Abstract
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.
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Acknowledgements
We thank J. Suhan for the electron microscopy, T. Feinstein for the VSV-G–GFP cells and for assistance with GRASP65 knockdown, T. Lee for helpful discussions, J. White for the GalNAc-T2 cells, O. Weisz for the anti-VSV-G antibody, and V. Malhotra and G. Warren for the GRASP65 antibodies. Funding was provided by grants RSG-03-148-01-CSM and GM-56779-02 to A.D.L.
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Puthenveedu, M., Bachert, C., Puri, S. et al. GM130 and GRASP65-dependent lateral cisternal fusion allows uniform Golgi-enzyme distribution. Nat Cell Biol 8, 238–248 (2006). https://doi.org/10.1038/ncb1366
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DOI: https://doi.org/10.1038/ncb1366
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