The regulation mechanisms of peroxisomal protein import and homeostasis.
Project/Area Number |
19K06567
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Research Category |
Grant-in-Aid for Scientific Research (C)
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Allocation Type | Multi-year Fund |
Section | 一般 |
Review Section |
Basic Section 43030:Functional biochemistry-related
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Research Institution | Kyushu University |
Principal Investigator |
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Co-Investigator(Kenkyū-buntansha) |
藤木 幸夫 株式会社レオロジー機能食品研究所, 未登録, 九州大学名誉教授、顧問研究員、九州大学-レオロジー機能食品研究所 共同研究代表 (70261237)
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Project Period (FY) |
2019-04-01 – 2022-03-31
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Project Status |
Completed (Fiscal Year 2021)
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Budget Amount *help |
¥4,290,000 (Direct Cost: ¥3,300,000、Indirect Cost: ¥990,000)
Fiscal Year 2021: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
Fiscal Year 2020: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
Fiscal Year 2019: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
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Keywords | ペルオキシソーム / リン酸化 / 酸化ストレス応答 / 細胞周期 / PEX遺伝子 / 膜透過輸送 / リン酸化修飾 |
Outline of Research at the Start |
本課題研究は細胞内小器官ペルオキシソームをモデルオルガネラとし、膜を介したタンパク質輸送とその機能制御システムを分子レベルで明らかにすることでペルオキシソーム恒常性維持の分子メカニズム解明へ発展させる。とくに、ペルオキシソーム形成において中心的な役割を果たす膜透過輸送装置の複合体構造とその複合体が担うタンパク質輸送機序の解明、さらには細胞内外からのシグナルに応答したペルオキシソーム機能制御システムを明らかにするという切り口から、ペルオキシソーム恒常性維持の分子メカニズム解明に向けた研究を展開する。
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Outline of Final Research Achievements |
One central component of peroxisomal matrix protein import machinery is Pex14p, a peroxisomal membrane protein involved in the docking of Pex5p, the receptor for peroxisome targeting signal type 1. Studies in several yeast species have shown that Pex14p is phosphorylated in vivo, whereas no function has been assigned to Pex14p phosphorylation in yeast and mammalian cells. We investigated peroxisomal protein import and its dynamics in mitotic mammalian cells. In mitotically arrested cells, Pex14p is phosphorylated at Ser232, resulting in a lower import efficiency of catalase. Conformational change induced by the mitotic phosphorylation of Pex14p suppresses topological change of its N-terminal part, thereby giving rise to the retardation of Pex5p export in mitotic cells. Mitotic phosphorylation of Pex14p and consequent suppression of catalase import are a mechanism of protecting DNA upon nuclear envelope breakdown at mitosis.
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Academic Significance and Societal Importance of the Research Achievements |
本研究の成果により、細胞内の環境変化に応答したペルオキシソーム機能の制御メカニズム解明に向けた手がかりを得ることができ、さらには細胞のストレス毒性に対するペルオキシソームの抗ストレス機能の解明に繋がるだけでなく、活性酸素種が関与する病気や老化の進行等に対する今後の治療法開発や創薬研究への展開が大きく期待される。
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Report
(4 results)
Research Products
(17 results)
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[Journal Article] Mitotic phosphorylation of Pex14p regulates peroxisomal import machinery.2020
Author(s)
Yamashita, K., Tamura, S., Honsho, M., Yada, H., Yagita, Y., Kosako, H., and Fujiki, Y.
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Journal Title
J. Cell Biol.
Volume: 219
Issue: 10
DOI
NAID
Related Report
Peer Reviewed
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[Journal Article] Recent insights into peroxisome biogenesis and associated diseases2020
Author(s)
*Fujiki, Y., Abe, Y., Imoto, Y., Tanaka, A.J., Okumoto, K., Honsho, M., Tamura, S., Miyata, N., Yamashita, T., Chung, W.K., and Kuroiwa, T.
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Journal Title
J. Cell Sci.
Volume: 133
Issue: 9
Pages: 236943-236943
DOI
Related Report
Peer Reviewed / Open Access / Int'l Joint Research
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[Journal Article] Peroxisome deficiency impairs BDNF signaling and memory.2020
Author(s)
Abe, Y., Nishimura, Y., Nakamura, K., Tamura, S., Honsho, M., Udo, H., Yamashita, T., and Fujiki, Y.
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Journal Title
Front. Cell Dev. Biol.
Volume: 8
Pages: 567017-567017
DOI
Related Report
Peer Reviewed / Open Access
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[Journal Article] A newly identified mutation in the PEX26 gene is associated with a milder form of Zellweger spectrum disorder.2019
Author(s)
Tanaka, A. J., Okumoto, K., Tamura, S., Abe, Y., Hirsch, Y., Deng, L., Ekstein, J., Chung, W. K., and Fujiki Y.
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Journal Title
Cold Spring Harb. Mol. Case Stud.
Volume: 5
Issue: 1
Pages: 1-16
DOI
Related Report
Peer Reviewed / Open Access / Int'l Joint Research
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[Presentation] Phosphorylation of Pex14p regulates peroxisomal protein import.2020
Author(s)
Yasumitsu, T., Yamashita, K., Tamura, S., Honsho, M., Okumoto, K., Yada, H., Yagita, Y., Kosako, H., and Fujiki, Y.
Organizer
Open European Peroxisome Meeting
Related Report
Int'l Joint Research
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