Journal
JOURNAL OF CELL BIOLOGY
Volume 148, Issue 1, Pages 45-58Publisher
ROCKEFELLER UNIV PRESS
DOI: 10.1083/jcb.148.1.45
Keywords
Golgi complex; anterograde intracellular transport; membrane traffic; immunoelectron microscopy; plasmalemma
Categories
Funding
- Telethon [E.0982, E.1105] Funding Source: Medline
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Transport intermediates (TIs) have a central role in intracellular traffic, and much effort has been directed towards defining their molecular organization, Unfortunately, major uncertainties remain regarding their true structure in living cells. To address this question, we have developed an approach based on the combination of the green fluorescent protein technology and correlative light-electron microscopy, by which it is possible to monitor an individual carrier in vivo and then take a picture of its ultrastructure at any moment of its lifecycle. We have applied this technique to define the structure of TIs operating from the Golgi apparatus to the plasma membrane, whose in vivo dynamics have been characterized recently by light microscopy, We find that these carriers are large (ranging from 0.3-1.7 mu m in maximum diameter, nearly half the size of a Golgi cisterna), comprise almost exclusively tubular-saccular structures, and fuse directly with the plasma membrane, sometimes minutes after docking to the fusion site.
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