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2012 Fiscal Year Final Research Report

Mechanism of mitochondrial fission: from the initial formation of fission sites to the membrane scission

Research Project

  • PDF
Project/Area Number 23770231
Research Category

Grant-in-Aid for Young Scientists (B)

Allocation TypeMulti-year Fund
Research Field Cell biology
Research InstitutionKyushu University

Principal Investigator

OTERA Hidenori  九州大学, 医学研究院, 助教 (40380612)

Project Period (FY) 2011 – 2012
Keywords生体膜
Research Abstract

Mitochondrial fission is important for maintaining cellular function, and its dysfunction causes aging, neuronal synaptic loss, and cell death in several human neurologic diseases. The major player of mitochondrial fission is a largely cytosolic member of the dynamin family of GTPases Drp1 in mammals. Endogenous Drp1, observed as dotted structures on mitochondria, was clearly decreased and was dispersed in the cytoplasm in Mff RNAi cells concomitant with mitochondrial network extension. In contrast, Mff overexpression induced mitochondrial fragmentation, concomitant with increased Drp1 recruitment to the mitochondria. These observations indicate that Mff functions as a Drp1 receptor to mediate mitochondrial fission. Drp1 might self-assemble via its ability to homo-oligomerize at Mff-containing foci on the mitochondrial surface, forming spiral structures around the mitochondrial tubules. MiD51/MIEF1 interacts with recombinant Drp1 to inhibit its GTPase activity accompanied by Drp1 oligomerization. In contrast, Mff competes with MiD51/MIEF1 to stimulate Drp1 GTPase activity. Taken together, MiD51/MIEF1 seems to bind oligomerized Drp1 and stabilize them at the surface of the mitochondrial membrane in the GTP-locked state to inhibit mitochondrial fission.

  • Research Products

    (7 results)

All 2012 2011 Other

All Journal Article (5 results) Presentation (1 results) Remarks (1 results)

  • [Journal Article] Regulation and physiologic function of GTPases in mitochondrial fusion and fission in mammals.2012

    • Author(s)
      Ishihara N, Otera H, Oka T, Mihara K.
    • Journal Title

      Antioxid Redox Signaling. 2012 Oct 1.

    • URL

      http://online.liebertpub.com/doi/abs/10.1089/ars.2012.4830

  • [Journal Article] Pex5p imports folded tetrameric catalase into peroxisomes by interaction with Pex13p.2012

    • Author(s)
      Otera H, Fujiki Y.
    • Journal Title

      Traffic.

      Pages: 1364-1377

    • DOI

      DOI:10.1111/j.1600-0854.2012.01391.x

  • [Journal Article] Mitochondrial dynamics: functional link with apoptosis.2012

    • Author(s)
      Otera H, Mihara K.
    • Journal Title

      International J. Cell Biol.

    • DOI

      DOI:10.1155/2012/821676

  • [Journal Article] Fis1 acts as mitochondrial recruitment factor for TBC1D15 that involved in regulation of mitochondrial morphology.

    • Author(s)
      Onoue K, Jofuku A, Ban-Ishihara R, Ishihara T, Maeda M, Koshiba T, Itoh T, Fukuda M, Otera H, Oka T, Takano H, Mizushima N, Mihara K, Ishihara N.
    • Journal Title

      J. Cell . Sci.

    • DOI

      DOI:10.1242/jcs.111211

  • [Journal Article] New insights into the function and regulation of mitochondrial fission.

    • Author(s)
      Otera H, Ishihara N, Mihara K.
    • Journal Title

      Biochim Biophys Acta.

    • DOI

      DOI:10.1016/j.bbamcr.2013.02.002

  • [Presentation] ミトコンドリアの分裂を司る分子とその機能2011

    • Author(s)
      大寺秀典、三原勝芳
    • Organizer
      日本生化学会大会 シンポジウム
    • Place of Presentation
      京都
    • Year and Date
      20110000
  • [Remarks]

    • URL

      http://www.med.kyushu-u.ac.jp/seisaseibutupeople/otera.html

URL: 

Published: 2014-09-25  

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