The ciliary axoneme is the minimal structure responsible for Ca2+-dependent modulation of ciliary movement. We demonstrated that, in Tetrahymena ciliary axonemes, beta-tubulin was exclusively phosphorylated by an endogenous Ca2+/calmodulin-dependent protein kinase(s). The phosphorylation of beta-tubulin also occurred in the outerdoublet microtubule fraction… (More)
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