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Design and Synthesis of Novel Artificial Enzymes by Using Recombinant DNA Technique

Research Project

Project/Area Number 07405060
Research Category

Grant-in-Aid for Scientific Research (A)

Allocation TypeSingle-year Grants
Section一般
Research Field 高分子合成
Research InstitutionKYOTO UNIVERSITY

Principal Investigator

KIMURA Shunsaku (1996-1997)  Kyoto University, Graduate School of Engineering, Associate Professor, 工学研究科, 助教授 (80150324)

今西 幸男 (1995)  京都大学, 工学研究科, 教授 (00025991)

Co-Investigator(Kenkyū-buntansha) IMANISHI Yukio  Nara Institute of Science and Technology, Department of Material Science, Profes, 物質創成科学研究科, 教授 (00025991)
伊藤 嘉浩  京都大学, 工学研究科, 助教授 (40192497)
木村 俊作  京都大学, 工学研究科, 助教授 (80150324)
Project Period (FY) 1995 – 1997
Project Status Completed (Fiscal Year 1997)
Budget Amount *help
¥7,200,000 (Direct Cost: ¥7,200,000)
Fiscal Year 1997: ¥3,400,000 (Direct Cost: ¥3,400,000)
Fiscal Year 1996: ¥3,800,000 (Direct Cost: ¥3,800,000)
KeywordsMutants / Recombinant DNA Technique / Artifical Enzymes / Esterase / Subtilisin / Enzymatic Activity / Protein Structure / タンパク質工学 / 遺伝子工学 / リゾチーム / tRNA / ポリプロリン / 非天然アミノ酸
Research Abstract

Hydrophobilized mutant enzymes of esterase from Pseudomonas sp.KWI-56 by connection of 10 or 20 tyrosine residues at the C terminus were synthesized by using the recombinant DNA technique. The mutant protein with a longer poly (tyrosine) chain became more hydrophobic than that with a shorter chain. The structure of the mutant proteins was analyzed by CD spectroscopy, which revealed the decrease of alpha-helicalconformation and the increase of beta-sheet conformation. The enzymatic activity of the mutant esterase was abolished due to the structure change induced by connection of a poly (tyrosine) chain, which should interact with hydrophobic region of the protein. On the other hand, a hydrophobilized mutant enzyme of subtilisin Carsberg by connection of poly (oxyethylene) was synthesized and the structure-activity relationship was investigated in organic solvents. The mutant enzyme showed 150-fold higher activity than the wild type in the ester-exchange reaction in benzen solution. The high activity of the mutant enzyme was also observed in dichloromethane solution, but the activity was diminished in water-miscible organic solvents such as dimethylsulfoxide, acetonitrile, and tetrahydrofuran. In these solvents, the molecular structure of the mutant protein was change significantly probably due to depletion of the essential water from the enzyme.

Report

(4 results)
  • 1997 Annual Research Report   Final Research Report Summary
  • 1996 Annual Research Report
  • 1995 Annual Research Report
  • Research Products

    (21 results)

All Other

All Publications (21 results)

