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Preparation of alpaca-derived nanobody which activatites ghrelin receptor and its application to the crystal structure analysis

Research Project

Project/Area Number 16K07281
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeMulti-year Fund
Section一般
Research Field Structural biochemistry
Research InstitutionKurume University

Principal Investigator

Kojima Masayasu  久留米大学, 付置研究所, 教授 (20202062)

Research Collaborator Sawazaki Tatsuya  
Takeda Hiroyuki  
Ito Yuji  
Project Period (FY) 2016-04-01 – 2019-03-31
Project Status Completed (Fiscal Year 2018)
Budget Amount *help
¥4,940,000 (Direct Cost: ¥3,800,000、Indirect Cost: ¥1,140,000)
Fiscal Year 2018: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000)
Fiscal Year 2017: ¥1,950,000 (Direct Cost: ¥1,500,000、Indirect Cost: ¥450,000)
Fiscal Year 2016: ¥1,950,000 (Direct Cost: ¥1,500,000、Indirect Cost: ¥450,000)
Keywordsペプチドホルモン / グレリン / グレリン受容体 / GPCR / 結晶構造解析 / 膜タンパク質 / ナノボディ / アルパカ / 結晶構造 / ペプチドホルモン受容体 / 立体構造認識 / GPCR結晶化 / パンニング
Outline of Final Research Achievements

Alpaca nanobodies that specifically recognize the conformation of the ghrelin receptor have not been obtained yet. It is necessary to continue the screening further in the future. On the other hand, it was possible to obtain a mouse monoclonal antibody against the ghrelin receptor, and using this antibody for a crystallization, it was possible to obtain a structure of the inactive ghrelin receptor. It was assumed that the phenylalanine cluster between TM6 and TM7 interacts with the fatty acid modifying group of ghrelin, thereby changing the ghrelin receptor to the active form. This clarified one of the reasons why octanoate of ghrelin is required for receptor activity.

Academic Significance and Societal Importance of the Research Achievements

グレリンは典型的なGタンパク質共役型受容体(GPCR)であるグレリン受容体に結合して、その生理作用を現す。グレリンはペプチド・ホルモンであるが、N末端から3番目のセリン残基が中鎖脂肪酸のオクタン酸によって修飾されており、しかもこのオクタン酸が受容体の活性化に必須であるという極めて珍しい構造をしている。今回の研究によって、なぜグレリンがペプチド部分だけでは受容体を活性化できず、オクタン酸の修飾があって始めて受容体を活性化できるのかが明らかになった。この知見はグレリン受容体の新しいアゴニストやアンタゴニストの合成に応用でき、摂食障害や食欲不振症などへの応用が期待される。

Report

(4 results)
  • 2018 Annual Research Report   Final Research Report ( PDF )
  • 2017 Research-status Report
  • 2016 Research-status Report
  • Research Products

    (13 results)

All 2019 2018 2017 2016

All Journal Article (5 results) (of which Int'l Joint Research: 2 results,  Peer Reviewed: 5 results,  Open Access: 4 results,  Acknowledgement Compliant: 2 results) Presentation (7 results) (of which Invited: 3 results) Book (1 results)

  • [Journal Article] Helicobacter pylori Vacuolating Cytotoxin A Causes Anorexia and Anxiety via Hypothalamic Urocortin 1 in Mice2019

    • Author(s)
      Suzuki H, Ataka K, Asakawa A, Cheng KC, Ushikai M, Iwai H, Yagi T, Arai T, Yahiro K, Yamamoto K, Yokoyama Y, Kojima M, Yada T, Hirayama T, Nakamura N, Inui A
    • Journal Title

      Sci Rep

      Volume: 9 Issue: 1 Pages: 6011-6011

    • DOI

      10.1038/s41598-019-42163-4

    • Related Report
      2018 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] Luqin-like RYamide peptides regulate food-evoked responses in C. elegans2017

    • Author(s)
      Ohno H, Yoshida M, Sato T, Kato J, Miyazato M, Kojima M, Ida T, Iino Y
    • Journal Title

