Abstract
In the ciliated protozoan Tetrahymena thermophila specific intramembrane particle arrays, called the fusion rosettes, have been shown to mark the site within the cell membrane towards which the secretory organelles of this cell migrate and dock prior to membrane fusion and release of product. Similarly, an annulus of particles is formed at the anterior end of the secretory organelle when it is docked in place below the rosette (1, 2). A single rosette consists of a small ring of 11 (PF + EF) particles with a large center particle (15nm diameter) approximately twice the size of the other particles. The outer diameter of the small ring is 60nm. Earlier studies have shown that, during the fusion of the two partner membranes, the rosette particles do not remain together as a stable unit, but the individual particles of the rosette spread out and become dispersed among the other particles present in the cell membrane.
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