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Nat Cell Biol. 2006 Mar;8(3):238-48. Epub 2006 Feb 19.

GM130 and GRASP65-dependent lateral cisternal fusion allows uniform Golgi-enzyme distribution.

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Department of Biological Sciences, Carnegie Mellon University, Pittsburgh, PA 15213, USA.


The mammalian Golgi apparatus exists as stacks of cisternae that are laterally linked to form a continuous membrane ribbon, but neither the molecular requirements for, nor the purpose of, Golgi ribbon formation are known. Here, we demonstrate that ribbon formation is mediated by specific membrane-fusion events that occur during Golgi assembly, and require the Golgi proteins GM130 and GRASP65. Furthermore, these GM130 and GRASP65-dependent lateral cisternal-fusion reactions are necessary to achieve uniform distribution of enzymes in the Golgi ribbon. The membrane continuity created by ribbon formation facilitates optimal processing conditions in the biosynthetic pathway.

[Indexed for MEDLINE]

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