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Mechanisms of translational enhancer elements in plant mRNA.

Research Project

Project/Area Number 09480182
Research Category

Grant-in-Aid for Scientific Research (B)

Allocation TypeSingle-year Grants
Section一般
Research Field Molecular biology
Research InstitutionNagoya University (1999)
Hokkaido University (1997-1998)

Principal Investigator

OBOKATA Junichi  Nagoya University, Center for Gene Research, Associate Professor, 遺伝子実験施設, 助教授 (50185667)

Project Period (FY) 1997 – 1999
Project Status Completed (Fiscal Year 1999)
Budget Amount *help
¥2,300,000 (Direct Cost: ¥2,300,000)
Fiscal Year 1999: ¥1,300,000 (Direct Cost: ¥1,300,000)
Fiscal Year 1998: ¥1,000,000 (Direct Cost: ¥1,000,000)
KeywordsPlant mRNA / Translational enhancer / Protein synthesis / cap-independent translation / in vitro evolution / キャップ・非依存的翻訳 / 高等植物 / mRNA / 5'非翻訳領域 / psaDb / 翻訳効率 / 5′非翻訳領域 / タバコ / psa Db / ポリ(U)
Research Abstract

Translational enhancers are mRNA motifs that enhance translational efficiency of encoded proteins. In advance of this research project, we had found two translational enhancer elements in plants. The initial plan of this project was to elucidate the enhancing mechanism of these motifs by use of standard recombinant DNA technology. However, halfway the research period, we found that the enhancer effects of these motifs are greatly altered by nucleotide sequences in the UTRs well as the coding region. This suggests that the enhancing effects of these motifs are not autonomous, but based on or sensitive to the complexed intra-molecular interactions of base pairing. There has been no experimental approach that applicable to such a complexed and delicate translational regulation. Conventional base substitution, insertion, and/or deletion technique may cause unexpected conformational change of mRNA molecules, resulting in unforseen base-interactions. From these, we altered the course of this project in 1999 to establish the experimental system applicable to such a complexed translational enhancement. After two years of trial and error, we succeeded in establishing the epoch-making system, with the aid of in vitro evolution theory and PCR technology. This system allows us to find translational enhancer motifs on any given mRNA molecules. Comparative analyses of the enhancer motifs thus far obtained revealed their common characteristics ; position, sequence and strength of then are different according to the presence or absence of 5' cap and 3' poly(A) tail.

Report

(4 results)
  • 1999 Annual Research Report   Final Research Report Summary
  • 1998 Annual Research Report
  • 1997 Annual Research Report
  • Research Products

    (10 results)

All Other

All Publications (10 results)

  • [Publications] Yamamoto Y.Y.,Y.Kondo,A.Kato,H.Tsuji and J.Obokata: "Light responsive elements of tobacco PSI-D gene are located both upstream and within the transcribed regionl"Plant Journal. 12・2. 255-265 (1997)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1999 Final Research Report Summary
  • [Publications] Nakamura M. and J. Obokata: "Analysis of the light-responsive elements of tobcco psaDb gene using a transient expression system"Photosynthesis : Mechanisms and Effects (ed. by G.Garab). Vol.IV. 2797-2800 (1998)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1999 Final Research Report Summary
  • [Publications] Miyamoto T., T.Nakamura,I.Nagao and J.Obokata: "Quantitative analysis of the transiently expressed mRNA level in particle bombarded tobacco seedlings"Plant Molecular Biology Reporter. 18・2. 101-107 (2000)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1999 Final Research Report Summary
  • [Publications] Nakamura M.T.Tsunoda and J.Obokata: "Photosynthesis nuclear genes generally lack TATA-box: a tobacco photosystem I gene responds to light through an initiator"Plant Journal. (発表予定).

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1999 Final Research Report Summary
  • [Publications] Yamamoto, Y.Y., Y. Kondo, A. Kato, H. Tsuji and J. Obokata: "Light responsive elements of tabacco PSI-D gene are located both upstream and within the transcribed region"Plant J.. 12-2. 255-265 (1997)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1999 Final Research Report Summary
  • [Publications] Nakamura, M. and J. Obokata: "Analysis of the light-responsive elements of tobacco psaDb gene using a transient expression system"Photosynthesis : Mechanisms and Effects (ed. By G. Garab). IV. 2797-2800 (1998)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1999 Final Research Report Summary
  • [Publications] Miyamoto, T., T. Nakamura, I. Nagao, and J. Obokata: "Quantitative analysis of the transiently expressed mRNA level in particle bombarded tobacco seedlings"Plant Mol. Biol. Rep.. 18-2. 101-107 (2000)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1999 Final Research Report Summary
  • [Publications] Nakamura, M., T. Tsunoda and J. Obokata: "Photosynthesis nuclear genes generally lack TATA-box : a tobacco photosystem I gene respond to light through an initiator"Plant J.. (in press).

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1999 Final Research Report Summary
  • [Publications] Nakamura,M. and J.Obokata: "Analysis of the light-responsive elements of tobacco psaDb gene using a transient expression ststem." Proceedings of the XIth International Congress on Photosynthesis.(印刷中).

    • Related Report
      1998 Annual Research Report
  • [Publications] Yamamoto,Y., Kondo,Y., Kato,A., Taguchi,H. and J.Obokata: "Light-responsive elements of the tobacco PSI-D gene are located both upstream and,within the transcribed" The PLANT Jarnal. 12(2). 255-265 (1997)

    • Related Report
      1997 Annual Research Report

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Published: 1998-04-01   Modified: 2016-04-21  

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