PMID: 6411744May 1, 1983Paper

Mapping of highly ordered membrane domains in the plasma membrane of the ciliate Cyclidium glaucoma

Journal of Cell Science
C F Bardele

Abstract

The entire cortex of Cyclidium glaucoma has been analysed in a correlated freeze-fracturing and ultrathin-sectioning study. Three types of highly ordered domains of intramembranous particles were found in the plasma membrane; owing to the many landmarks in the cortex of C. glaucoma it was possible to map their location in relation to the precisely known position of every single cilium. Eight particle plates made of parallel tripartite particle ridges have been found in precisely determined locations at the anterior pole of the cell and in the buccal cavity. It is suggested that these membrane specializations represent mechanosensitive sites. An array of three parallel rows of particles, termed a 'simple pellicular rug', forms a second type of membrane domain, which is closely associated with somatic dikinetids found exclusively in the anterior half of the cell. A third extremely complex array, termed a 'complex pellicular rug', is associated with the monokinetids in the posterior half of the cell. There is no gradient in the distribution of these domains but a sharp boundary at the level of the future fission zone. The function of the pellicular rugs is unknown, but their specific distribution will be helpful in further studies...Continue Reading

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