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1991 Fiscal Year Final Research Report Summary

Cloning and expression of genes responsible for secondary metabolism in medicinal plants.

Research Project

Project/Area Number 02807199
Research Category

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

Allocation TypeSingle-year Grants
Research Field Biological pharmacy
Research InstitutionChiba University

Principal Investigator

SAITO Kazuki  CHiba Univ., Fac. Pharm. Sci. Lecturer, 薬学部, 講師 (00146705)

Co-Investigator(Kenkyū-buntansha) MURAKOSHI Isamu  Chiba Univ., Fac. Phorm. Sci. Professor, 薬学部, 教授 (30009162)
Project Period (FY) 1990 – 1991
KeywordsSecondary metabolism / Molecular cloning / Transgenic Plant / Cysteine synthase
Research Abstract

Cysteine synthase(CSase)(O-acetylserine(thiol)-lyase, EC 4.2.99.8)catalyzes the formation of L-cysteine, the key step in sulfur assimilation in plants, from O-acetyl-L-serine and hydrogen sulfide. We report here isolation and characterization of cDNA clones encoding cysteine synthase from spinach(Spinacia oleracea L.). Internal peptide sequences were obtained from V8 protease-digested fragments of purified CSase. A lambdagt10 cDNA library was constructed from poly(A)^+ RNA of young green leaves of spinach. Screening with two synthetic mixed nucleotides encoding the partial peptide sequences gave 19 positively hybridized clones from 2x10^5 clones. Nucleotide sequence analysis of two independent cDNA clones revealed a continuous open reading frame encoding a polypeptide of 325 amino acids with a calculated molecular mass of 34, 185 Da. Sequence comparison of deduced amino acids showed 53% identity with CSases of Escherichia coli and Salmonella typhimurium. Sequence homology was also observed with other metabolic enzymes of amino acids in bacteria and yeast, and rat hemoprotein H-450. A bacterial expression vector was constructed and this plasmid was able to genetically complement an E. coli auxotroph deficient CSases. The accumulation of functionally active spinach CSase in E. coli was also demonstrated by Western blotting and the assay of enzymatic activity.

  • Research Products

    (8 results)

All Other

All Publications (8 results)

  • [Publications] K.Saito 他: "Integration and expression of a rabbit liver oyto chrome pー450 gene in transgenic Nicotiana tabacum" Proceedings of the National Academy of Sciences USA. 88. 7041-7045 (1991)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] K.Saito 他: "Metabolism of solanaceous alkaloids in transgenic plant teratomas integrated with genetically engineered genes" Tetranedron. 47. 5955-5968 (1991)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] K.Saito 他: "Tissueーspecific and stressーenhancing expression of the TR promoter for mannopine synthase in transgenic plants" Planta. 184. 40-46 (1991)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] K.Saito 他: "Molecular cloning boeterial expression of cDNA encoding a plant cysteine synthase"

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] K. Saito, M. Yamazaki, H. Kaneko, I. Murakoshi, Y. Fukuda & M. Van Montagu: ""Tissue-specific and stress-enhancing expression of the TR promoter for mannopine synthase in transgenic medicinal plants, "" Planta. 184. 4-46 (1991)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] K. Saito, M. Yamazaki, A. Kawaguchi & I. Murakoshi: ""Metabolism of solanaceous alkaloids in transgenic plant teratomas integrated with genetically engineered genes, "" Tetrahedron. 7m. 5955-5968 (1991)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] K. Saito, M. Noji, S. Ohmori, Y. Imai & I.: ""Integration and expression of a rabbit liver cytochrome P-450 gene in transgenic Nicotiana tabacum, "" Proceedings of the National Academy of Sciences USA. 88. 7041-7045 (1991)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] K. Saito, M. Yamazaki & I. Murakoshi: ""Transgenic medicinal plants : Agrobacterium-mediated foreign gene transfer and production of secondary metabolites, "" Journal of Natural Products. 55. 149-162 (1992)

    • 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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