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STUDIES ON THE STRUCTURE AND FUNCTION OF THE GLYCINE CLEAVAGE SYSTEM

Research Project

Project/Area Number 05670127
Research Category

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

Allocation TypeSingle-year Grants
Research Field General medical chemistry
Research InstitutionThe University of Tokushima

Principal Investigator

OKAMURA Kazuo  THE UNIVERSITY OF TOKUSHIMA INSITUTE FOR ENZYME RESEARCH,RESEARCH ACCOCIATE, 酵素科学研究センター, 助手 (10108863)

Project Period (FY) 1993 – 1994
Project Status Completed (Fiscal Year 1994)
Budget Amount *help
¥2,100,000 (Direct Cost: ¥2,100,000)
Fiscal Year 1994: ¥500,000 (Direct Cost: ¥500,000)
Fiscal Year 1993: ¥1,600,000 (Direct Cost: ¥1,600,000)
KeywordsGLYCINE CLEAVAGE SYSTEM / T-PROTEIN / AMINOMETHYLTRANSFERASE / NONKETOTIC HYPERGLYCINEMIA / テトラヒドロ葉酸
Research Abstract

1.The full-length cDNA sequence of human T-protein of the glycine cleavage system was determined from overlapping cDNA clones. The 1209-base pair open reading frame encodes precursor protein of 403 amino acid which consist of 27-residue mitochondrial presequence and 375-residue mature protein. The deduced amino acid sequence of the mature protein shows 90,68 and 28% homology to that of bovine, chicken and Escherichia coli T-protein, respectively. The conserved regions among four species are limited.
2.The gene for human T-protein was isolated from a human placental cosmid library. The gene is about 6 kb in length with nine exons and is assigned to subband 3p21.2-p21.1 by fluorescence in situ hybridization.
3.Two pedigrees of nonketotic hyperglycinemia caused by T-prorein deficiency have been investgated at molecular level.Three different point mutations which lead to amino acid substitutions Gly19Arg, Gly241Asp and Arg292His were identified. Gly241 is conserved in T-protein of various sp … More ecies, even in E.coli, whereas Gly19 and Arg292 are replaced by Ala and Leu, respectively, in E.coli. Therefore, these substitutions may cause the change in tertiary structure of T-protein.
The E.coli T-protein lacking the N-terminal 16 amino acids showed no T-protein ativity, when the truncated T-proein gene was expressed in E.coli. In order to investigate the role of N-terminal region, E.coli T-protein with variously truncated N-terminal portions were overexpressed. The specific activity of T-protein lacking 4 residues are 20% of that of the full length T-protein (ET). The specific activity was about 5% of that of ET when 7 residues or more were deleted. T-protein lacking 7 amino acid residues (ETDELTA7) was purified and its characteristics such as CD spectra and kinetics were compared with ET.ETDELTA7 was eluted at a little higher salt concentration than ET from DEAE-Sepharose column. There is no significant difference in the CD spectra of both proteins. However, the affinity of ETDELTA7 for E.coli H-protein remarkably decreased. These results suggest that the N-terminal amino acid sequence of T-protein seemes to be important for the interaction with H-protein. Less

Report

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

    (18 results)

All Other

All Publications (18 results)

  • [Publications] Hayasaka,K.: "Isolation and sequence determination of cDNA encoding human T-protein of the glycine cleavage system." Biochem.Biophys.Res.Commun.192. 766-771 (1993)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1994 Final Research Report Summary
  • [Publications] Okamura-Ikeda,K.: "Cloning and nucleotide sequence of the gcv operon encoding the Escherichia coli glycine-cleavage system." Eur.J.Biochem.216. 539-548 (1993)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1994 Final Research Report Summary
  • [Publications] 池田和子: "大腸菌グリシン開裂酵素オペロンの解析" 生化学. 65. 768- (1993)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1994 Final Research Report Summary
  • [Publications] Nanao,K.: "Structure and chromosomal localization of the aminomethyl-transferase gene(AMT)" Genomics. 19. 27-30 (1994)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1994 Final Research Report Summary
  • [Publications] Nanao,K.: "Identification of the mutations in the T-protein gene causing typical and atypical nonketotic hyperglycinemia" Hum.Genet.93. 655-658 (1994)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1994 Final Research Report Summary
  • [Publications] 池田和子: "グリシン開裂酵素系T蛋白質活性におけるN末端の役割" 生化学. 66. 950- (1994)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1994 Final Research Report Summary
  • [Publications] Hayasaka, K: "Isolation and sequence determination of cDNA encoding human T-protein of the glycine cleavage system" Biochem.Biophys.Res.Commum.192. 766-771 (1993)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1994 Final Research Report Summary
  • [Publications] Okamura-Ikeda, K.: "Cloning and nucleotide sequence of the gcv operon encoding the Escherichia coli glycine-cleavage system" Eur.J.Biochem.216. 539-548 (1993)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1994 Final Research Report Summary
  • [Publications] Nanao, K.: "Structure and chromosomal localization of the aminomethyltransferase gene (AMT)" Genomics. 19. 27-30 (1994)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1994 Final Research Report Summary
  • [Publications] Nanao, K.: "Identification of the mutations in the T-protein gene causing typecal and atypical nonketotic hyperglycinemia" Hum.Genet.93. 655-658 (1994)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1994 Final Research Report Summary
  • [Publications] Nanao,K: "Structure and chromosonaml localization of the aminomethyltransferase gene(AMT)" Genomics. 19. 27-30 (1994)

    • Related Report
      1994 Annual Research Report
  • [Publications] Nanao,K: "Identification of the mutations in the T-protein gene causing typical and atypical nonketotic hyperglycinemia" Hum.Genet.93. 655-658 (1994)

    • Related Report
      1994 Annual Research Report
  • [Publications] 池田和子: "グリシン開裂酵素系T蛋白質活性におけるN末端の役割" 生化学. 66. 950 (1994)

    • Related Report
      1994 Annual Research Report
  • [Publications] Hayasaka,K.: "Isolation and sequence determination of cDNA encoding human T-protein of the glycine cleavage system" Biochem.Biophys.Res.Commun.192. 766-771 (1993)

    • Related Report
      1993 Annual Research Report
  • [Publications] 池田和子: "大腸菌のグリシン開裂酵素系オペロンの解析" 生化学. 65. 768 (1993)

    • Related Report
      1993 Annual Research Report
  • [Publications] Okamura-Ikeda,K.: "Cloning and nucleotide sequence of the gcv operon encoding the Escherichia coli glycine-cleavage system" Eur.J.Biochem.216. 539-548 (1993)

    • Related Report
      1993 Annual Research Report
  • [Publications] Nakao,K.: "Structure and chromosomal localization of the aminomethyltransferase gene(AMP)" Genomics. 19. 27-30 (1994)

    • Related Report
      1993 Annual Research Report
  • [Publications] Nakao,K.: "Identification of the mutations in the T-protein gene causing typical or atypical nonketotic hyperglycinemia" Hum.Genet.(in press).

    • Related Report
      1993 Annual Research Report

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

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