Algal Cell Motility pp 179-221 | Cite as
Centrin-Mediated Cell Motility in Algae
Abstract
Centrin-mediated motility represents a novel cell motility mechanism in eukaryotic cells that has attracted considerable attention in recent years (for reviews see Melkonian, 1989; Salisbury, 1989a,b). The principal protein involved in this type of motility, centrin, was first isolated from an algal flagellate (Salisbury et al., 1984) and since then has been found to be a ubiquitous structural protein of the eukaryotic centrosome (Salisbury et al., 1986; Baron and Salisbury, 1988; Hiraoka et al., 1989). Centrin is a Ca2+-modulated phosphoprotein of the EF-hand protein family and shares significant sequence homologies with other members of this family, including calmodulin and the yeast CDC31 gene product (Salisbury et al., 1984; Huang et al., 1988b; Moncrief et al., 1990). Centrin-mediated cell motility is characterized by contraction of a filamentous structure within less than 20 ms, and much slower reextension of this structure to its original length (in the range of a few seconds up to about 1 h). Contraction of centrin filaments is based on supercoiling, not on sliding, initiated by elevated intracellular Ca2+ levels and is independent of ATP hydrolysis. Reextension of centrin filaments requires removal of Ca2+ from the protein and ATP.
Keywords
Basal Body Basal Apparatus Flagellar Apparatus Cell BioI Forward SwimmingPreview
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References
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