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Application of Molecular Chaperone to Protein Engineering

Research Project

Project/Area Number 06558097
Research Category

Grant-in-Aid for Developmental Scientific Research (B)

Allocation TypeSingle-year Grants
Research Field Functional biochemistry
Research InstitutionKYOTO UNIVERSITY

Principal Investigator

ESAKI Nobuyoshi  Institute for Chemical Research, Kyoto University, Associate Professor, 化学研究所, 助教授 (50135597)

Co-Investigator(Kenkyū-buntansha) OKA Masanori  Institute of Bioscience Research, Toyobo Co.Senior Researcher, 敦賀バイオ研究所, 主席部員
KURIHARA Tatsuo  Institute for Chemical Research, Kyoto University Instructor, 化学研究所, 助手 (70243087)
YOSHIMURA Tohru  Institute for Chemical Research, Kyoto University Instructor, 化学研究所, 助手 (70182821)
SODA Kenji  Institute for Chemical Research, Kyoto University Professor, 化学研究所, 教授 (30027023)
Project Period (FY) 1994 – 1995
Project Status Completed (Fiscal Year 1995)
Budget Amount *help
¥5,900,000 (Direct Cost: ¥5,900,000)
Fiscal Year 1995: ¥1,900,000 (Direct Cost: ¥1,900,000)
Fiscal Year 1994: ¥4,000,000 (Direct Cost: ¥4,000,000)
Keywordsinclusion body / glutamate racemase / alanine racemase / molecular chaperone / GroESL / protein engineering
Research Abstract

Overproduced recombinant proteins are often obtained in the form of inclusion bodies in the host cell, and it is sometimes difficult to solubilize the inclusion bodies into active forms in vitro. Recently, It has been reported that coexpression of the genes of molecular chaperones, dnaK and groESL,caused an increase in solubility of human procollagenase produced in E.coli. The aim of this study is to establish the method to prevent the recombinant protein from the inclusion body formation by the co-production of molecular chaperones. The overexpression of the murI (glr) gene, which encodes the glutamate racemase of Escherichia coli, resulted in the formation of inclusion bodies of the enzyme, and little activity was found in the soluble fraction of the transformant cells. The coexpression of the groESL gene with murI caused an in vivo solubilization of glutamate racemase in an active form. The solivility of glutamate racemase depends on the time and amount of the expression of GroESL g … More ene. In this study, we also examined the effect of GroESL on the folding of the domain peptide of bacterial alanine racemase. A subunit of thermostable alanine racemase of Bacillus stearothermophilus, a homodimer protein, is composed of two domains. When the genes encoding the N- and C-terminal peptide fragments corresponding to the domains were either in tandem or separately expressed in the same host cells, the active fragmentary enzyme was produced. However, when either the N or C-terminal fragment gene was alone expressed, the N-terminal fragment containing lysine 39 bound with the cofactor pyridoxal 5'-phosphate was mostly produced only in an insoluble form, and little C-terminal one was found. The soluble N-terminal fragment was produced on co-production with a molecular chaperone, GroESL,and showed alanine racemase activity. The denatured N-terminal fragment restored the activity on refolding with GroESL.Thus, only the N-terminal domain is involved in catalysis, and the C-terminal one functions as a kind of intramolecular chaperone to help the N-terminal one to fold correctly and can be functionally replaced by GroESL. Less

Report

(3 results)
  • 1995 Annual Research Report   Final Research Report Summary
  • 1994 Annual Research Report
  • Research Products

    (7 results)

All Other

All Publications (7 results)

  • [Publications] M. Ashiuchi et al.: "In Vivo Effect of GroESL on the Folding of Glutamate Racemase of Escherichia coli" J. Biochem.117. 495-498 (1995)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] 吉村 徹: "細菌のD-アミノ酸代謝関連酵素の構造と機能の特性" 日本農芸化学会誌. 69. 501-503 (1995)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] M.Ashiuchi et al.: "In Vivo Effect of GroESL on the Folding of Glutamate Racemase of Escherichia coli" J.Biochem.117. 495-498 (1995)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] T.Yoshimura: "Characteristics of Structure and Function of Bacterial D-Amino Acid Metabolism-Related Enzyme" Nippon Nogeikagaku Kaishi. 69. 501-503 (1995)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] Ashiuchi, M et al. ,: "In Vivo Effect of GroESL on the Folding of Glutamate Racemase of Eschirichia coli" J. Biochem.117. 495-498 (1995)

    • Related Report
      1995 Annual Research Report
  • [Publications] 吉村 徹: "細菌のD-アミノ酸代謝関連酵素の構造と機能の特性" 日本農芸化学会誌. 69. 501-503 (1995)

    • Related Report
      1995 Annual Research Report
  • [Publications] Makoto Ashiuchi: "In vivo Effect of GroESL on the Folding of Glutamate Racemase of Escherichia coli" Journal of Biochemistry. (in press).

    • Related Report
      1994 Annual Research Report

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Published: 1994-04-01   Modified: 2016-04-21  

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