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

TitleThe structure and spontaneous curvature of clathrin lattices at the plasma membrane.
Publication TypeJournal Article
Year of Publication2021
AuthorsSochacki, KA, Heine, BL, Haber, GJ, Jimah, JR, Prasai, B, Alfonzo-Méndez, MA, Roberts, AD, Somasundaram, A, Hinshaw, JE, Taraska, JW
JournalDev Cell
Volume56
Issue8
Pagination1131-1146.e3
Date Published2021/04/19
ISSN1878-1551
KeywordsAdhesiveness, Animals, Cell Line, Cell Membrane, Cholesterol, Clathrin, Cryoelectron Microscopy, Humans, Male, Mice, Models, Biological, Rats
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.

DOI10.1016/j.devcel.2021.03.017
Alternate JournalDev Cell
PubMed ID33823128
PubMed Central IDPMC8081270
Grant ListZIA DK060107 / ImNIH / Intramural NIH HHS / United States
ZIA HL006098 / ImNIH / Intramural NIH HHS / United States