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Catalytic Mechanism of a New Catalytic Antibody L-chain, L-zyme.

Research Project

Project/Area Number 06650916
Research Category

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

Allocation TypeSingle-year Grants
Research Field 生物・生体工学
Research InstitutionOSAKA UNIVERSITY

Principal Investigator

TAKAGI Masahiro  Faculty of Engineering, Osaka University, Associate Professor, 工学部, 助教授 (00183434)

Project Period (FY) 1994 – 1995
Project Status Completed (Fiscal Year 1995)
Budget Amount *help
¥1,900,000 (Direct Cost: ¥1,900,000)
Fiscal Year 1995: ¥600,000 (Direct Cost: ¥600,000)
Fiscal Year 1994: ¥1,300,000 (Direct Cost: ¥1,300,000)
KeywordsCatalytic mechanism / Tertiary structure prediction / Peroxidase / 構造予測 / 解離定数 / パーオキシダーゼ
Research Abstract

Two hybridoma cells (03-1,13-1), that produce monoclonal antibody against TCPP,were obtained. Genes for both H and L chains of monoclonal antibodies were cloned, sequenced and overexpressed using E.coli as a host. It was found that the independent antibody L chains from both Mab03-1 and Mab13-1 have specific interaction with TCPP.
The antibody L chain from Mab13-1 exhibits much higher peroxidase activity than TCPP Fe (III) alone. Furthermore, optimum temperature of the peroxidase reaction by the complex of 13-1L chain and TCPP Fe (III) was 90゚C,while that of the TCPP Fe (III) alone was 60゚C.Characterization of the mutant catalytic antibodies revealed that the hydrophobic region in the constant region (residue number 115-146) is important for high thermostability and the hydrophilic region (residue number 147-189) is important for high activity. Tertiary structure of this L cahin catalytic antibody was predicted using a computer software AbM and the structure was compared with the strucure of the peroxidase from Arthromyces ramosus. Important His and Arg residues for the calytic activity were conserved in the antigen binding site of the L chain (His38, His94 and Arg96) and they were found in complementarity determining regions (CDR).

Report

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

    (9 results)

All Other

All Publications (9 results)

  • [Publications] M.Takagi et al.: "Thermostable peroxidase activity with a recombinaut antibody L chain-porphyrin Fe (III) complex." FEBS Lett.375. 273-276 (1995)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] 高木昌宏 ら: "抗体酵素の新しい視点" 化学と生物. 31. 771-773 (1993)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] 今中忠行、高木昌宏: "抗体工学とその利用" 農芸化学会誌. (1996)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] Tadayuki Imanaka,M.Takagi: "Antibody Expression and Engineering" American Chemical Society, 175 (1995)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] Masahiro Takagi, Katsunori Kohda, Takuya Hamuro, Akira Harada, Hiroyasu Yamaguchi, Mikiharu Kamachi, and Tadayuki Imanaka.: "Thermostable peroxidase activity with a recombinant antibody L chain-porphyrin Fe (III) complex." FEBS Letters. 375. 273-276 (1995)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] Tadayuki Imanaka and Masahiro Takagi: Strong and specific peroxidase activity with an antibody L chain-porphyrin Fe (III) complex.Antibody Expression and Engineering ACS Symposium series 604.American chemical Society, (1995)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] M.Takagi etal.: "Thermostcble peroxidase activity with a recombinaut antibody r-chain-porphyrin Fe (III) complex" FEBS Letters. 375. 273-276 (1995)

    • Related Report
      1995 Annual Research Report
  • [Publications] T.lmanaka and M.Takagi: "Antibody Expression and Engineering" American Chemical Society, 154 (1995)

    • Related Report
      1995 Annual Research Report
  • [Publications] 高木昌宏.今中忠行ら: "抗体酵素の新しい視点" 化学と生物. 31. 771-773 (1993)

    • Related Report
      1994 Annual Research Report

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

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