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Biosynthesis of alfa-methylated polyhydroxyalkanoates by constructing artificial pathway and characterization of their thermal properties

Research Project

Project/Area Number 21H03640
Research Category

Grant-in-Aid for Scientific Research (B)

Allocation TypeSingle-year Grants
Section一般
Review Section Basic Section 64030:Environmental materials and recycle technology-related
Research InstitutionTokyo Institute of Technology

Principal Investigator

Tsuge Takeharu  東京工業大学, 物質理工学院, 教授 (70332260)

Project Period (FY) 2021-04-01 – 2024-03-31
Project Status Completed (Fiscal Year 2023)
Budget Amount *help
¥17,550,000 (Direct Cost: ¥13,500,000、Indirect Cost: ¥4,050,000)
Fiscal Year 2023: ¥2,470,000 (Direct Cost: ¥1,900,000、Indirect Cost: ¥570,000)
Fiscal Year 2022: ¥6,760,000 (Direct Cost: ¥5,200,000、Indirect Cost: ¥1,560,000)
Fiscal Year 2021: ¥8,320,000 (Direct Cost: ¥6,400,000、Indirect Cost: ¥1,920,000)
Keywords生分解性プラスチック / バイオプラスチック / ポリヒドロキシアルカン酸 / バイオポリエステル
Outline of Research at the Start

微生物が合成するバイオポリエステルのうち、3-ヒドロキシ-2-メチルブタン酸(3H2MB)を含むポリマーは、高性能な生分解性プラスチックとして使用できる。しかし、このポリマーは僅かな量しか合成できないため、本研究では3H2MBを含むポリマーを高収量で生産する方法を確立する。

Outline of Final Research Achievements

Biosynthesis of α-methylated polyhydroxyalkanoates (PHAs) was investigated by constructing an artificial pathway in Escherichia coli. By employing a novel ketothiolase Acat3 derived from nematodes, a precursor was synthesized by Claisen condensation of acetyl-CoA and propionyl-CoA, which was then reduced by reductase PhaB to serve as a substrate for the PHA synthase PhaC. As a result, it succeeded in incorporating α-methylated monomers up to approximately 16 mol% into PHA copolymers. The thermal properties of these polymers were characterized, and their crystallization behavior was compared with that of conventional PHAs.

Academic Significance and Societal Importance of the Research Achievements

微生物ポリエステルは、バイオマスを原料とすることによる持続可能性と優れた自然環境中での生分解性から、今後、広く普及が期待されるプラスチックのひとつである。一方で次世代の微生物ポリエステルには、実用的な材料物性を担保しつつ、かつ、結晶化挙動に優れることが求められる。今回合成法を開発したαメチル化PHAは、α炭素のメチル化によって結晶化が迅速に進むようになり、この材料の有用性を示すことができた。これらの成果は、高性能な材料の分子設計を行う上で重要な知見として役立てることができる。

Report

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

    (4 results)

All 2023 2022 2021

All Journal Article (3 results) (of which Int'l Joint Research: 2 results,  Peer Reviewed: 3 results,  Open Access: 2 results) Presentation (1 results) (of which Int'l Joint Research: 1 results)

  • [Journal Article] Thermal and Crystallization Properties of a Polyhydroxyalkanoate Binary Copolymer Containing 3-Hydroxybutyrate and 3-Hydroxy-2-Methylvalerate Units2023

    • Author(s)
      Yuki Miyahara, Tomoya Nakamura, Maierwufu Mierzati, Zihan Qie, Tomoki Shibasaka, Christopher T. Nomura, Seiichi Taguchi, Hideki Abe, Takeharu Tsuge
    • Journal Title

      Processes

      Volume: 11 Issue: 7 Pages: 1901-1901

    • DOI

      10.3390/pr11071901

    • Related Report
      2023 Annual Research Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] Exploring Class I polyhydroxyalkanoate synthases with broad substrate specificity for polymerization of structurally diverse monomer units2023

    • Author(s)
      Sivashankari Ramamoorthi M、Mierzati Maierwufu、Miyahara Yuki、Mizuno Shoji、Nomura Christopher T.、Taguchi Seiichi、Abe Hideki、Tsuge Takeharu
    • Journal Title

      Frontiers in Bioengineering and Biotechnology

      Volume: 11 Pages: 1114946-1114946

    • DOI

      10.3389/fbioe.2023.1114946

    • Related Report
      2022 Annual Research Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] Thermal properties of poly(3-hydroxy-2-methylbutyrate-co-3-hydroxybutyrate) copolymers with narrow comonomer-unit compositional distributions2021

    • Author(s)
      Furutate Sho、Abe Hideki、Tsuge Takeharu
    • Journal Title

      Polymer Journal

      Volume: 53 Issue: 12 Pages: 1451-1457

    • DOI

      10.1038/s41428-021-00545-4

    • Related Report
      2021 Annual Research Report
    • Peer Reviewed
  • [Presentation] Identification of Novel PHA Synthases (PhaCs) with Broad Substrate Specificities2022

    • Author(s)
      R. Sivashankari, Y. Miyahara, Mizuno, T. Tsuge
    • Organizer
      The 5th International Union of Materials Research Societies International Conference of Young Researchers on Advanced Materials
    • Related Report
      2022 Annual Research Report
    • Int'l Joint Research

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

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