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The Korean Society for Biotechnology and Bioengineering (한국생물공학회)
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Effect of Glycine Supplement on Extracellular Secretion of Levansucrase form Pseudomonas aurantiaca S-4380 in Recombinant Escherichia coli

Glycine 첨가에 의한 Pseudomonas aurantiaca S-4380 유래 재조합 levansucrase 효소의 세포 외 분비촉진 효과

  • Published : 2003.08.01
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Abstract

The addition of glycine up to 0.5％ (w/v) to Luria broth (LB) media on the secretion of levansucrase in a recombinant strain Escherichia coli JM109/pUPLK1 was observed to enhance the release of periplasmic proteins from the cell to the broth, without significantly affecting the cell growth rate and protein productivity. However, the glycine concentration at 1 ％ (w/v), the cell density attainable at the stationary phase fell to about 50％ and the extracellular activity of levansucrase corresponded to about 80％ of the total (extracellular plus intracellular) activity and increased by 2.6-fold, comparing to the cells grown in the absence of glycine. The increased pH at stationary phase accelerated the degradation of levansucrase. Maximal extracellular activity was attained when 1 ％ glycine was supplemented at the onset of strain growth.

Glycine의 배양액 첨가에 의해 Pseudomonas aurantiaca S-4380 유래 재조합 levansucrase의 세포 외 분비가 촉진된다는 것을 알 수 있었다. 배지액에 존재하는 glycine 농도에 비례 의존적으로 균체 내에서 발현된 효소의 분비량이 증가되었고, 세포의 성장은 억제됨을 알 수 있었다. SDS-PAGE 분석결과 0.5％, 1.0％ glycine 첨가로 배양시간이 증가하면서 세포내의 단백질 배양액으로 분비됨을 알 수 있었다. Levansucrase를 분비시키기 위한 최적화된 조건은 pH을 6.9-7.0으로 조절하면서 1.0％ glycine을 배양초기 첨가하였을 때 배양말기에 단백질의 급격한 분해 없이 145 U/mL의 효소 활성도를 나타내었다.

Keywords

References

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