| Project/Area Number |
03650772
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| Research Category |
Grant-in-Aid for General Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Research Field |
化学工学
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| Research Institution | Osaka University |
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Principal Investigator |
SHIOYA Suteaki Osaka Univ., Fac. of Eng., Assoc. Prof., 工学部, 助教授 (50026259)
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| Co-Investigator(Kenkyū-buntansha) |
OMASA Takeshi Osaka Univ., Fac. of Eng., Research Assoc., 工学部, 助手
SHIMIZU Hiroshi Osaka Univ., Fac. of Eng., Research Assoc., 工学部, 助手 (00226250)
SUGA Ken-ichi Osaka Univ., Fac. of Eng., Prof., 工学部, 教授 (20029250)
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| Project Period (FY) |
1991 – 1992
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| Project Status |
Completed (Fiscal Year 1992)
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| Budget Amount *help |
¥1,400,000 (Direct Cost: ¥1,400,000)
Fiscal Year 1992: ¥400,000 (Direct Cost: ¥400,000)
Fiscal Year 1991: ¥1,000,000 (Direct Cost: ¥1,000,000)
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| Keywords | Recombinant yeast / Temperature-sensitive / Rice-alpha-amylase / Acidic phosphatase / Specific growth rate / Two-stage production / ∂ーアミラ-ゼ / 酸性ホスファタ-ゼ |
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| Research Abstract |
The goal of this study are to construct an efficient temperature-sensitive gene expression system in Saccharomyces cerevisiae and to get an optimum solution for maximum production of a useful bio-product using this host-vector system. We got the following results.
(1) Utilizing MF_<alpha>1::PHO5 vector, we constructed a temperature-sensitive gene expresssion system and used for acidec phosphatase(APase) production. Optimal strategy was a two-level control of the cultivation temperature which could be interpreted as a two-stage production. This was confirmed experimentally.
(2) This gene-expression system was applied to production of a foreign protein, rice alpha-amylase and got a fairly good result.
(3) PHO84 promotor was introduced to a host(SH3337-strain) which is PHO81 temperature-sensitive mutant. Using this gene expression system, rice-alpha-amylase was produced more than the former system.
(4) For this gene expression system, an optimal strategy of cultivation temperature was also obtained using the relationship between the specific growth rate, specific production rate and cultivation temperature. Optimal strategy was a bang-bang control of temperature such as switching from 30 C to 25 C and it could be also iterpreted as a two-stage production having growth stage and production stage.
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