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© The Rockefeller University Press, 0021-9525/2000//45 $5.00
The Journal of Cell Biology, Volume 148, Number 1, , 2000 45-58

Original Article

Correlative Light-Electron Microscopy Reveals the Tubular-Saccular Ultrastructure of Carriers Operating between Golgi Apparatus and Plasma Membrane



Roman S. Polishchuka, Elena V. Polishchuka, Pierfrancesco Marraa, Saverio Albertia, Roberto Buccionea, Alberto Luinia, and Alexander A. Mironova

a Department of Cell Biology and Oncology, Istituto di Ricerche Farmacologiche "Mario Negri," Consorzio Mario Negri Sud, 66030 S. Maria Imbaro (Chieti), Italy
Department of Cell Biology and Oncology, Consorzio Mario Negri Sud, Via Nazionale, 66030 S. Maria Imbaro (Chieti), Italy.39-0872-57041239-0872-570-355

mironov{at}cmns.mnegri.it

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 µm 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.

Key Words: Golgi complex • anterograde intracellular transport • membrane traffic • immunoelectron microscopy • plasmalemma

© 2000 The Rockefeller University Press

R.S. Polishchuk and E.V. Polishchuk contributed equally to this paper.

Abbreviations used in this paper: 3D, three-dimensional; GFP, green fluorescent protein; GPC, Golgi-to-PM carrier; MT, microtubule; PM, plasma membrane; TI, transport intermediate; VSVG, vesicular stomatitis virus G protein; WGA, wheat germ agglutinin.


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