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Analysis of physiological meanings of mitochondrial localization of yeast tRNA splicing endonuclease

Research Project

Project/Area Number 12680609
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeSingle-year Grants
Section一般
Research Field Structural biochemistry
Research InstitutionNagoya University

Principal Investigator

YOSHIHI Tbhn  Nagova Univ. Res., Ctr. Of Material Science,Assoc, Prof, 物質科学国際研究センター, 助教授 (60212312)

Project Period (FY) 2000 – 2001
Project Status Completed (Fiscal Year 2001)
Budget Amount *help
¥1,100,000 (Direct Cost: ¥1,100,000)
Fiscal Year 2001: ¥1,100,000 (Direct Cost: ¥1,100,000)
KeywordstRNA / splicing / nuclear-cytoplasmic transpo / endonuclease / mitochondria
Research Abstract

Primary transcripts of nuclear-encoded tRNA genes receive various processing to become mature tRNA functional for translation in cytoplasm. Among such processing, splicing is essential for maturation of intron-containing pre-RNAs.The splicing of pre-tRNAs has been believed to occur in the nuclei. In yeast, Saccharomyces cerevisiae, tRNA splicing endonuclease that cleaves exon-intron junctions of pre tRNAs consists offour subunits, Sen54p, Sen2p, Sen34p and SenlSp, and has been supposed as an integral membrane protein of inner uclear envelope. Through this research project, we show that the majority of Sen2p, Sen54p and the endonuclease activity are not localized in the nuclei but associated on the surface of mitochondria. Yeast mutant cells deficient in the endonuclease activity accumulate unspliced pre-tRNAs in cytosol. A Sen54p derivative artificially fixed on the mitochondrial surface by fusing a itochondrial targeting signal and a transmembrane domain ofTom70p (Tom70N), an integral membrane protein of outer mitochondrial membrane, can functionally replace authentic Sen54p. On the other hand, Sen54p derivatives with nuclear localization signals are not fully active. Partial deletion of the mitochondrial targeting signal in Sen54p compromises its function, but addition of Tom70N to this deletion mutant suppresses its defect. These results strongly suggest that an early step of tRNA splicing is not a nuclear event and that pre-tRNAs take a complex route via the mitochondrial surface during their maturation.

Report

(3 results)
  • 2001 Annual Research Report   Final Research Report Summary
  • 2000 Annual Research Report
  • Research Products

    (3 results)

All Other

All Publications (3 results)

  • [Publications] 吉久徹, 遠藤斗志也: "植物生理学講座第3巻 光合成(佐藤公行編) 5.5節 葉緑体包膜およびチラコイド膜を介する物質輸送とその制御"朝倉書店(印刷中). (2001)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] Tohru Yoshihisa and Toshiya Endo: "§5.5 Transport and its regulation through chloroplast envelope and thyiakoidal membrane、in Plant Physiology vol. 3, Photosynthesis ', K. Satojed"Asakurashoten (in press). (2001)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] 吉久徹, 遠藤斗志也: "植物生理学講座第3巻 光合成(佐藤公行編) 5.5節 葉緑体包膜およびチラコイド膜を介する物質輸送とその制御"朝倉書店(印刷中). (2001)

    • Related Report
      2001 Annual Research Report

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Published: 2001-04-01   Modified: 2016-04-21  

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