      Elife

      Volume: 6. pii Pages: 1-23

    • DOI

      10.7554/elife.28877

    • Related Report
      2017 Research-status Report
    • Peer Reviewed / Open Access
  • [Journal Article] Ghrelin improves dystonia and tremor in patients with Rett syndrome: A pilot study2017

    • Author(s)
      Yuge K, Hara M, Okabe R, Nakamura Y, Okamura H, Nagamitsu S, Yamashita Y, Orimoto K, Kojima M, Matsuishi T
    • Journal Title

      J Neurol Sci

      Volume: 377 Pages: 219-223

    • DOI

      10.1016/j.jns.2017.04.022

    • Related Report
      2017 Research-status Report 2016 Research-status Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] 1.Ghrelin activation and neuropeptide Y elevation in response to medium chain triglyceride administration in anorexia nervosa patients2017

    • Author(s)
      Kawai K, Nakashima M, M Kojima M, Yamashita S, Takakura S, Shimizu M, Kubo C,Sudo N
    • Journal Title

      Clinical nutrition ESPEN

      Volume: 17 Pages: 100-104

    • DOI

      10.1016/j.clnesp.2016.10.001

    • Related Report
      2016 Research-status Report
    • Peer Reviewed / Open Access / Int'l Joint Research / Acknowledgement Compliant
  • [Journal Article] Ghrelin O-acyltransferase (GOAT), a specific enzyme that modifies ghrelin with a medium-chain fatty acid2016

    • Author(s)
      Kojima M, Hamamoto A, Sato T
    • Journal Title

      J Biochem

      Volume: 160 Issue: 4 Pages: 189-194

    • DOI

      10.1093/jb/mvw046

    • Related Report
      2016 Research-status Report
    • Peer Reviewed / Acknowledgement Compliant
  • [Presentation] グレリン研究のこれから2018

    • Author(s)
      児島将康
    • Organizer
      第36回内分泌代謝学サマーセミナー
    • Related Report
      2018 Annual Research Report
    • Invited
  • [Presentation] 高齢者の食欲と健康 ~摂食亢進ホルモンのグレリンの役割~2018

    • Author(s)
      児島将康
    • Organizer
      第6回日本介護予防・健康づくり学会大会
    • Related Report
      2018 Annual Research Report
    • Invited
  • [Presentation] 摂食亢進ホルモンのグレリンと生体内のエネルギー代謝2018

    • Author(s)
      児島将康
    • Organizer
      第18回日本ミトコンドリア学会年会
    • Related Report
      2018 Annual Research Report
    • Invited
  • [Presentation] モデル生物における新規生理活性ペプチドの発見と臓器相関2017

    • Author(s)
      児島将康
    • Organizer
      生理学研究所研究会「臓器相関」
    • Related Report
      2017 Research-status Report
  • [Presentation] 放射線被ばく後のグレリン産生・分泌動態とグレリンによる血球保護効果の検討2016

    • Author(s)
      西芳寬、那須沙織、細田洋司、御船弘治、久志野彰寛、田中永一郎、児島将康
    • Organizer
      第89回日本内分泌学会学術総会
    • Place of Presentation
      京都国際会館
    • Related Report
      2016 Research-status Report
  • [Presentation] グレリン遺伝子欠損マウスの制限給餌下における自発運動について2016

    • Author(s)
      御船弘治、原健人、坂井勇介、岩田慎平、西芳寬、田尻祐司、児島将康、満園良一
    • Organizer
      第89回日本内分泌学会学術総会
    • Place of Presentation
      京都国際会館
    • Related Report
      2016 Research-status Report
  • [Presentation] 摂餌に関する記憶学習およぼ探索行動に及ぼすグレリンの役割2016

    • Author(s)
      佐藤貴弘、大石佳苗、児島将康
    • Organizer
      第89回日本内分泌学会学術総会
    • Place of Presentation
      京都国際会館
    • Related Report
      2016 Research-status Report
  • [Book] 下垂体疾患診療マニュアル2016

    • Author(s)
      児島将康(分担)
    • Total Pages
      285
    • Publisher
      診断と治療社
    • Related Report
      2016 Research-status Report

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Published: 2016-04-21   Modified: 2020-03-30  

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