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| Content Provider | World Health Organization (WHO)-Global Index Medicus |
|---|---|
| Author | Merz, Alexey J. Collins, Kevin M. Wang, Li Wickner, William |
| Description | Author Affiliation: Wang L ( Department of Biochemistry, Dartmouth Medical School, Hanover, NH 03755, USA.) |
| Abstract | Vacuole tethering, docking, and fusion proteins assemble into a “vertex ring” around the apposed membranes of tethered vacuoles before catalyzing fusion. Inhibitors of the fusion reaction selectively interrupt protein assembly into the vertex ring, establishing a causal assembly hierarchy: (a) The Rab GTPase Ypt7p mediates vacuole tethering and forms the initial vertex ring, independent of t-SNAREs or actin; (b) F-actin disassembly and GTP-bound Ypt7p direct the localization of other fusion factors; (c) The t-SNAREs Vam3p and Vam7p regulate each other's vertex enrichment, but do not affect Ypt7p localization. The v-SNARE Vti1p is enriched at vertices by a distinct pathway that is independent of the t-SNAREs, whereas both t-SNAREs will localize to vertices when trans-pairing of SNAREs is blocked. Thus, trans-SNARE pairing is not required for SNARE vertex enrichment; and (d) The t-SNAREs regulate the vertex enrichment of both G-actin and the Ypt7p effector complex for homotypic fusion and vacuole protein sorting (HOPS). In accord with this hierarchy concept, the HOPS complex, at the end of the vertex assembly hierarchy, is most enriched at those vertices with abundant Ypt7p, which is at the start of the hierarchy. Our findings provide a unique view of the functional relationships between GTPases, SNAREs, and actin in membrane fusion. |
| ISSN | 00219525 |
| e-ISSN | 15408140 |
| Journal | The Journal of Cell Biology |
| Issue Number | 3 |
| Volume Number | 160 |
| Language | English |
| Publisher | Rockefeller University Press (United States) |
| Publisher Date | 2003-02-03 |
| Publisher Place | United States |
| Access Restriction | Open |
| Subject Keyword | Actins Metabolism GTP Phosphohydrolases Intracellular Membranes Membrane Fusion Physiology Membrane Proteins Vacuoles Vesicular Transport Proteins Yeasts Carrier Proteins Cells, Cultured Ultrastructure Macromolecular Substances Nerve Tissue Proteins Protein Structure, Tertiary Protein Transport Qa-SNARE Proteins Qb-SNARE Proteins SNARE Proteins Saccharomyces Cerevisiae Proteins Synaptosomal-Associated Protein 25 Cytology Rab GTP-Binding Proteins Research Support, Non-U.S. Gov't Research Support, U.S. Gov't, P.H.S. Cell Biology |
| Content Type | Text |
| Resource Type | Article |
| Subject | Cell Biology Medicine |
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