Journal of Plant Biotechnology

The Korean Society of Plant Biotechnology (한국식물생명공학회)
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Effect of 42 amino acid long amyloid-β peptides on Arabidopsis plants

  • Lee, HanGyeol (Division of Life Sciences, Jeonbuk National University) ;
  • Kim, Ji Woo (Division of Life Sciences, Jeonbuk National University) ;
  • Jeong, Sangyun (Division of Life Sciences, Jeonbuk National University) ;
  • An, Jungeun (Division of Life Sciences, Jeonbuk National University) ;
  • Kim, Young-Cheon (Division of Life Sciences, Jeonbuk National University) ;
  • Ryu, Hojin (Department of Biology, Chungbuk National University) ;
  • Lee, Jeong Hwan (Division of Life Sciences, Jeonbuk National University)
  • Received : 2020.10.21
  • Accepted : 2020.11.04
  • Published : 2020.12.31
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Abstract

Although the evolution of Arabidopsis thaliana and humans diverged approximately 1.6 billion years ago, recent studies have demonstrated that protein function and cellular processes involved in disease response remain remarkably conserved. Particularly, γ-secretase, a multisubunit protein complex that participates in intramembrane proteolysis (RIP) regulation, is also known to mediate the cleavage of more than 80 substrates including the amyloid precursor protein (APP) and the Notch receptor. Although the genes (PS1/2, APH-1, PEN-2, and NCT) coding for the γ-secretase complex components are present in plant genomes, their function remains largely uncharacterized. Given that the deposition of 42 amino acid long amyloid-β peptides (hAβ42) is thought to be one of the main causes of Alzheimer's disease, we aimed to examine the physiological effects of hAβ42 peptides on plants. Interestingly, we found that Arabidopsis protoplast death increased after 24 h of exposure to 3 or 5 µM hAβ42 peptides. Furthermore, transgenic Arabidopsis plants overexpressing the hAβ42 gene exhibited changes in primary root length and silique phyllotaxy. Taken together, our results demonstrate that hAβ42 peptides, a metazoan protein, significantly affect Arabidopsis protoplast viability and plant morphology.

Keywords

Acknowledgement

We thank Dr. Mook-Jung (Seoul National University) for kindly providing research methods. This work was supported by National University Promotion Program in 2019 (to J.H. Lee).

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