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Reaction Mechanisms and Mode of Action of a Catalytic Antibody and Pseudomonas Lipase

Research Project

Project/Area Number 05453167
Research Category

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

Allocation TypeSingle-year Grants
Research Field Bioproduction chemistry/Bioorganic chemistry
Research InstitutionKYOTO UNIVERSITY

Principal Investigator

ODA Junichi  Inst.for Chem.Research, Kyoto Univ., Professor, 化学研究所, 教授 (50027041)

Co-Investigator(Kenkyū-buntansha) KATO Hiroaki  Inst.for Chem.Research, Kyoto Univ., Instructor, 化学研究所, 助手 (90204487)
HIRATAKE Jun  Inst.for Chem.Research, Kyoto Univ., Instructor, 化学研究所, 助手 (80199075)
Project Period (FY) 1993 – 1994
Project Status Completed (Fiscal Year 1994)
Budget Amount *help
¥6,700,000 (Direct Cost: ¥6,700,000)
Fiscal Year 1994: ¥1,900,000 (Direct Cost: ¥1,900,000)
Fiscal Year 1993: ¥4,800,000 (Direct Cost: ¥4,800,000)
KeywordsCatalytic antibody / Pseudomonas lipase / Ester hydrolysis / Gene cloning / Chaperon-like protein / Molecular modeling / 活性アルギニン残基 / 可変領域 / 生成物阻害 / 触媒性残基 / 巻き戻しタンパク質 / リパーゼ活性化
Research Abstract

The purpose of this study is to delineate the reaction mechanisms and mode of action of two catalytically-related proteins-a Pseudomonas lipase and an esterolytic antibody, and their applications to preparative molecular transformations.
Monoclonal antibodies were generated against a phosphonate transitionstate analogue for ester hydrolysis.One of the antibodies was found to catalyze the hydrolysis of a racemic ester with high stereoselsecitivy. The reaction, however, was almost stoichiometric due to strong product inhibition. A series of chemical modification of this antibody revealed that one Arg residue in the antibody combining site was essential to the activity.In fact, one Arg was found in the antibody combining site (CDR3) by cloning the gene encoding the variable domain. The same Arg was also found to play a dominant role in product inhibition by charge interaction with a negatively charged product, because the antibody experienced much less product inhibition with a carbonate ester, which undergoes decarboxylation upon hydrolysis to yield a neutral alcohol as the final product. The antibody exhibited at least 100 turnovers without any loss of activity with this substrate.
A gene encoding a lipase was cloned from a Pseudomonas sp.and was overproduced in E.coli. The lipase, however, was produced as a non-active form of inclusion bodies. We found another gene (lip B) located right after the lipase gene, and cloned and overproduced the gene in E.coli.The hitherto unknown protein produced was found to have a chaperon-like activity, assiting the refolding of a denatured lipase in vitro to restore the lipase activity. The action of Lip B was unique to the parent lipase, suggesting a private chaperonin to the Pseudomonas lipase.

Report

(3 results)
  • 1994 Annual Research Report   Final Research Report Summary
  • 1993 Annual Research Report
  • Research Products

    (11 results)

All Other

All Publications (11 results)

  • [Publications] T.Nakatani et al.: "A Mode of Product Inhibition of an Estorolytic Antibody" Tetrahedron Letters. 34. 4945-4948 (1993)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1994 Final Research Report Summary
  • [Publications] M.Inagaki et al.: "One-Pot Conversion of Aldehydes to(S)-2-Acetoxy Nitriles via Reversible Cyanohydrin Formation" Preparative Biotransfomations,2nd Supplement. 1:10. 30-39 (1993)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1994 Final Research Report Summary
  • [Publications] N.Oshima-Hirayama et al.: "Lipase from Pseudomonas aeraginosa,Production in Escherichia coli and Activation in vitro with a Protein from the Downstream Gene" Europaen Joumal of Biochemistry. 215. 239-246 (1993)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1994 Final Research Report Summary
  • [Publications] T.Nakatani et al.: "Chatacterization of a Catalytic Antibody for Stereoselective Ester Hydrolysis-A Catalytic Residue and Mode of Product Inhibition" Bioorganic & Medicinal Chemistry. 2. 457-468 (1994)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1994 Final Research Report Summary
  • [Publications] 平竹潤・小田順一: "最新の不斉合成 2.抗体触媒" 化学と生物. 31. 613-620 (1993)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1994 Final Research Report Summary
  • [Publications] 平竹潤: "抗体触媒の有機合成化学への応用" 現代化学. 11. 36-42 (1993)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1994 Final Research Report Summary
  • [Publications] T.Nakatani, J.Hiratake, A.Shinzaki, R.Umeshita, T.Suzuki, T.Nishioka, H.Nakajima, and J.Oda: ""A Mode of Product Inhibition of an Esterolytic Antibody"" Tetrahedron Letters. 34. 4945-4948 (1993)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1994 Final Research Report Summary
  • [Publications] M.Inagaki, J.Hiratake, T.Nishioka, J.Oda: ""One-pot Conversion of Aldehydes to (S)-2-acetoxy cyanohydrin formation"" Preparative Biotransformations, 2nd supplement. 1 : 10.30-1 : 10.39 (1993)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1994 Final Research Report Summary
  • [Publications] N.Oshima-Hirayama, K.Yoshikawa, T.Nishioka, J.Oda: ""Lipase from Pseudomonas aeruginosa, Production in Escherichia coli and Activation in vitro with a Protein from the Downstream Gene"" European Journal of Biochemistry. 215. 239-246 (1993)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1994 Final Research Report Summary
  • [Publications] T.Nakatani, R.Umeshita, J.Hiratake, A.Shinzaki, T.Suzuki, H.Nakajima, J.Oda: ""Characterization of a Catalytic Antibody for Stereoselective Ester Hydrolysis-A Catalytic Residue and Mode of Product Inhibition"" Bioorganic & Medicinal Chemistry. 2. 457-468 (1994)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1994 Final Research Report Summary
  • [Publications] Takuji Nakatani: "Characterization of a Catalytic Antibody for Stereoselective Ester Hydrolysis-A Catalytic Residue and Mode of Product Inhibition" Bioorganic d Medicinal Chemistry. 2. 457-468 (1994)

    • Related Report
      1994 Annual Research Report

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Published: 1993-04-01   Modified: 2016-04-21  

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