Moore RB, Plishker GA, Shriver SK. Purification and measurement of calpromotin, the cytoplasmic protein which activates calcium-dependent potassium transport.
Biochem Biophys Res Commun 1990;
166:146-53. [PMID:
2302198 DOI:
10.1016/0006-291x(90)91923-g]
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Abstract
A simple procedure is described for the purification of calpromotin, a protein from the cytoplasm of red blood cells which is capable of activating calcium-dependent potassium transport. The purification steps involve a salt gradient elution from an anion exchange column (Whatman DE-52) followed by a potassium phosphate gradient elution from a column of hydroxyapatite (HA Ultrogel). These steps result in a 54% yield with a 161 fold purification. The calpromotin is estimated to be 99% pure as determined by densitometry of the protein profile on an SDS polyacrylamide gel. A competitive enzyme-linked immunosorbent assay (ELISA) using rabbit anti-human calpromotin antibodies, is described for measuring levels of calpromotin in the 5 to 100 ng range.
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