Cargo and dynamin regulate clathrin-coated pit maturation.

Abstract:

:Total internal reflection fluorescence microscopy (TIR-FM) has become a powerful tool for studying clathrin-mediated endocytosis. However, due to difficulties in tracking and quantifying their heterogeneous dynamic behavior, detailed analyses have been restricted to a limited number of selected clathrin-coated pits (CCPs). To identify intermediates in the formation of clathrin-coated vesicles and factors that regulate progression through these stages, we used particle-tracking software and statistical methods to establish an unbiased and complete inventory of all visible CCP trajectories. We identified three dynamically distinct CCP subpopulations: two short-lived subpopulations corresponding to aborted intermediates, and one longer-lived productive subpopulation. In a manner dependent on AP2 adaptor complexes, increasing cargo concentration significantly enhances the maturation efficiency of productive CCPs, but has only minor effects on their lifetimes. In contrast, small interfering RNA (siRNA) depletion of dynamin-2 GTPase and reintroduction of wild-type or mutant dynamin-1 revealed dynamin's role in controlling the turnover of abortive intermediates and the rate of CCP maturation. From these data, we infer the existence of an endocytic restriction or checkpoint, responsive to cargo and regulated by dynamin.

journal_name

PLoS Biol

journal_title

PLoS biology

authors

Loerke D,Mettlen M,Yarar D,Jaqaman K,Jaqaman H,Danuser G,Schmid SL

doi

10.1371/journal.pbio.1000057

subject

Has Abstract

pub_date

2009-03-17 00:00:00

pages

e57

issue

3

eissn

1544-9173

issn

1545-7885

pii

08-PLBI-RA-3646

journal_volume

7

pub_type

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