Competing pathways for the invagination of clathrin-coated membranes
Clathrin-mediated endocytosis is the major pathway by which eukaryotic cells take up extracellular material, but it is still elusive which physical pathways are being taken during membrane invagination. From a continuum point of view, it can be driven by increases in coat stiffness, preferred curvat...
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| Main Authors: | , |
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| Format: | Article (Journal) |
| Language: | English |
| Published: |
20th October 2020
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| In: |
Soft matter
Year: 2020, Volume: 16, Issue: 47, Pages: 10723-10733 |
| ISSN: | 1744-6848 |
| DOI: | 10.1039/D0SM01375G |
| Online Access: | Verlag, lizenzpflichtig, Volltext: https://doi.org/10.1039/D0SM01375G Verlag, lizenzpflichtig, Volltext: https://pubs.rsc.org/en/content/articlelanding/2020/sm/d0sm01375g 
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| Author Notes: | Felix Frey and Ulrich S. Schwarz |
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| 520 | |a Clathrin-mediated endocytosis is the major pathway by which eukaryotic cells take up extracellular material, but it is still elusive which physical pathways are being taken during membrane invagination. From a continuum point of view, it can be driven by increases in coat stiffness, preferred curvature or line tension. Here we develop a comprehensive theoretical framework that can be solved analytically and that predicts the consequences of these different scenarios. We find that for the case of increasing stiffness or preferred curvature, curvature will be acquired gradually with growth, while for increasing line tension, the lattice must have grown to a certain size before a flat-to-curved transition can occur. At low membrane tension, the critical value for coat stiffness is 30 kBT, for preferred curvature it is 200 nm, and for line tension it is 6 pN. For high membrane tension, critical coat stiffness is 150 kBT and critical preferred curvature is 70 nm. In the mixed case when a coat with finite rigidity but increasing line tension is considered, a cup-to-sphere transition can occur for a line tension of 6 pN. The flat-to-curved and the cup-to-sphere transitions driven by line tension are both suppressed by high membrane tension. | ||
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