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J. Cell Biol., Volume 146, Number 1, July 12, 1999 57-70
Copyright © 1999 by The Rockefeller University Press.

A Role for the Vesicle Tethering Protein, p115, in the Post-mitotic Stacking of Reassembling Golgi Cisternae in a Cell-free System

James Shortera and Graham Warrena
a Cell Biology Laboratory, Imperial Cancer Research Fund, London WC2A 3PX, United Kingdom

Correspondence to: James Shorter, Cell Biology Laboratory, Imperial Cancer Research Fund, 44 Lincoln's Inn Fields, London WC2A 3PX, UK., shorter{at}icrf.icnet.uk (E-mail), 0171-269-3403 (phone), 0171-269-3417 (fax)

During telophase, Golgi cisternae are regenerated and stacked from a heterogeneous population of tubulovesicular clusters. A cell-free system that reconstructs these events has revealed that cisternal regrowth requires interplay between soluble factors and soluble N-ethylmaleimide (NEM)–sensitive fusion protein (NSF) attachment protein receptors (SNAREs) via two intersecting pathways controlled by the ATPases, p97 and NSF. Golgi reassembly stacking protein 65 (GRASP65), an NEM-sensitive membrane-bound component, is required for the stacking process. NSF-mediated cisternal regrowth requires a vesicle tethering protein, p115, which we now show operates through its two Golgi receptors, GM130 and giantin. p97-mediated cisternal regrowth is p115-independent, but we now demonstrate a role for p115, in conjunction with its receptors, in stacking p97 generated cisternae. Temporal analysis suggests that p115 plays a transient role in stacking that may be upstream of GRASP65-mediated stacking. These results implicate p115 and its receptors in the initial alignment and docking of single cisternae that may be an important prerequisite for stack formation.

Key Words: Golgi apparatus, mitosis, p115, tethering, stack


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