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. 1984 Jul;81(14):4404–4408. doi: 10.1073/pnas.81.14.4404

Protein 4.1: its association with the human erythrocyte membrane.

K A Shiffer, S R Goodman
PMCID: PMC345598  PMID: 6589603

Abstract

125I-labeled protein 4.1a and 4.1b have equal ability to reassociate with inside-out erythrocyte vesicles that were depleted of protein 4.1 in addition to other peripheral membrane proteins. The reassociation of 125I-labeled protein 4.1 to protein 4.1-depleted vesicles at 4 degrees C is salt dependent, pH dependent, and saturable with a Kd of 42-50 nM and an extrapolated maximal binding capacity of 120-140 micrograms of protein 4.1 bound per mg of vesicle protein or 60-70 micrograms of protein 4.1 bound per mg of ghost protein, correlating with the protein 4.1 content in the erythrocyte membrane (6-7% of the total membrane protein). Selective proteolytic cleavage of these vesicles with papain (5 micrograms/ml at 4 degrees C) eliminates greater than 60% of the high-affinity binding sites; therefore, we conclude that the interaction of protein 4.1 with the cytoplasmic membrane surface is through a specific high-affinity protein-protein association.

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Selected References

These references are in PubMed. This may not be the complete list of references from this article.

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