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1991 Fiscal Year Final Research Report Summary

Constraction of vector-host system of autotrophic bacteria (Thiobacillus)

Research Project

Project/Area Number 02660121
Research Category

Grant-in-Aid for General Scientific Research (C)

Allocation TypeSingle-year Grants
Research Field 応用微生物学・発酵学
Research InstitutionOkayama University

Principal Investigator

TANO Tatsuo  Okayama Univ., Faculty of Agric., Prof., 農学部, 教授 (60032976)

Co-Investigator(Kenkyū-buntansha) INAGAKI Kenji  Okayama Univ., Faculty of Agric., Asso. Prof., 農学部, 助教授 (80184711)
Project Period (FY) 1990 – 1991
KeywordsAutotrophic bacteria / Thiobacillus / Vector-Host system / Promoter / T. ferrooxidans / 3-Isopropylmalate dehydrogenase / Ampicillin resistance / Electroporation
Research Abstract

1. Constraction of a vector : 1)Promoter ; we have searched for promoter-bearing fragments harbored in the chromosomal DNA of Thiobacillus ferrooxidans AP19-3 using a promoter assay vector for Escherichia coli(PMC1403)and have gotten 27 strains having promoter activity. The comparision of the insertion fragments sequences(pTFP12, 15, 19, 26, 28)and the promoter sequence of E. coli(TTGACA -17 bp-TATAAT)revealed high homology among them. As the results of these experiments we concluded that RNA polymerase of E. coli is able to recognize these promoter sequences, resulting in binding to them. 2)Marker gene ; To constract a shuttle vector between E. coli and T. ferrooxidans, a marker plasmid which are able to express in both organisms must be prepared. 3-Isopropylmalate dehydrogenase gene(leuB)which are used in E-coli and Saccharomyces cerevisiae as a marker gene was cloned in E. coli and its sequence was determined. The DNA sequence had high homology with those of E. coli, S. cerevisiae, … More thermophilic bacteria and alkalophilic bacteria. Hereafter, if an ampicillin registance determinant could be inserted into leuB using transposon, this gene can be useful as a marker gene.
2. Preparation of the ampicillin sensitive mutant : We tried to prepare the mutant of T. ferrooxidans AP19-3 sensitive to ampicillin to use it as a host for transformation. 4 mutants sensitive to 25 mug ampicillin/ml were obtained.
3. Examination of the transformation method : Transformations of the prepared plasmid vector into the cells of Thiobacillus by means of the calcium chloride method or the alkaline metal method were very difficult because of their strong cell membrane. We tested the electroporation technique to transfer DNA directly into the cells. Higher levels of membrane permeabilization increased the amount of gene transfer but decreased cell viability. When the cells were treated under 3 puls condtions, cell viabilities were 30-70%. At present, some conditions of the buffer solution for this method have been testing. Less

  • Research Products

    (4 results)

All Other

All Publications (4 results)

  • [Publications] Inakaki Kenji: "Cloning and Expression of the Thiobacillus ferrooxidans 3-Isopropylmalate Dehydrogenase Gne in Escherichia coli" Jounal of Fermentation and Bioengineering. 70. 71-74 (1990)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 稲垣 賢二: "好酸性細菌の利用と育種" 岡山大学RI共同利用津島施設報. 1. 34-36 (1991)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Kenji Inagaki, Hiroshi Kawaguchi, Yasuyuki Kuwata, Tsuyoshi Sugio, Hidehiko Tanaka and Tatsuo Tano: "Cloning and Expression of the Thiobacillus ferrooxidans 3-Isopropylmalate Dehydrogenase Gene in Escherichia coli" J. Ferment. Bioeng.70. 71-74 (1990)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Kenji Inagaki: "Utilization and Molecular Breeding of Acidophilic Bacteria" Ann. Rep. RI-Labo. Okayama Univ.1. 34-36 (1991)

    • Description
      「研究成果報告書概要(欧文)」より

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Published: 1993-03-16  

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