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A more recent version of this article appeared on September 1, 2002
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Submitted on April 4, 2002
Revised on June 1, 2002
Accepted on June 28, 2002
1 Dartmouth College, Department of Biological Sciences, Hanover NH, 03755
* Corresponding author. E-mail address: elizabeth.f.smith{at}dartmouth.edu.
Ciliary and flagellar motility is regulated by changes in intraflagellar calcium. However, the molecular mechanism by which calcium controls motility is unknown. We tested the hypothesis that calcium regulates motility by controlling dynein-driven microtubule sliding and that the central pair and radial spokes are involved in this regulation. We isolated axonemes from Chlamydomonas mutants and measured microtubule sliding velocity in buffers containing 1mM ATP and various concentrations of calcium. In buffers with pCa greater than 8, microtubule sliding velocity in axonemes lacking the central apparatus (pf18 and pf15) was reduced compared to that of wild-type axonemes (Smith, 2002). In contrast, at pCa4, dynein activity in pf18 and pf15 axonemes was restored to wild-type level. The calcium-induced increase in dynein activity in pf18 axonemes was inhibited by antagonists of calmodulin and calmodulin dependent kinase II. Axonemes lacking the C1 central tubule (pf16) or lacking radial spoke components (pf14 and pf17) do not exhibit calcium induced increase in dynein activity in pCa4 buffer. We conclude that calcium regulation of flagellar motility involves regulation of dynein-driven microtubule sliding, that calmodulin and calmodulin dependent kinase II may mediate the calcium signal, and that the central apparatus and radial spokes are key components of the calcium signaling pathway.
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