High-Level Expression of the Methanol-Inducible β-Galactosidase Gene by Perfusion Culture of Recombinant Pichia pastoris Using a Shaken Ceramic Membrane Flask
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概要
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The perfusion culture technique using a shaken ceramic membrane flask(SCM flask)was applied to achieve high-level expression of recombinant gene. A recombinant methylotrophic yeast strain, Pichia pastoris, was cultured aerobically with head space ventilation on a reciprocal shaker using an SCM flask. High-level production of β-galactosidase was attempted by increasing both the cell concentration and the intracellular content of β-galactosidase. The productivity and yield of β-galactosidase were compared between two-stage culture and growth-associated production methods. In the two-stage culture method, the cell concentration was first raised to 57 g/l at 121 h by feeding glycerol and, thereafter, expression of β-galactosidase was induced by feeding methanol. The β-galactosidase activity in the culture broth quickly increased up to 96 kU/ml within 48 h of initiating the production phase, while the cell concentration continued to increase, reaching 106 g/l after 167 h culture. On the other hand, in the growth-associated production method, β-galactosidase was produced from an early stage of the culture by the feeding of methanol. The β-galactosidase activity reached 152 kU/ml at 168 h, while the cell concentration was depressed to 49.7 g/l. The results showed that the growth-associated production method with the feeding of methanol was highly effective for high-level expression of the methanol-inducible recombinant gene of Pichia pastoris. A β-galactosidase productivity level 10 times higher than that obtained in an ordinary fed-batch culture using a shake flask was readily achieved by continuous replenishment of the culture supernatant.
- 社団法人日本生物工学会の論文
- 1998-07-25
著者
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Mochizuki Eiko
Tsukuba Research Laboratories Nippon Glaxo Ltd.
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Suzuki Takahiro
Department Of Chemical Engineering Science Yokohama National University
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OHASHI RYO
Department of Biological Science and Technology, Science University of Tokyo
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KAMOSHITA YUYA
Department of Biological Science and Technology, Science University of Tokyo
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Ohashi R
Sci. Univ. Tokyo Chiba Jpn
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Ohashi Ryo
Department Of Biological Science And Technology Science University Of Tokyo
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Kamoshita Y
Department Of Biological Science And Technology Science University Of Tokyo
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Kamoshita Yuya
Department Of Biological Science And Technology Science University Of Tokyo
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Suzuki T
Laboratory Of Microbial Biochemistry Institute For Chemical Research Kyoto University
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So Tomoko
Second Department Of Surgery Faculty Of Medicine University Of Occupational And Environmental Health
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So Tetsuya
Second Department Of Surgery School Of Medicine University Of Occupational And Environmental Health
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Suzuki Takahiro
Department Of Anesthesiology Surugadai Nihon University Hospital
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