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Structure of the flotillin complex in a native membrane environment.
Ziao Fu1,2, Roderick MacKinnon1,2
1Laboratory of Molecular Neurobiology and Biophysics, The Rockefeller University, New York, NY 10065.
Summary
Researchers determined the cryo-electron microscopy structure of the Flotillin protein complex, revealing a helical barrel crucial for membrane interactions and cellular processes like endocytosis.
Area of Science:
- Structural Biology
- Cell Biology
- Biochemistry
Background:
- Flotillin proteins are part of the Stomatin, Prohibitin, Flotillin, and HflK/C (SPFH) superfamily.
- These proteins are implicated in various cellular functions, including membrane trafficking and endocytosis.
Purpose of the Study:
- To elucidate the high-resolution structure of the Flotillin protein complex.
- To understand the molecular mechanisms underlying Flotillin's membrane interaction and oligomerization.
Main Methods:
- Cryoelectron microscopy (cryo-EM) was employed to determine the structure.
- Analysis of cell-derived vesicles without detergent solubilization.
Main Results:
- The Flotillin complex forms a right-handed helical barrel composed of Flotillin1 and Flotillin2 subunits.
- The structure reveals specific domains (SPFH1, C-terminus, coiled-coil) involved in oligomerization, membrane interaction, and potential membrane curvature induction.
- Interactions with membranes occur at both ends of the complex, mediated by hydrophobic interactions and lipidation.
Conclusions:
- The determined structure provides insights into the architecture of SPFH superfamily proteins.
- The findings suggest a role for Flotillin in membrane curvature and clathrin-independent endocytosis.
- This structural information will facilitate further investigations into Flotillin's biological functions.
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