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The structural transition of the silk fibroin studied by solid state NMR

Research Project

Project/Area Number 16K17957
Research Category

Grant-in-Aid for Young Scientists (B)

Allocation TypeMulti-year Fund
Research Field Polymer/Textile materials
Research InstitutionUniversity of Fukui

Principal Investigator

Suzuki Yu  福井大学, テニュアトラック推進本部, 講師 (90600263)

Project Period (FY) 2016-04-01 – 2019-03-31
Project Status Completed (Fiscal Year 2018)
Budget Amount *help
¥4,160,000 (Direct Cost: ¥3,200,000、Indirect Cost: ¥960,000)
Fiscal Year 2017: ¥1,170,000 (Direct Cost: ¥900,000、Indirect Cost: ¥270,000)
Fiscal Year 2016: ¥2,990,000 (Direct Cost: ¥2,300,000、Indirect Cost: ¥690,000)
Keywordsシルクフィブロイン / 固体NMR / マジック角回転 / 構造転移 / 絹フィブロイン / NMR / 天然高分子 / 繊維 / NMR
Outline of Final Research Achievements

The structural transition of Bombyx mori silk fibroin at the fiber spinning process was studied by solid state NMR. The preparation of 13C stable isotope labeled liquid silk was optimized. We found that administering the 13C U-glucose mixed with artificial diets during 3rd to 5th at 5th instar silkworms gave the highest 13C labeled liquid silk. Then, the structural transition of liquid silk caused by the centrifugal force of the magic angle spinning installed in the solid state NMR instrument. This study revealed that the structual transition composed of at least two steps. At first, the mobility of Silk I component was gradually decreased. After that, the conformation was changed rapidly from Silk I to Silk II which is mainly an anti-parallel beta-sheet structure.

Academic Significance and Societal Importance of the Research Achievements

本研究成果から、液状絹の13C安定同位体ラベル最適条件の確立により、今後、各種NMR法を用いた絹フィブロインの構造解析における感度向上・試料調製および測定時間短縮という学術的意義が得られた。また、液状絹から絹繊維が形成される過程で、家蚕絹糸腺内において少なくとも2段階の構造転移が起こることを明らかにした。これは、蚕の省エネルギーで環境負荷の低い紡糸プロセスを模倣し、絹のみならず合成繊維の紡糸システムにも適用する上で重要な知見となる。

Report

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

    (8 results)

All 2018 2017 2016

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

  • [Journal Article] Structures of silk fibroin before and after spinning and biomedical applications2016

    • Author(s)
      Suzuki Y.
    • Journal Title

      Polymer Journal

      Volume: 48 Issue: 11 Pages: 1039-1044

    • DOI

      10.1038/pj.2016.77

    • NAID

      40020977584

    • Related Report
      2016 Research-status Report
    • Peer Reviewed / Acknowledgement Compliant
  • [Presentation] 固体NMR法を用いたシルクタンパク質溶液の構造および運動性解析2018

    • Author(s)
      鈴木悠・森江将太・東孝憲
    • Organizer
      第67回高分子討論会
    • Related Report
      2018 Annual Research Report
  • [Presentation] 固体NMR法を用いたシルクタンパク質溶液の構造および運動性解析2018

    • Author(s)
      鈴木悠・森江将太・東孝憲
    • Organizer
      平成30年度繊維学会秋季研究発表会
    • Related Report
      2018 Annual Research Report
  • [Presentation] 固体NMRを用いた加圧下における家蚕液状絹の構造転移解析2018

    • Author(s)
      森江将太・鈴木悠
    • Organizer
      高分子学会北陸支部若手研究発表会
    • Related Report
      2018 Annual Research Report
  • [Presentation] Conformation and dynamics properties of silk fibroin in a silk gland2018

    • Author(s)
      Yu Suzuki, Tetsuo Asakura
    • Organizer
      ACS national meeting, International Symposium on " Structure and Dynamics of Materials via NMR Methods"
    • Related Report
      2017 Research-status Report
    • Int'l Joint Research / Invited
  • [Presentation] 天然液状絹のNMR構造解析2017

    • Author(s)
      鈴木悠、朝倉哲郎
    • Organizer
      第67回 高分子討論会
    • Related Report
      2017 Research-status Report
    • Invited
  • [Presentation] 天然液状絹のNMR構造解析2017

    • Author(s)
      鈴木悠
    • Organizer
      第62回 固体NMR材料フォーラム
    • Related Report
      2017 Research-status Report
    • Invited
  • [Presentation] Conformation of silk fibroins stored in silk glands studied by solution NMR2017

    • Author(s)
      Yu Suzuki, Tetsuo Asakura
    • Organizer
      Sheffield Silk Conference
    • Related Report
      2017 Research-status Report
    • Int'l Joint Research / Invited

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

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