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Calcium-Binding Protein Protocols Calcium-Binding Protein Protocols

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Spatial Distribution of Ca 2+ -<strong>Binding</strong> <strong>Protein</strong>s 391<br />

Fig. 4. Amino acid sequence of human calmodulin showing peptide fragments<br />

expected from a typical tryptic digest, which catalyzes the hydrolysis of lysyl and<br />

arginyl peptide bonds. Lys 75 and Lys 148 are shown in bold to show that these were<br />

the two main 5-DTAF labeling sites in doubly labeled FL-calmodulin and Lys 75 only<br />

in singly labeled FL-calmodulin.<br />

Fig. 5. Electrospray mass spectrum of the desalted, freeze dried peptide from<br />

peak 7 isolated by HPLC dissolved in 10% acetonitrile 0.1% formic acid solvent.<br />

The first mass (1843.70 (± 0.37) Da) relates to peptide contamination from the<br />

preceeding peak, whereas the second mass (1901.91 (± 0.41) Da) relates to peptide<br />

fragment 75–86 with the 5-DTAF probe intramolecularly cyclized between two<br />

amino groups by substitution of both chlorines.

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