| Autor: |
Itin, C, Rancaño, C, Nakajima, Y, Pfeffer, S R |
| Zdroj: |
Journal of Biological Chemistry; October 1997, Vol. 272 Issue: 44 p27737-44, 8p |
| Abstrakt: |
Soluble N-ethylmaleimide-sensitive fusion protein (NSF) attachment protein (alpha-SNAP) is a soluble protein that enables the NSF ATPase to associate with membranes and facilitate membrane trafficking events. Although NSF and alpha-SNAP have been shown to be required for many membrane transport processes, their role in the transport of mannose 6-phosphate receptors from endosomes to the trans Golgi network was not established. We present here a novel in vitro assay that monitors the transport of cation-dependent mannose 6-phosphate receptors between endosomes and the trans Golgi network. The assay relies on the trans Golgi network localization of tyrosine sulfotransferase and monitors transport of mannose 6-phosphate receptors engineered to contain a consensus sequence for modification by this enzyme. Using this new assay we show that alpha-SNAP strongly stimulates transport in reactions containing limiting amounts of cytosol. Together with alpha-SNAP, NSF can increase the extent of transport. These data show that alpha-SNAP, a soluble component of the SNAP receptor machinery, facilitates transport from endosomes to the trans Golgi network. |
| Databáze: |
Supplemental Index |
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