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Calcium-Binding Protein Protocols Calcium-Binding Protein Protocols

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402 Török et al.<br />

Fig. 14. Localization of FL-dextran calmodulin during mitosis. 5 µM of FL-dextran<br />

was microinjected and the cells were inspected under the same conditions as for<br />

FL-calmodulin. FL-dextran reports distributions in the cytoplasmic water space and<br />

perhaps nonspecific binding. FL-dextran localizes cytoplasmically in comparison to<br />

FL-calmodulin, which binds specifically to the astral tubule array. Also, the localization<br />

of FL-dextran is far less well-defined, which suggests that binding of cellular<br />

structures is less specific.<br />

the two events, TA- and FL-calmodulin are both applied to the same cell and<br />

their fluorescence emissions are scanned simultaneously. The fluorescence of<br />

FL-calmodulin microinjected into sea urchin eggs (final concentration 3 µM) is<br />

relatively insensitive to Ca 2+ and target protein binding, but provides information<br />

on localization. Figure 15 shows a sequence of mitotic transitions in a sea<br />

urchin egg microinjected with FL-calmodulin.<br />

2. TA-calmodulin (final concentration of 10 µM) microinjected into the sea urchin<br />

eggs shows a 10-fold rise in fluorescence intensity on Ca 2+ and target protein<br />

binding. Figure 16 shows a sequence of mitotic transitions in a sea urchin egg<br />

microinjected with TA-calmodulin. Note the fluorescence intensity differences<br />

between FL-calmodulin and TA-calmodulin.

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