Centrin-Mediated Cell Motility in Algae

  • Michael Melkonian
  • Peter L. Beech
  • Christos Katsaros
  • Dorothee Schulze
Part of the Current Phycology book series (CP)

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 Swimming 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© Routledge, Chapman & Hall, Inc. 1992

Authors and Affiliations

  • Michael Melkonian
  • Peter L. Beech
  • Christos Katsaros
  • Dorothee Schulze

There are no affiliations available

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