Centrin is a conserved protein that forms diverse associations with centrioles and MTOCs in Naegleria and other organisms - PubMed (original) (raw)
Centrin is a conserved protein that forms diverse associations with centrioles and MTOCs in Naegleria and other organisms
Y Y Levy et al. Cell Motil Cytoskeleton. 1996.
Abstract
Centrin, a approximately or equal to 20 kDa calcium-binding protein also known as caltractin, is a component of centrosome-associated algal flagellar roots capable of calcium-mediated contraction, and is also found in the centrosomes of vertebrate cells. Our analysis of a centrin gene from a protist, the amoeboflagellate Naegleria gruberi, reveals conserved features that distinguish centrins from calmodulin. Antibodies to bacterially expressed Naegleria centrin, which also recognize yeast Cdc31p, were employed to localize centrin immunoreactivity in selected organisms possessing specialized microtubule-organizing centers (MTOCs) or accessory structures. There is a striking morphological diversity of such structures. In the simplest associations, as found in Naegleria flagellates and vertebrates tracheal epithelium, centrin is intimately associated with the cylinder of the basal bodies. In cells with unfocused mitotic spindles, Naegleria amoebae and onion root tips, no localization of centrin was detected. In Dictyostelium discoideum and Saccharomyces cerevisiae, which lack centrioles, centrin immunoreactivity was observed as punctate cytoplasmic bodies but not associated with spindle pole MTOCs. In Paramecium multimicronucleatum, centrin immunoreactivity is localized to the infraciliary lattice, previously shown to exhibit calcium-mediated contraction. In Vorticella microstoma, known for the calcium-induced rapid contraction of its stalk, centrin immunoreactivity is localized to the contractile spasmoneme and myonemes. Similar antigens from Paramecium and Vorticella are detected by anti-centrin and anti-spasmin. The pattern of localization of centrin immunoreactivity supports the conjecture that a contractile system involving centrin, initially associated with centriolar structures, was recruited during evolution to build specialized organelles in different organisms and cell types.
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