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| Content Provider | World Health Organization (WHO)-Global Index Medicus |
|---|---|
| Author | Govindan, B. Bowser, R. Novick, P. |
| Description | Author Affiliation: Govindan B ( Department of Cell Biology, Yale University School of Medicine, New Haven, Connecticut 06520-8002.) |
| Abstract | Previous studies have shown that temperature-sensitive, myo2-66 yeast arrest as large, unbudded cells that accumulate vesicles within their cytoplasm (Johnston, G. C., J. A. Prendergast, and R. A. Singer. 1991. J. Cell Biol. 113:539-551). In this study we show that myo2-66 is synthetically lethal in combination with a subset of the late-acting sec mutations. Thin section electron microscopy shows that the post- Golgi blocked secretory mutants, sec1-1 and sec6-4, rapidly accumulate vesicles in the bud, upon brief incubations at the restrictive temperature. In contrast, myo2-66 cells accumulate vesicles predominantly in the mother cell. Double mutant analysis also places Myo2 function in a post-Golgi stage of the secretory pathway. Despite the accumulation of vesicles in myo2-66 cells, pulse-chase studies show that the transit times of several secreted proteins, including invertase and alpha factor, as well as the vacuolar proteins, carboxy- peptidase Y and alkaline phosphatase, are normal. Therefore the vesicles which accumulate in this mutant may function on an exocytic pathway that transports a set of cargo proteins that is distinct from those analyzed. Our observations are consistent with a role for Myo2 in transporting a class of secretory vesicles from the mother cell along actin cables into the bud. |
| ISSN | 00219525 |
| e-ISSN | 15408140 |
| Journal | The Journal of Cell Biology |
| Issue Number | 6 |
| Volume Number | 128 |
| Language | English |
| Publisher | Rockefeller University Press (United States) |
| Publisher Date | 1995-03-01 |
| Publisher Place | United States |
| Access Restriction | Open |
| Subject Keyword | Carrier Proteins Metabolism Cytoplasmic Granules Fungal Proteins Myosin Heavy Chains Myosin Type II Myosin Type V Saccharomyces Cerevisiae Proteins Saccharomyces Cerevisiae Schizosaccharomyces Pombe Proteins Biological Transport Genetics Ultrastructure Microscopy, Electron Mutation 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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