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- Title
A conformational switch in clathrin light chain regulates lattice structure and endocytosis at the plasma membrane of mammalian cells.
- Authors
Obashi, Kazuki; Sochacki, Kem A.; Strub, Marie-Paule; Taraska, Justin W.
- Abstract
Conformational changes in endocytic proteins are regulators of clathrin-mediated endocytosis. Three clathrin heavy chains associated with clathrin light chains (CLC) assemble into triskelia that link into a geometric lattice that curves to drive endocytosis. Structural changes in CLC have been shown to regulate triskelia assembly in solution, yet the nature of these changes, and their effects on lattice growth, curvature, and endocytosis in cells are unknown. Here, we develop a new correlative fluorescence resonance energy transfer (FRET) and platinum replica electron microscopy method, named FRET-CLEM. With FRET-CLEM, we measure conformational changes in clathrin at thousands of individual morphologically distinct clathrin-coated structures. We discover that the N-terminus of CLC repositions away from the plasma membrane and triskelia vertex as coats curve. Preventing this conformational switch with chemical tools increases lattice sizes and inhibits endocytosis. Thus, a specific conformational switch in the light chain regulates lattice curvature and endocytosis in mammalian cells. Conformational changes within proteins are thought to regulate clathrin-mediated endocytosis. Here, authors develop a correlative FRET and EM imaging method and uncover a structural switch in clathrin light chain that controls endocytosis in cells.
- Subjects
COATED vesicles; ENDOCYTOSIS; CELL membranes; CLATHRIN; FLUORESCENCE resonance energy transfer
- Publication
Nature Communications, 2023, Vol 14, Issue 1, p1
- ISSN
2041-1723
- Publication type
Article
- DOI
10.1038/s41467-023-36304-7