The Physiological Functions of a Model Peptide of G3LEA in Living Cells

• TOKUMOTO Shoko

• BANNO Misa

• MIYATA Yugo

• SAKURAI Minoru

• KIKAWADA Takahiro

Abstract

Group 3 late embryogenesis abundant (G3LEA) proteins have a protective function against desiccation stress. In our previous work, the model peptide, PvLEA-22, was developed based on one tandem repeat of the conserved 11-mer motif in G3LEA proteins. PvLEA-22 peptide showed an anti-aggregation activity for dried liposomes and other proteins in vitro, leading to the hypothesis that PvLEA-22 peptide could suppress aggregation of proteins and membrane structures in vivo and raise the survival rate after rehydration. To address whether PvLEA-22 peptide could mimic the function of G3LEA in vivo, we used the Pv11 cell line established from an anhydrobiotic chironomid, Polypedilum vanderplanki, investigated the beneficial effect of either extracellular or intracellular occurrence of PvLEA-22 peptide on the survival rate of the dried Pv11 cells after rehydration. Consequently, both experiments did not show any beneficial effect of PvLEA-22 peptide on the survival rate. Interestingly, the treatment of high concentration PvLEA- 22 peptide caused the cell death. It should be due to strong binding activity of the peptide to cell membrane, resulting in loss of membrane flexibility. Our results demonstrated that PvLEA-22 peptide did not have the same function as G3LEA proteins in Pv11 cells and treatment of high-concentration PvLEA-22 peptide spoiled desiccation tolerance instead.

Journal

• Cryobiology and Cryotechnology

  Cryobiology and Cryotechnology 64 (2), 67-73, 2019

  Japanese Society of Cryobiology and Cryotechnology

Details

• CRID: 1390282763095668096
• NII Article ID: 130007601563
• DOI: 10.20585/cryobolcryotechnol.64.2_67
• ISSN: 24241555
• ISSN: 13407902
• Text Lang: en
• Data Source:
  • JaLC
  • CiNii Articles
• Abstract License Flag: Disallowed