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2006 Fiscal Year Final Research Report Summary

Mechanism of photoactivation of photoactivated adenylyl cyclase (PAC), a novel blue-light receptor, and mechanism of photocontrol of cellular functions.

Research Project

Project/Area Number 15207006
Research Category

Grant-in-Aid for Scientific Research (A)

Allocation TypeSingle-year Grants
Section一般
Research Field 植物生理・分子
Research InstitutionThe Graduate University for Advanced Studies (2004-2006)
Okazaki National Research Institutes (2003)

Principal Investigator

WATANABE Masakatsu  The Graduate University for Advanced Studies, School of Advanced Sciences, Professor, 先導科学研究科, 教授 (40124226)

Co-Investigator(Kenkyū-buntansha) KANDORI Hideki  Nagoya Institute for Technology, School of Engeneering Sciences, Professor, 工学研究科, 教授 (70202033)
Project Period (FY) 2003 – 2006
Keywordsblue-light sensor / photoactivated enzyme / cAMP / Euglena / photobehavior / PAC / flavin
Research Abstract

Photoactivated adenylyl cyclase (PAC) (Iseki et al. 2002 Nature) is a blue-light sensor protein responsible for photoavoidance behavior in a eukaryotic unicellular flagellate alga Euglena gracilis. It is composed of flavin-binding, light sensing domains and adenylyl cyclase catalytic domains so that it produces cAMP, a versatile intracellular second messenger, in response to blue-light irradiation.
By molecular phylogenetic analyses of homologues fo PAC in various euglenoids, it was suggested that PAC was introduced into Euglena almost concomitantly with the secondary symbiotic introduction of its chroloplasts (Koumura et al. 2004 Photochem Photobiol Sci).
By analyses of the photoactivation kinetics of purified PAC from Euglena, action spectrum and responsively to repeated short pulse irradiations were determined as well as intracellular cAMP concentration time courses. These results were in accordance with the corresponding in vivo photobehavior characteristics (Yoshikawa et al. 2005 Ph … More otochem Photobiol Sci).
By analyses of the photochemical cycle kinetics of a flavin-binding domain heterologously expressed in E. coil, threshold light flounce rate, quantum efficiency as well as half life of dark recovery ware determined which were in general similarity to other members of the so-called BLUF family of flavin-binding domains, mostly of prokaryotic origins (Ito et al. 2005 Photochem Photobiol Sci).
The unique distinguishing feature of PAC to act as a light sensor having intrinsic effector function of adenylyl cyclase provide promising possibilities to be used as a tool to photomanipulate various cAMP-dependent biological functions including neural and reproductive processes if it is successfully expressed functionally in heterologous systems (Iseki et al. 2002 Nature). This possibility was in fact realized by successful functional expression of PAC in frog oocytes, human cultured cells as well as in fly brains, particularly in which grooming behavior of the fly individual was specifically photosuppressed by external light irradiation (Schroeder-Lang 2007 Nature Methods). Less

  • Research Products

    (15 results)

All 2007 2006 2005 2004 2003

All Journal Article (12 results) Book (3 results)

  • [Journal Article] Fast manipulation of cellular cAMP level by light in vivo2007

    • Author(s)
      Schroder-Lang, S.
    • Journal Title

      Nature Methods 4(1)

      Pages: 39-42

    • Description
      「研究成果報告書概要(和文)」より
  • [Journal Article] Fast manipulation of cellular cAMP level by light in vivo.2007

    • Author(s)
      Schroder-Lang, S., Schwarzel, M., Seifert, R., Strunker, T., Kateriya, S., Looser, J., Watanabe, M., Kaupp, U.B., Hegemann, P., Nagel, G.
    • Journal Title

      Nat.Methods. 4 (1)

      Pages: 39-42

    • Description
      「研究成果報告書概要(欧文)」より
  • [Journal Article] Kinetic analysis of the activation of photoactivated adenylyl cyclase (PAC), a blue-light receptor for photomovements of Euglena.2005

    • Author(s)
      Yoshikawa, S.
    • Journal Title

      Photochemical & Photobiological Sciences 4 (9)

      Pages: 727-731

    • Description
      「研究成果報告書概要(和文)」より
  • [Journal Article] Biochemical and functional characterization of BLUF-type flavin-binding proteins of two species of cyanobacteria.2005

    • Author(s)
      Okajima, K.
    • Journal Title

      Journal of Biochemistry 137 (6)

