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Calcium-Binding Protein Protocols Calcium-Binding Protein Protocols

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388 Török et al.<br />

Fig. 2. Electrospray mass spectrometry of undigested singly labeled and doubly<br />

labeled FL-calmodulin gave a series of peaks that correspond to protein molecules<br />

with varying net charges z. 100–200 pmol of protein were diluted in 10% acetonitrile<br />

0.1% formic acid solvent. (A) shows a mass-to-charge ratio m/z of each of the major<br />

peaks, the average mass is 17254.7 (± 5) Da. This mass represents calmodulin<br />

(16791.4 Da) bound to 5-DTAF (458.5 Da) at a single site. (B) shows two series of<br />

peaks, one represents calmodulin bound to 5-DTAF at two sites (17718 [± 10] Da)<br />

and the other series shows contamination by singly labeled FL-calmodulin (17258.62<br />

[± 10] Da).

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