The structure and spontaneous curvature of clathrin lattices at the plasma membrane

Kem A. Sochacki, Bridgette L. Heine, Gideon J. Haber, John R. Jimah, Bijeta Prasai, Marco A. Alfonzo-Méndez, Aleah D. Roberts, Agila Somasundaram, Jenny E. Hinshaw, Justin W. Taraska

Research output: Contribution to journalArticlepeer-review

14 Scopus citations

Abstract

Clathrin-mediated endocytosis is the primary pathway for receptor and cargo internalization in eukaryotic cells. It is characterized by a polyhedral clathrin lattice that coats budding membranes. The mechanism and control of lattice assembly, curvature, and vesicle formation at the plasma membrane has been a matter of long-standing debate. Here, we use platinum replica and cryoelectron microscopy and tomography to present a structural framework of the pathway. We determine the shape and size parameters common to clathrin-mediated endocytosis. We show that clathrin sites maintain a constant surface area during curvature across multiple cell lines. Flat clathrin is present in all cells and spontaneously curves into coated pits without additional energy sources or recruited factors. Finally, we attribute curvature generation to loosely connected and pentagon-containing flat lattices that can rapidly curve when a flattening force is released. Together, these data present a universal mechanistic model of clathrin-mediated endocytosis.

Original languageEnglish (US)
Pages (from-to)1131-1146.e3
JournalDevelopmental cell
Volume56
Issue number8
DOIs
StatePublished - Apr 19 2021
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Molecular Biology
  • Biochemistry, Genetics and Molecular Biology(all)
  • Developmental Biology
  • Cell Biology

Keywords

  • clathrin
  • cryoelectron microscopy
  • endocytosis
  • plaques
  • platinum replica electron microscopy
  • tomography

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