Calcium sensors in sea urchin sperm flagella.

@article{Brokaw1991CalciumSI,
  title={Calcium sensors in sea urchin sperm flagella.},
  author={Charles J. Brokaw},
  journal={Cell motility and the cytoskeleton},
  year={1991},
  volume={18 2},
  pages={
          123-30
        }
}
The asymmetry of ATP-reactivated flagellar bending waves of Triton-demembrated sea urchin spermatozoa has been measured over a range of free Ca2+ ion concentrations from 10(-9) to 10(-4) M. Detailed examination of the gradual response of asymmetry to Ca2+ ion concentration over this wide range indicates the presence of two Ca2+ sensors. A high-affinity sensor operates at Ca2+ concentrations near 10(-7.5) M. A lower-affinity sensor operates at Ca2+ concentrations above 10(-6) M, in the typical… CONTINUE READING
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