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Development of a novel directed evolution method to improve recombinant protein productivity in insect factories

Research Project

Project/Area Number 22K20581
Research Category

Grant-in-Aid for Research Activity Start-up

Allocation TypeMulti-year Fund
Review Section 0602:Agricultural and environmental biology and related fields
Research InstitutionKyushu University

Principal Investigator

Masuda Akitsu  九州大学, 農学研究院, 助教 (10967079)

Project Period (FY) 2022-08-31 – 2024-03-31
Project Status Completed (Fiscal Year 2023)
Budget Amount *help
¥2,860,000 (Direct Cost: ¥2,200,000、Indirect Cost: ¥660,000)
Fiscal Year 2023: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
Fiscal Year 2022: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
Keywordsカイコ / バキュロウイルス / 変異導入 / 組換えタンパク質 / 指向性進化 / タンパク質工学
Outline of Research at the Start

本研究は、強力な有用物質生産系であるカイコ-バキュロウイルス発現系のさらなる改良のため、昆虫体内で指向性進化を起こすことによって生産したいタンパク質を目的の機能を持つように改変できる手法の開発を目的とする。そのために、昆虫細胞内で特定のDNA領域内にランダムな変異を導入する技術の確立と、優良な変異体が効率的に選抜されるような技術を開発し、これらの技術を統合して、カイコで少量しか作れない難発現性の組換えタンパク質の指向性進化による生産性改善を目指す。

Outline of Final Research Achievements

In the silkworm-baculovirus expression system, which can efficiently produce recombinant proteins, it is known that there are some difficult-to-express proteins. Therefore, insect directed evolutionary tools that enable mutagenesis and selection of favourable mutants are needed to solve this problem. In this study, we attempted to develop a tool for introducing mutations into specific regions of the baculovirus genome and to identify baculovirus genes that affect viral proliferation, which is necessary for selecting desired mutants. The mutagenic enzyme was found to be expressed by the baculovirus in cultured insect cells, but no mutations in the target sequence were identified. In the identification of genes affecting viral proliferability, eight candidate genes were examined and several genes that could manipulate proliferability were identified.

Academic Significance and Societal Importance of the Research Achievements

高いタンパク質生産能力を持つカイコの発現系には、その工程の煩雑さからタンパク質の変異体の発現をスループット性高く検証するツールが存在しなかった。今回の知見を元に昆虫における独自の指向性進化ツールが実現できれば、他の発現系では作れないようなタンパク質でも機能改変や生産性改善が可能となり、バイオ医薬品やタンパク質材料の分野で大きく貢献できる可能性がある。

Report

(3 results)
  • 2023 Annual Research Report   Final Research Report ( PDF )
  • 2022 Research-status Report

URL: 

Published: 2022-09-01   Modified: 2025-01-30  

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