Abstract
Proteins inserted into the cell surface by exocytosis are thought to be retrieved by compensatory endocytosis, suggesting that retrieval requires granule proteins. In sea urchin eggs, calcium influx through P-type calcium channels is required for retrieval, and the large size of sea urchin secretory granules permits the direct observation of retrieval. Here we demonstrate that retrieval is limited to sites of prior exocytosis. We tested whether channel distribution can account for the localization of retrieval at exocytotic sites. We find that P-channels reside on secretory granules before fertilization, and are translocated to the egg surface by exocytosis. Our study provides strong evidence that the transitory insertion of P-type calcium channels in the surface membrane plays an obligatory role in the mechanism coupling exocytosis and compensatory endocytosis.
Original language | English (US) |
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Pages (from-to) | 755-767 |
Number of pages | 13 |
Journal | Journal of Cell Biology |
Volume | 148 |
Issue number | 4 |
DOIs | |
State | Published - Feb 21 2000 |
Keywords
- Agatoxin
- Conotoxin
- Microscopy
- P-type calcium channels
- Sea urchins
ASJC Scopus subject areas
- Cell Biology