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Role of the Processing at Amino-Terminus on the Regulation of Half-life of Protein

Research Project

Project/Area Number 63044090
Research Category

Grant-in-Aid for international Scientific Research

Allocation TypeSingle-year Grants
SectionJoint Research
Research InstitutionOsaka University

Principal Investigator

TSUNASAWA Susumu  Institute for Protein Research, Osaka University, Associate Professor, 蛋白質研究所, 助教授 (30029962)

Co-Investigator(Kenkyū-buntansha) BULGAC Ellena  University of Rochester, Assistant Professor, 医学部, 準教授
STERNGLANZ Rolf  New York State University, Professor, 医学部, 教授
MOERSCHELL Richard  University of Rochester, Assistant Professor, 医学部, 準教授
DUMONT Mark  University of Rochester, Associate Professor, 医学部, 助教授
SHERMAN Fred  University of Rochester, Professor, 医学部, 教授
KATO Ikunoshin  Biotechonolgy Research Laboratories, Takara Shuzo Co., Head, バイオ研究所, 所長
YAMADA Michiyuki  Institute for Protein Research, Osaka University, Associate Professor, 蛋白質研究所, 助教授 (10076995)
Project Period (FY) 1988 – 1990
Project Status Completed (Fiscal Year 1990)
Budget Amount *help
¥3,400,000 (Direct Cost: ¥3,400,000)
Fiscal Year 1990: ¥1,300,000 (Direct Cost: ¥1,300,000)
Fiscal Year 1989: ¥1,300,000 (Direct Cost: ¥1,300,000)
Fiscal Year 1988: ¥800,000 (Direct Cost: ¥800,000)
KeywordsProcessing / Acetylation / Methionine aminopeptidase / Post-translational modification / Acetyltransferase / 開始メチオニン
Research Abstract

A large part of cellular proteins are in a dynamic state of turnover. Protein breakdown is responsible for essential cellular functions such as the modulation of the levels of key enzymes and regulatory proteins and removal of abnormal proteins. For the half-lives of individual proteins it has been reported that N-terminal amino acid is an important factor.
To study for the role of N-terminal amino acid on regulation for breakdown of cellular proteins, we have investigated to elucidate the rules of N-terminal processing observed in newly synthesized proteins by using various iso-1-cytochrome c mutants altered at their N-terminal region as a model system, and to isolate the related enzymes.
The results suggest that initiator methionine (Met) is completely removed from penultimate residue having radii of glynation on 1, 29 A or less, and that of those newly, appeared amino acids at least glycine, serine and alanine are acetylated depending on some structural characterization. Furthermore, of the retained N-terminal methionine residues, the proteins having both Met-Asp- and Met-Glu sequences are also acetylated. From these results it has been thus estimated that at least the following three enzymes are conjugated in N-terminal processing of proteins. The first enzyme is a methionine aminopeptidase (MAP), which acts on removal of initiator methionine, and the second and the third are N-acetyltransferases with different specificities as suggested above (NAT1 : for glycine, alanine and serine as the N-terminal amino acid ; nat2 : for methionine followed by acidic residues). The isolation of these three enzymes are now undergoing using saccharomyces cerevisiae as the materials.

Report

(1 results)
  • 1990 Final Research Report Summary
  • Research Products

    (12 results)

All Other

All Publications (12 results)

  • [Publications] K.メチオニン19638-19643

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1990 Final Research Report Summary
  • [Publications] R.P.Moerschell: "Transformation of yeast with symthetic oligenucleotides" Proceeding of National Academy of Sciemce,U.S.A.84. 524-528 (1988)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1990 Final Research Report Summary
  • [Publications] J.R.Mullen: "Identification and characterization of genes and mutants for an Nーterminal acetyltransferase from yeast" EMBO Journal. 8. 2067-2075 (1989)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1990 Final Research Report Summary
  • [Publications] M.Mitta: "Primary structure of porcine liven acylamino acidーreleasing enzyme deduced from cDNA seguene" Journal of Biochemistry. 106. 730-733 (1989)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1990 Final Research Report Summary
  • [Publications] S.Tsunasawa: "Microseguence analysis of Nーacetylated proteins" Journal of Protein Chemistry. 9. 265-266 (1990)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1990 Final Research Report Summary
  • [Publications] R.P.Moerschell: "The specificities of yeast methionine aminopetidase and acelation of aminoーtermimal methionine in vivo" Journal of Biological Chemistry. 265. 19638-19643 (1990)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1990 Final Research Report Summary
  • [Publications] D.R.Hickey: "Symthesis and expression of genes encoding tuna, pigeon, and horse cytochrome c in yeast Sacharomyces cerevisiae" Gene. (1981)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1990 Final Research Report Summary
  • [Publications] R. P. Moerschell: "Transformation of yeaot with synthetic oligonucleotides" Proceeding of National Academy of Science U. S. A.84. 524-528 (1988)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1990 Final Research Report Summary
  • [Publications] J. R. Mullen: "Identification and characterization of genes and mutants for an N-terminal acetyltransferase from yeast" EMBO Journal. 8. 2067-2075 (1989)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1990 Final Research Report Summary
  • [Publications] M. Mitta: "Primary structure of porcine fiver acylamino acid-releasing enzyme deduced from cDNA sequence" Journal of Biochemistry. 106. 730-733 (1989)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1990 Final Research Report Summary
  • [Publications] S. Tsunasawa: "Microsequence analysis of N-acetylated proteins" Journal of Protein Chemistry. 9. 265-266 (1990)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1990 Final Research Report Summary
  • [Publications] R. P. Moerschell: "The specificities of yeast methionine aminopeptidase and acetylation of Journal of Biological Chemistry" Journal of Biological Chemistry. 265. 19638-19643 (1990)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1990 Final Research Report Summary

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Published: 1988-04-01   Modified: 2016-04-21  

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