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Neuroendocrine Synaptic Vesicles Are Formed In Vitro by Both Clathrin-dependent and Clathrin-independent Pathways
| Content Provider | Semantic Scholar |
|---|---|
| Author | Shi, Gongyi Faundez, Victor Roos, Jack Dell'angelica, Esteban C. |
| Copyright Year | 1998 |
| Abstract | In the neuroendocrine cell line, PC12, synaptic vesicles can be generated from endosomes by a sorting and vesiculation process that requires the heterotetrameric adaptor protein AP3 and a small molecular weight GTPase of the ADP ribosylation factor (ARF) family. We have now discovered a second pathway that sorts the synaptic vesicle-associated membrane protein (VAMP) into similarly sized vesicles. For this pathway the plasma membrane is the precursor rather than endosomes. Both pathways require cytosol and ATP and are inhibited by GTPgammaS. The second pathway, however, uses AP2 instead of AP3 and is brefeldin A insensitive. The AP2-dependent pathway is inhibited by depletion of clathrin or by inhibitors of clathrin binding, whereas the AP3 pathway is not. The VAMP-containing, plasma membrane-derived vesicles can be readily separated on sucrose gradients from transferrin (Tf)-containing vesicles generated by incubating Tf-labeled plasma membrane preparations at 37 degreesC. Dynamin- interacting proteins are required for the AP2-mediated vesiculation from the plasma membrane, but not from endosomes. Thus, VAMP is sorted into small vesicles by AP3 and ARF1 at endosomes and by AP2 and clathrin at the plasma membrane. |
| Starting Page | 947 |
| Ending Page | 955 |
| Page Count | 9 |
| File Format | PDF HTM / HTML |
| PubMed reference number | 9817753v1 |
| Volume Number | 143 |
| Journal | The Journal of cell biology |
| Alternate Webpage(s) | http://jcb.rupress.org/content/143/4/947.full.pdf |
| Alternate Webpage(s) | http://jcb.rupress.org/content/jcb/143/4/947.full.pdf |
| Language | English |
| Access Restriction | Open |
| Subject Keyword | ADP-Ribosylation Factors Adaptor Proteins, Signal Transducing Adenosine Diphosphate Adenosine Triphosphate Clathrin Cytoplasmic matrix Endosomes Guanosine Triphosphate Phosphohydrolases Membrane Proteins Molecular Weight Neuroendocrine Cells Neurosecretory Systems Plasma membrane Sucrose Synaptic Vesicles Tracer VAMP regimen (vincristine, doxorubicin, methotrexate and prednisone) Vesicle (morphologic abnormality) incubated |
| Content Type | Text |
| Resource Type | Article |
