el Ouggouti S, Bournier O, Boivin P, Bertrand O, Dhermy D. Purification of erythrocyte protein 4.1 by selective interaction with inositol hexaphosphate.
Protein Expr Purif 1992;
3:488-96. [PMID:
1486276 DOI:
10.1016/1046-5928(92)90066-6]
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Abstract
Protein 4.1 is a multifunctional structural protein occupying a strategic position in the erythrocyte membrane. It is present in the erythrocyte membrane skeleton and in many nonerythroid cells. This report describes a novel method for purifying this protein based on its selective interaction with inositol hexaphosphate dimagnesium tetrapotassium salt. This interaction was discovered in the course of chromatography of high-salt extract of inside-out membrane vesicles on Procion orange MX-2R-Sepharose. The new procedure is simple and selective and produces protein 4.1 with better yield than that obtained with a previously published procedure. The purified protein 4.1 has the same immunoreactivity and the same alpha-chymotryptic digest profile as protein 4.1 purified by published methods and is fully functional in enhancing the interaction between F-actin and spectrin dimers.
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