  • [Publications] Y.Ito: "Hydrophobilization of Lysozyme by Genetic Combination with Polyproline at the Carboxyl Terminal" Chem.Lett.65-66 (1997)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1997 Final Research Report Summary
  • [Publications] Y.Ito: "Nonradioisotope Assay to Examine Adaptability of Nonnatural Amino Acids to the Active Center of Ribosomal A Site" J.Bioactive And Compatible Polymers. 12. 59-64 (1997)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1997 Final Research Report Summary
  • [Publications] Y.Ito: "Bactericidal activity of human lysozymes carrying various lengths of polyproline chain at the C-termines" FEBS Lett.415. 285-288 (1997)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1997 Final Research Report Summary
  • [Publications] Y.Imanishi: "Glncose-sensitive insuline-relcasing molecular systems" Pure & Appl.Chem.67. 2015-2021 (1995)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1997 Final Research Report Summary
  • [Publications] H.Ueda: "Incorporation of hydrophobic helix bundle peptides into lipid bilayer membranes facilitated by a peptide-umbrella structure" J.Chem.Soc.Chem.Commun.363-364 (1998)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1997 Final Research Report Summary
  • [Publications] Y.Ito: "Hydrophobilization of lysozyme by genetic combination with polyproline at the carboxyl terminal" Chem.Lett.65-66 (1997)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1997 Final Research Report Summary
  • [Publications] Y.Ito: "Nonradioisotope assay to examine adaptability of Nonnatural amino acids to the active center of ribosomal A site" J.Bioactive and Compatible Polymers. 12. 59-64 (1997)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1997 Final Research Report Summary
  • [Publications] Y.Ito: "Bactericidal activity of human lysozymes carrying Various lenghts of polyproline chain at the C-terminus" FEBS Lett.415. 285-288 (1997)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1997 Final Research Report Summary
  • [Publications] Y.Imanishi: "Glucose-sensitive insuline-releasing molecular systems" Pure & Appl.Chem.67. 2015-2021 (1995)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1997 Final Research Report Summary
  • [Publications] H.Ueda: "Incorporation of hydrophobic helix bundle Peptides into lipid bilayr membranes facilitated by a peptide-umbrella structure" J.Chem.Soc.Chemm.Commun.363-364 (1998)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1997 Final Research Report Summary
  • [Publications] Y.Ito: "Hydropuobilization of Lysozyme by Genetic Combination with polypruline at the Carboxyl Terminal" Chem.Lett.65-66 (1997)

    • Related Report
      1997 Annual Research Report
  • [Publications] Y.Ito: "Nonradioisotope Assay to Examine Adaptability of Nonnatural Amino Acids to the Active Centes of Ribosomal A Site" J.Bioactive and Compatible Polymers. 12. 59-64 (1997)

    • Related Report
      1997 Annual Research Report
  • [Publications] Y.Ito: "Bactericidal actiarity of human lysozymes carrying Various lengths of polyproline chain at the C-terminus" FEBS Lett.415. 285-288 (1997)

    • Related Report
      1997 Annual Research Report
  • [Publications] Y.Imanishi: "Glucose-sensitive insuline-releasing molecular systems" Pure & Appl.Chem.67. 2015-2021 (1995)

    • Related Report
      1997 Annual Research Report
  • [Publications] H.Ueda: "Incorporation of hydropuabic helix bundle peptides in to lipid bilayer membranes facilitated by a peptide-umbrella stnictua" J.Chem.Soc.Chem.Commun.363-364 (1998)

    • Related Report
      1997 Annual Research Report
  • [Publications] Yoshihiro Ito: "Hydrophobilization of lysozyme by genetic combination with polyproline at the corboxyl terminal" Chemistry Letters. 1. 65-66 (1997)

    • Related Report
      1996 Annual Research Report
  • [Publications] Yoshihiro Ito: "Nen-radioisotope assay to examine adaptability of nonnatural amino acids to the active center at ribosomal A site" Journal of Bioaotine and Compatible Polymers. 12(印刷中). (1997)

    • Related Report
      1996 Annual Research Report
  • [Publications] Yoshihiro Ito: "Polymeric Materials Encyclo pedia" CRC Press, 5000 (1996)

    • Related Report
      1996 Annual Research Report
  • [Publications] 今西幸男: "グリコース濃度に応じてインシュリンを放出するタンパク質デバイスの設計と合成" 日本化学繊維研究所講演集. 52. 25-33 (1995)

    • Related Report
      1995 Annual Research Report
  • [Publications] 今西幸男: "Glucose-sensitive insulin-releasing moleinlar systems" Pure Appl. Chem.67. 2015-2021 (1995)

    • Related Report
      1995 Annual Research Report
  • [Publications] 今西幸男: "Polymeric Materials Encyclopedia" CRC Press (Boca Raton, USA), 9600 (1996)

    • Related Report
      1995 Annual Research Report

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Published: 1996-04-01   Modified: 2016-04-21  

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