Inhibition of endocytic vesicle fusion in vitro by the cell-cycle control protein kinase cdc2 - PubMed (original) (raw)
. 1989 Dec;342(6252):942-5.
doi: 10.1038/342942a0.
Affiliations
- PMID: 2556645
- DOI: 10.1038/342942a0
Inhibition of endocytic vesicle fusion in vitro by the cell-cycle control protein kinase cdc2
T Tuomikoski et al. Nature. 1989 Dec.
Abstract
Membrane transport between the endoplasmic reticulum and the plasma membrane, which involves the budding and fusion of carrier vesicles, is inhibited during mitosis in animal cells. At the same time, the Golgi complex and the nuclear envelope, as well as the endoplasmic reticulum in some cell types, become fragmented. Fragmentation of the Golgi is believed to facilitate its equal partitioning between daughter cells. In fact, it has been postulated that both the inhibition of membrane traffic and Golgi fragmentation during mitosis are due to an inhibition of vesicle fusion, while vesicle budding continues. Although less is known about the endocytic pathway, internalization and receptor recycling are also arrested during mitosis. We have now used a cell-free assay to show that the fusion of endocytic vesicles from baby hamster kidney cells is reduced in Xenopus mitotic cytosol when compared with interphase cytosol. We reconstituted this inhibition in interphase cytosol by adding a preparation enriched in the starfish homologue of the cdc2 protein kinase. Inhibition was greater than or equal to 90% when the added cdc2 activity was in the range estimated for that in mitotic Xenopus eggs, which indicates that during mitosis the cdc2 kinase mediates an inhibition of endocytic vesicle fusion, and possibly other fusion events in membrane traffic.
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