Calcium-binding proteins in a vorticellid contractile organelle.

  title={Calcium-binding proteins in a vorticellid contractile organelle.},
  author={W. Brad Amos and L M Routledge and F F Yew},
  journal={Journal of cell science},
  volume={19 1},
The proteins of the contractile spasmoneme of Zoothamnium have been examined for comparison with other motile systems. Though capable of calcium-induced contraction, glycerinated preparations of the spasmoneme contain neither actin nor tubulin at levels that can be detected in polyacrylamide gels. Sixty per cent of the protein in sodium dodecyl sulphate gels migrates in a band at a molecular weight of approximately 20,000, consisting largely of 2 similar protein species which are here given the… CONTINUE READING