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Structural and functional elucidation of L-type amino acid transporter under lipid environment

Research Project

Project/Area Number 21K15031
Research Category

Grant-in-Aid for Early-Career Scientists

Allocation TypeMulti-year Fund
Review Section Basic Section 43020:Structural biochemistry-related
Research InstitutionYokohama City University

Principal Investigator

Lee Yongchan  横浜市立大学, 生命医科学研究科, 助教 (00894932)

Project Period (FY) 2021-04-01 – 2024-03-31
Project Status Completed (Fiscal Year 2023)
Budget Amount *help
¥4,680,000 (Direct Cost: ¥3,600,000、Indirect Cost: ¥1,080,000)
Fiscal Year 2023: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000)
Fiscal Year 2022: ¥1,560,000 (Direct Cost: ¥1,200,000、Indirect Cost: ¥360,000)
Fiscal Year 2021: ¥2,080,000 (Direct Cost: ¥1,600,000、Indirect Cost: ¥480,000)
Keywordsアミノ酸輸送体 / クライオ電子顕微鏡 / ナノディスク / 構造解析 / 生体膜
Outline of Research at the Start

L型アミノ酸輸送体は、ロイシンやフェニルアラニンなどの疎水性アミノ酸を運ぶ膜輸送体タンパク質である。L型アミノ酸輸送体はがん細胞や脳血液関門に多く発現していることから、抗がん剤やパーキンソン病治療薬など、多様な薬物の標的とされている。本研究では、このタンパク質が本来機能する、脂質二重膜に埋め込まれた状態での構造を捉えることで、脂質環境下での分子メカニズムを解明する。また、種々の阻害剤との結合状態を可視化することにより、L型アミノ酸輸送体を標的とする抗がん剤に関する構造的知見を得る。

Outline of Final Research Achievements

L-type amino acid transporter 1 (LAT1) is a neutral amino acid transporter expressed in the blood-brain barrier and many types of cancer cells and is involved in the transport of hormones and anticancer drugs across the cell membrane. We performed electron cryo-microscopy analyses of LAT1 using the membrane mimetic environment called nanodisc to understand the substrate and drug binding modes. By preparing transporter-ligand complexes with various substrates and inhibitors and performing high-resolution single-particle analyses, we determined the structures of LAT1 in complex with selective and non-selective inhibitors. These results shed light on the structural basis of how anticancer compounds bind to and inhibit LAT1.

Academic Significance and Societal Importance of the Research Achievements

本研究では、界面活性剤下あるいは脂質環境下で得られるLAT1の構造、とくに阻害薬の結合の挙動に大きな違いがあることが明らかとなった。これは、ここ数年で報告された膜輸送体構造全般の再解釈を促す重要な発見といえる。本研究で得られた阻害薬の作動機構に関する知見は、LAT1を標的とする薬剤候補の改良に役立つことが期待される。

Report

(4 results)
  • 2023 Annual Research Report   Final Research Report ( PDF )
  • 2022 Research-status Report
  • 2021 Research-status Report
  • Research Products

    (9 results)

All 2023 2022 2021

All Journal Article (2 results) (of which Int'l Joint Research: 1 results,  Open Access: 2 results) Presentation (7 results) (of which Int'l Joint Research: 1 results,  Invited: 6 results)

  • [Journal Article] Structural basis of anticancer drug recognition and amino acid transport by LAT12023

    • Author(s)
      Lee Yongchan、Jin Chunhuan、Ohgaki Ryuichi、Xu Minhui、Ogasawara Satoshi、Warshamanage Rangana、Yamashita Keitaro、Murshudov Garib、Nureki Osamu、Murata Takeshi、Kanai Yoshikatsu
    • Journal Title

      bioRxiv

      Volume: -

    • DOI

      10.1101/2023.12.03.567112

    • Related Report
      2023 Annual Research Report
    • Open Access
  • [Journal Article] Ca2+-mediated higher-order assembly of b0,+AT-rBAT is a key step for system b0,+ biogenesis and cystinuria2021

    • Author(s)
      Lee Yongchan、Wiriyasermkul Pattama、Moriyama Satomi、Mills Deryck J.、Kuehlbrandt Werner、Nagamori Shushi
    • Journal Title

      bioRxiv

      Volume: -

    • DOI

      10.1101/2021.05.06.443019

    • Related Report
      2021 Research-status Report
    • Open Access / Int'l Joint Research
  • [Presentation] 哺乳類が持つヘテロ複合体型アミノ酸輸送体の構造解析2023

    • Author(s)
      李勇燦
    • Organizer
      第23回日本蛋白質科学会年会
    • Related Report
      2023 Annual Research Report
    • Invited
  • [Presentation] Structural studies of SLC amino acid transporters relevant to health and diseases2023

    • Author(s)
      Yongchan Lee
    • Organizer
      International Conference on Biological Physics (ICBP2023)
    • Related Report
      2023 Annual Research Report
    • Invited
  • [Presentation] クライオ電子顕微鏡によるアミノ酸輸送体の構造薬学的研究2023

    • Author(s)
      李勇燦
    • Organizer
      日本顕微鏡学会 第66回シンポジウム
    • Related Report
      2023 Annual Research Report
    • Invited
  • [Presentation] Structural Studies of Membrane Transporters Relevant to Health and Diseases2022

    • Author(s)
      Yongchan Lee
    • Organizer
      2022 China-Japan-Korea Youth Forum
    • Related Report
      2022 Research-status Report
    • Int'l Joint Research / Invited
  • [Presentation] Cryo-EM Structure of L-type Amino Acid Transporter 2 (LAT2)2022

    • Author(s)
      Saki Takahashi, Yongchan Lee, Satoshi Ogasawara, Takeshi Murata, Yoshikatsu Kanai, Tomohiro Nishizawa
    • Organizer
      第45回日本分子生物学会年会
    • Related Report
      2022 Research-status Report
  • [Presentation] Structural mechanisms of heteromeric amino acid transporters revealed by cryo-EM and insights into cystinuria2021

    • Author(s)
      Yongchan Lee
    • Organizer
      第94回 日本生化学会大会
    • Related Report
      2021 Research-status Report
    • Invited
  • [Presentation] 脂質二重膜に埋め込まれた膜タンパク質のCryo-EM構造解析2021

    • Author(s)
      李 勇燦
    • Organizer
      第44回 日本分子生物学会年会
    • Related Report
      2021 Research-status Report
    • Invited

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Published: 2021-04-28   Modified: 2025-01-30  

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