이고, pYInu-levU 함유 형질전환주인 경우 6.61U/ml에 도달하였다. 발현된 levansucrase 약 50% 정도가 배지와 periplasmic space에 존재하였고, INU1 ss에 의한 분비효율 증가는 관찰할 수 없었다. 또한, 효모에서 발현된 재조합 levansucrase는 과당쇄화된 형으로 생산되는 것으로 보여진다.

다국어 초록 (Multilingual Abstract)

Levansucrase gene (levU) from Zymomonas mobilis was subcloned downstream of GALl promoter in pYES 2.0 and pYInu-AT [GALl0 promoter＋exoinulinase signal sequence of Kluyveromyces marxianus], resulting pYES-levU and pYInu-levU, respectively. The two expression plasmids were introduced into an invertase-deficient strain, Saccharomyces cerevisiae SEY2102, and then transformants showing high activity of levansucrase were selected. When each yeast transformants was cultivated in medium containing galactose, the extracellular and intracellular activities of levansucrase reached about 7.17 U/㎖ with the strain harboring pYES-levU and 6.61 U/㎖ with the strain harboring pYInu-levU. It was found that about 50% of levansucrase were detected in the medium and periplasmic space, and exoinulinase signal sequence didn't enhance the secretion efficiency. Furthermore, the recombinant levansucrase expressed in yeast seems to be produced as a hyper-glycosylated form.

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