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  • 1. Hoernke, Maria
    et al.
    Larsson, Elin
    Umeå University, Faculty of Medicine, Department of Medical Biochemistry and Biophysics.
    Mohan, Jagan
    Umeå University, Faculty of Medicine, Department of Medical Biochemistry and Biophysics.
    Blomberg, Jeanette
    Umeå University, Faculty of Medicine, Department of Medical Biochemistry and Biophysics.
    Westenhoff, Sebastian
    Lundmark, Richard
    Umeå University, Faculty of Medicine, Department of Medical Biochemistry and Biophysics.
    Schwieger, Christian
    Structural Mechanism in a Membrane Remodelling ATP-ASE2016In: Biophysical Journal, ISSN 0006-3495, E-ISSN 1542-0086, Vol. 110, no 3, p. 578A-578AArticle in journal (Other academic)
  • 2. Hoernke, Maria
    et al.
    Mohan, Jagan
    Umeå University, Faculty of Medicine, Department of Integrative Medical Biology (IMB).
    Larsson, Elin
    Umeå University, Faculty of Medicine, Molecular Infection Medicine Sweden (MIMS).
    Blomberg, Jeanette
    Umeå University, Faculty of Medicine, Molecular Infection Medicine Sweden (MIMS).
    Kahra, Dana
    Umeå University, Faculty of Medicine, Molecular Infection Medicine Sweden (MIMS).
    Westenhoff, Sebastian
    Schwieger, Christian
    Lundmark, Richard
    Umeå University, Faculty of Medicine, Department of Integrative Medical Biology (IMB). Umeå University, Faculty of Medicine, Molecular Infection Medicine Sweden (MIMS).
    EHD2 restrains dynamics of caveolae by an ATP-dependent, membrane-bound, open conformation2017In: Proceedings of the National Academy of Sciences of the United States of America, ISSN 0027-8424, E-ISSN 1091-6490, Vol. 114, no 22, p. E4360-E4369Article in journal (Refereed)
    Abstract [en]

    The EH-domain-containing protein 2 (EHD2) is a dynamin-related ATPase that confines caveolae to the cell surface by restricting the scission and subsequent endocytosis of these membrane pits. For this, EHD2 is thought to first bind to the membrane, then to oligomerize, and finally to detach, in a stringently regulated mechanistic cycle. It is still unclear how ATP is used in this process and whether membrane binding is coupled to conformational changes in the protein. Here, we show that the regulatory N-terminal residues and the EH domain keep the EHD2 dimer in an autoinhibited conformation in solution. By significantly advancing the use of infrared reflection-absorption spectroscopy, we demonstrate that EHD2 adopts an open conformation by tilting the helical domains upon membrane binding. We show that ATP binding enables partial insertion of EHD2 into the membrane, where G-domain-mediated oligomerization occurs. ATP hydrolysis is related to detachment of EHD2 from the membrane. Finally, we demonstrate that the regulation of EHD2 oligomerization in a membrane-bound state is crucial to restrict caveolae dynamics in cells.

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