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Decoding the Bell-Shaped Calcium Spikes in Phosphorylation Cycles of Flagella
Miljko Satarić1,2, Tomas Nemeš1, Jack Tuszynski3
1Faculty of Technical Sciences, University of Novi Sad, 21000 Novi Sad, Serbia.
Abstract:
We investigate the messenger role of calcium ions implicated in the regulation of wave-like bending dynamics of flagella. The emphasis is on microtubules of flagellar axoneme serving as nonlinear transmission lines for bell-shaped spikes of calcium ions. The calcium sensitive proteins, such as calmodulin, exhibit activation dependence on the spike train frequency and amplitude. Here, we analyze a Ca2+ decoding module IDA-I1 whose activity is controlled by Ca2+ activated kinase. We find that trains of Ca2+ spikes are advantageous compared to a constant rise in Ca2+ concentration as being more efficient and much less prone to noisy fluctuations.
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