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Structure and nuclease resistance mechanism of non-natural DNA aptamer drugs that inhibit blood coagulation function

Research Project

Project/Area Number 21K12123
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeMulti-year Fund
Section一般
Review Section Basic Section 62010:Life, health and medical informatics-related
Research InstitutionThe University of Electro-Communications

Principal Investigator

Watanabe Shinichi  電気通信大学, 国際教育センター, 特任教授 (60210902)

Co-Investigator(Kenkyū-buntansha) 瀧 真清  電気通信大学, 大学院情報理工学研究科, 教授 (70362952)
山越 智健  電気通信大学, レーザー新世代研究センター, 研究員 (30801245)
宮下 尚之  近畿大学, 生物理工学部, 准教授 (20452162)
Project Period (FY) 2021-04-01 – 2024-03-31
Project Status Completed (Fiscal Year 2023)
Budget Amount *help
¥3,900,000 (Direct Cost: ¥3,000,000、Indirect Cost: ¥900,000)
Fiscal Year 2023: ¥780,000 (Direct Cost: ¥600,000、Indirect Cost: ¥180,000)
Fiscal Year 2022: ¥780,000 (Direct Cost: ¥600,000、Indirect Cost: ¥180,000)
Fiscal Year 2021: ¥2,340,000 (Direct Cost: ¥1,800,000、Indirect Cost: ¥540,000)
KeywordsDNA Aptamer / DNA Covalent Aptamer / TBDcA / Combinatorial Screening / DNA aptamer / TBA/thrombin / DNA・コバレント・アプタマーTBDcA / 非天然型DNAアプタマー / TBA / G-quadruplex
Outline of Research at the Start

DNAアプタマーはタンパク質などの標的分子に特異的に結合するDNA断片で、SELEX法で人工的に進化させて、その特性を著しく強化できる。創薬の観点から重要である。通常自然に存在する4つのヌクレオチドで構成さるが、反応特性のバリエーションを増やしたり体内での分解に対する耐性を強化したりする目的で非天然型の検討は有用である。具体的には、トロンビンに特異的に結合して血液凝固機能を阻害する非天然型DNAアプタマーを理論的に考察する。天然型のTBAを例題として、各々の核酸を非天然型アノマーで置き換える計32767通りの配列の中から、構造安定性、ヌクレアーゼ耐性、特異的結合能の3点において最適な解を探る。

Outline of Final Research Achievements

TBA is a DNA aptamer (single-stranded DNA) that binds to thrombin and acts as an anticoagulant. It has the advantages of high specificity, non-immunogenicity, and the ability to have its drug effect nullified by its complementary strand.
The challenge is that they are easily degraded by nucleases present in serum. We performed MD calculations to investigate the stability of non-natural TBAs generated by replacing some natural DNAs with non-natural ones. Moreover, TBA modified with SO2F molecules (TBDcA) was synthesized experimentally and covalently bound to thrombin. TBDcA was found to be nuclease-resistant and its binding strength was enhanced by covalent binding while maintaining the drug effect.

Academic Significance and Societal Importance of the Research Achievements

TBAを始めとする核酸(DNA・RNA)アプタマーはSELEX法によって進化論的に作製され、標的分子に対する高い特異性を獲得するだけでなく、抗薬物抗体が生じ難く、相補鎖によって容易に中和でき安全である。薬剤としては極めて魅力的な性質を持っていると言える。本研究のTBDcAを例とする共有結合型修飾は、核酸アプタマーの弱点であるヌクレアーゼによる分解・排出を克服できると考えられる。今後応用領域を拡大する上で有望であり、社会的意義は高い。また、結晶化の困難な核酸アプタマーの構造の理解に向けたfoldingおよびunfoldingに関する動力学の理解は学術面での新展開にも繋がると期待される。

Report

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

    (15 results)

All 2024 2023 2022 2021

All Journal Article (4 results) (of which Int'l Joint Research: 2 results,  Peer Reviewed: 4 results,  Open Access: 2 results) Presentation (11 results) (of which Int'l Joint Research: 2 results)

  • [Journal Article] bioTCIs: Middle-to-Macro Biomolecular Targeted Covalent Inhibitors Possessing Both Semi-Permanent Drug Action and Stringent Target Specificity as Potential Antibody Replacements2023

    • Author(s)
      Yang Jay、Tabuchi Yudai、Katsuki Riku、Taki Masumi
    • Journal Title

      International Journal of Molecular Sciences

      Volume: 24 Issue: 4 Pages: 3525-3525

    • DOI

      10.3390/ijms24043525

    • Related Report
      2023 Annual Research Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] Relative Nuclease Resistance of a DNA Aptamer Covalently Conjugated to a Target Protein2022

    • Author(s)
      Tabuchi Yudai、Yang Jay、Taki Masumi
    • Journal Title

      International Journal of Molecular Sciences

      Volume: 23 Issue: 14 Pages: 7778-7778

    • DOI

      10.3390/ijms23147778

    • Related Report
      2022 Research-status Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] Dual-channel scattering problem in the cavity-like potential2022

