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Calcium-Binding Protein Protocols Calcium-Binding Protein Protocols

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226 Drakenberg<br />

Fig. 5. 43 Ca NMR spectra at 24.3 MHz obtained for a sample containing 1 mM<br />

bovine testis calmodulin, 100 mM Na ClO 4 at pH 7.0 with the following additions (A)<br />

2.0 equ. Ca 2+ ; (B) 6 equ. Ca 2+ ; (C) 6 equ. Ca 2+ and 1.2 mM Dy(PPP) 2 7– ; (D) 6 mM<br />

Ca 2+ , 1.2 mM Dy(PPP) 2 7– , and 3 mM TFP. Reproduced with permission from ref. 29.<br />

As aforementioned, the 43 Ca NMR spectrum will depend strongly on the<br />

rate of calcium exchange between free calcium ions and ions bound to a protein.<br />

When the temperature dependence of the line shape is followed as a function<br />

of temperature, information about the exchange can be obtained if the<br />

exchange rate is faster than the relaxation rate of the free ion and not much

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