      Pages: 441-450

    • Description
      「研究成果報告書概要(和文)」より
  • [Journal Article] Photocycle features of heterologously expressed and assembled eukaryotic flavin-binding BLUF domains of photoactivated adenylyl cyclase (PAC), a blue-light receptor in Euglena gracilis.2005

    • Author(s)
      Ito, S.
    • Journal Title

      Photochemical & Photobiological Sciences 4(9)

      Pages: 762-769

    • Description
      「研究成果報告書概要(和文)」より
  • [Journal Article] Kinetic analysis of the activation of photoactivated adenylyl cyclase (PAC), a blue-light receptor for photomovements of Euglena.2005

    • Author(s)
      Yoshikawa, S., Suzuki, T., Watanabe, M., Iseki, M.
    • Journal Title

      Photochem.Photobiol.Sci 4 (9)

      Pages: 727-731

    • Description
      「研究成果報告書概要(欧文)」より
  • [Journal Article] Biochemical and functional characterization of BLUF-type flavin-binding proteins of two species of cyanobacteria.2005

    • Author(s)
      Okajima, K., Yoshihara, S., Fukushima, Y., Geng, X., Katayama, M., Higashi, S., Watanabe, M., Sato, S., Tabata, S., Shibata, Y., Itoh, S., Ikeuchi, M.
    • Journal Title

      J.Biochem. 137 (6)

      Pages: 441-450

    • Description
      「研究成果報告書概要(欧文)」より
  • [Journal Article] Photocycle features of heterologously expressed and assembled eukaryotic flavin-binding BLUF domains of photoactivated adenylyl cyclase (PAC), a blue-light receptor in Euglena gracilis.2005

    • Author(s)
      Ito, S., Murakami, A., Sato, K., Nishina, Y., Shiga, K., Takahashi, T., Higashi, S., Iseki, M., Watanabe, M.
    • Journal Title

      Photochem.Photobiol.Sci. 4 (9)

      Pages: 762-769

    • Description
      「研究成果報告書概要(欧文)」より
  • [Journal Article] The origin of photoactivated adenylyl cyclase (PAC), the Euglena blue-light receptor : phylogenetic analysis of orthologues of PAC subunits from several euglenoids and trypanosome-type adenylyl cyclases from Euglena gracilis.2004

    • Author(s)
      Koumura, Y.
    • Journal Title

      Photochemical & Photobiological Sciences 3 (6)

      Pages: 580-586

    • Description
      「研究成果報告書概要(和文)」より
  • [Journal Article] The origin of photoactivated adenylyl cyclase (PAC), the Euglena blue-light receptor : phylogenetic analysis of orthologues of PAC subunits from several euglenoids and trypanosome-type adenylyl cyclases from Euglena gracilis.2004

    • Author(s)
      Koumura, Y., Suzuki, T., Yoshikawa, S., Watanabe, M., Iseki, M.
    • Journal Title

      Photochem.Photobiol.Sci. 3 (6)

      Pages: 580-586

    • Description
      「研究成果報告書概要(欧文)」より
  • [Journal Article] Photoactivated adenylyl cyclase controls phototaxis in the flagellate Euglena gracilis.2003

    • Author(s)
      Ntefidou, M
    • Journal Title

      Plant Physiology 133 (4)

      Pages: 1517-1521

    • Description
      「研究成果報告書概要(和文)」より
  • [Journal Article] Photoactivated adenylyl cyclase controls phototaxis in the flagellate Euglena gracilis.2003

    • Author(s)
      Ntefidou, M., Iseki, M., Watanabe, M., Lebert, M., Hader, D.P.
    • Journal Title

      Plant Physiol. 133 (4)

      Pages: 1517-1521

    • Description
      「研究成果報告書概要(欧文)」より
  • [Book] 天然物化学-植物編-2007

    • Author(s)
      山村 庄亮
    • Total Pages
      446
    • Publisher
      アイピーシー
    • Description
      「研究成果報告書概要(和文)」より
  • [Book] Flavins -Photochemistry and Photobiology2006

    • Author(s)
      Silva, E.
    • Total Pages
      338
    • Publisher
      RSC Publishing
    • Description
      「研究成果報告書概要(和文)」より
  • [Book] Handbook of photosensory receptors2005

    • Author(s)
      Briggs, W. R.
    • Total Pages
      473
    • Publisher
      Willey-VCN
    • Description
      「研究成果報告書概要(和文)」より

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Published: 2008-05-27  

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