    • Author(s)
      Tomotake Yamakoshi and Shinichi Watanabe
    • Journal Title

      European Journal of Physics

      Volume: 43 Issue: 3 Pages: 035401-035401

    • DOI

      10.1088/1361-6404/ac4e63

    • Related Report
      2021 Research-status Report
    • Peer Reviewed
  • [Journal Article] Direct Combinatorial Screening of a Target-Specific Covalent Binding Peptide: Activation of the Warhead Reactivity in a Pseudo-Catalytic Microenvironment2022

    • Author(s)
      Yudai Tabuchi, Riku Katsuki, Yuji Ito, and Masumi Taki
    • Journal Title

      Peptide Science 2021: Y. Hayashi (Ed.) The Japanese Peptide Society

      Volume: 2021 Pages: 15-16

    • Related Report
      2021 Research-status Report
    • Peer Reviewed
  • [Presentation] AUTOMATED METHOD FOR PROPOSING MUTANT SEQUENCES IN A SMALL DOMAIN USING A PROTEIN STRUCTURE-BASED DEEP NEURAL NETWORK2024

    • Author(s)
      Naoyuki Miyashita*, and Kazuya Iwano
    • Organizer
      68th Annual Meeting of the Biophysical Society
    • Related Report
      2023 Annual Research Report
    • Int'l Joint Research
  • [Presentation] 中分子共有結合薬剤(bioTCI):ペプチド型TCIの直接選択とアプタマーのTCI化2023

    • Author(s)
      瀧真清
    • Organizer
      第17回バイオ関連化学シンポジウム
    • Related Report
      2023 Annual Research Report
  • [Presentation] PDBデータとDeep Neural Networkを用いたタンパク質の一部分の形状からアミノ酸配列を設計する手法の提案2023

    • Author(s)
      岩野和哉, 塩田優真, 宮下尚之*
    • Organizer
      日本物理学会第78回年次大会
    • Related Report
      2023 Annual Research Report
  • [Presentation] Deep Neural NetworkとAlphaFold2及びMDシミュレーションを用いたタンパク質の部分配列デザインプロトコルの開発2023

    • Author(s)
      岩野和哉, 中条貴裕, 塩田優真, 宮下尚之*
    • Organizer
      第37回分子シミュレーション討論会
    • Related Report
      2023 Annual Research Report
  • [Presentation] 共有結合型ペプチド薬剤とGST二量体との相互作用機構2023

    • Author(s)
      松倉里紗, 瀧真清, 宮下尚之, 渡辺信一, Jay Yang
    • Organizer
      日本物理学会2023年春季大会, オンライン開催, 3/22-25, 2023
    • Related Report
      2022 Research-status Report
  • [Presentation] MOLECULAR DYNAMICS STUDY OF THE MECHANISM OF THE CLIENT UNFOLDED PROTEIN DELIVERY FROM HSP40 TO HSP702023

    • Author(s)
      Lisa Matsukura, Naoyuki Miyashita
    • Organizer
      Biophysical Society Annual Meeting BPS2023, San Diego (USA), 2/18-22, 2023
    • Related Report
      2022 Research-status Report
    • Int'l Joint Research
  • [Presentation] Molecular dynamics study of the interaction between a GST dimer and a novel peptidic covalent aptamer2022

    • Author(s)
      Lisa Matsukura, Naoyuki Miyashita, Masumi Taki, Shinichi Watanabe, Jay Yang
    • Organizer
      CBI学会2022年大会, タワーホール船堀, 10/25-27, 2022
    • Related Report
      2022 Research-status Report
  • [Presentation] HSP40 binding affects the stability of HSP702022

    • Author(s)
      Lisa Matsukura, Naoyuki Miyashita
    • Organizer
      第60回日本生物物理学会, 函館アリーナ・函館市民会館, 9/28-30, 2022
    • Related Report
      2022 Research-status Report
  • [Presentation] ペプチド型共有結合薬剤とGSTタンパク質との結合構造に関する分子動力学シミュレーション2022

    • Author(s)
      松倉里紗, 瀧真清,宮下尚之,渡辺信一
    • Organizer
      日本物理学会2022年秋季大会,東京工業大学,9/12-15, 2022
    • Related Report
      2022 Research-status Report
  • [Presentation] Inhibition of thrombin activity by a covalent-binding aptamer and reversal by the complementary strand antidote2021

    • Author(s)
      田淵 雄大、ヤン ジェイ、瀧 真清
    • Organizer
      日本核酸医薬学会年会(オンライン)
    • Related Report
      2021 Research-status Report
  • [Presentation] Design, Selection, and Engineering of Targeted Hybrid-Middle Molecules via 10BASEd-T / NEXT-A Reactions2021

    • Author(s)
      Masumi Taki
    • Organizer
      PACIFICHEM@Middle molecular strategy for regulation of protein-protein & protein-biomolecule interactions (#370)オンライン
    • Related Report
      2021 Research-status Report

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

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