Abstract
Ca2+signaling is of paramount importance in intracellular communication of eukaryotic cells. Many external stimuli trigger a transient change in the cytosolic-free Ca2+concentration (in the form of a Ca2+wave or Ca2+oscillations). The internal Ca2+modulation is deciphered by Ca2+-binding proteins, which undergo conformational changes upon Ca2+-binding allowing them to act as enzymatic or protein modulators. These Ca2+-binding proteins have been well described in the past three decades (1–6). Calmodulin, an ubiquitous and multifunctional protein, is considered as the prototype of the Ca2+-binding protein family containing EF-hand domains (7–16). Because of its pivotal role in many Ca2+-dependent cellular events, the understanding of the mechanism of action of this protein at the molecular level has been the aim of several research groups. For such a study, four main points have to be tackled:
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Description of the mechanism of Ca2+-binding to calmodulin;
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Understanding of the conformational changes induced by Ca2+-binding;
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Analysis of the interaction of calmodulin with the different targets; and
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Deciphering the activation or the modulation of the calmodulin/target protein complexes.
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Haiech, J., Kilhoffer, MC. (2002). Deconvolution of Calcium-Binding Curves. In: Vogel, H.J. (eds) Calcium-Binding Protein Protocols: Volume 2: Methods and Techniques. Methods in Molecular Biology™, vol 173. Springer, Totowa, NJ. https://doi.org/10.1385/1-59259-184-1:025
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