Single-molecule turnover dynamics of actin and membrane coat proteins in clathrin-mediated endocytosis.

Abstract:

:Actin dynamics generate forces to deform the membrane and overcome the cell's high turgor pressure during clathrin-mediated endocytosis (CME) in yeast, but precise molecular details are still unresolved. Our previous models predicted that actin filaments of the endocytic meshwork continually polymerize and disassemble, turning over multiple times during an endocytic event, similar to other actin systems. We applied single-molecule speckle tracking in live fission yeast to directly measure molecular turnover within CME sites for the first time. In contrast with the overall ~20 s lifetimes of actin and actin-associated proteins in endocytic patches, we detected single-molecule residence times around 1 to 2 s, and similarly high turnover rates of membrane-associated proteins in CME. Furthermore, we find heterogeneous behaviors in many proteins' motions. These results indicate that endocytic proteins turn over up to five times during the formation of an endocytic vesicle, and suggest revising quantitative models of force production.

journal_name

Elife

journal_title

eLife

authors

Lacy MM,Baddeley D,Berro J

doi

10.7554/eLife.52355

subject

Has Abstract

pub_date

2019-12-19 00:00:00

issn

2050-084X

pii

52355

journal_volume

8

pub_type

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