Opening of Holes in Liposomal Membranes Is Induced by Proteins Possessing the FERM Domain

Shuichi Takeda, Akihiko Saitoh, Mayumi Furuta, Nao Satomi, Atsushi Ishino, Gakushi Nishida, Hiroaki Sudo, Hirokazu Hotani, Kingo Takiguchi

Research output: Contribution to journalArticlepeer-review

22 Citations (Scopus)

Abstract

The destabilization of vesicles caused by interactions between lipid bilayers and proteins was studied by direct, real-time observation using high-intensity dark-field microscopy. We previously reported that talin, a cytoskeletal submembranous protein, can reversibly open stable large holes in giant liposomes made of neutral and acidic phospholipids. Talin and other proteins belonging to the band 4.1 superfamily have the FERM domain at their N-terminal and interact with lipid membranes via that domain. Here, we observed that band 4.1, ezrin and moesin, members of the band 4.1 superfamily, are also able to open stable holes in liposomes. However, truncation of their C-terminal domains, which can interact with the N-terminal FERM domain, impaired their hole opening activities. Oligomeric states of ezrin affected the capability of the membrane hole formation. Phosphatidylinositol bisphosphate (PIP2), which binds to the FERM domain and disrupts the interaction between the N and C termini of the band 4.1 superfamily, down-regulates their membrane opening activity. These results suggest that the intermolecular interaction plays a key role in the observed membrane hole formation.

Original languageEnglish
Pages (from-to)403-413
Number of pages11
JournalJournal of Molecular Biology
Volume362
Issue number3
DOIs
Publication statusPublished - Sep 22 2006
Externally publishedYes

Keywords

  • band 4.1 superfamily
  • giant liposome
  • membrane perturbation
  • membrane-protein interaction
  • optical microscopy

ASJC Scopus subject areas

  • Structural Biology
  • Molecular Biology

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