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Calcium-Binding Protein Protocols Calcium-Binding Protein Protocols

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336 Kobayashi<br />

Fig. 6. Affinity chromatography of recombinant S-100A12 on an Amlexanox-<br />

Toyopearl column (A) or a Fluphenazine-Sepharose column (B). Ca 2+ , sample loading<br />

followed by washing with the Ca 2+ -containing (Buffer B); EGTA, addition of the buffer<br />

containing 2 mM EGTA (Buffer C); urea, addition of the buffer containing 6 M urea<br />

(Buffer D). C and D, 12% Tricine/SDS/PAGE analyses of the recombinant S-100A12<br />

and the Ca 2+ -wash, EGTA eluate and urea eluate (Ca 2+ , EGTA, urea) from an<br />

Amlexanox-Toyopearl column (C) and a fluphenazine-Sepharose column (D).<br />

2. Because of the hydrophobic nature of the drugs used here, the drug affinity columns<br />

work largely similar to calcium-dependent hydrophobic interaction chromatography.<br />

Hence, it is extremely important to perform these experiments at<br />

salt concentrations and temperatures as indicated, otherwise results will vary considerably.<br />

References<br />

1. Jamieson, G. A. and Vanaman, T. C. (1979) <strong>Calcium</strong>-dependent affinity chromatography<br />

of calmodulin on an immobilized phenothiazine. Biochem. Biophys. Res.<br />

Commun. 90, 1048–1056.<br />

2. Marshak, D. R., Watterson, D. M., and Van Eldik, L. J. (1981) <strong>Calcium</strong>-dependent<br />

interaction of S100b, troponin C, and calmodulin with an immobilized phenothiazine.<br />

Proc. Natl. Acad. Sci. USA 78, 6793–6797.

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