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- W2418744997 abstract "Subsequent to swelling, the Amphiuma red blood cells lose K+, Cl-, and water until normal cell volume is restored. Net solute loss is the result of K+/H+ and Cl-/HCO3- exchangers functionally coupled through changes in pH and therefore HCO3-. Whereas the Cl-/HCO3- exchanger is constitutively active, K+/H+ actively is induced by cell swelling. The constitutive Cl-/HCO3- exchanger is inhibited by low concentrations (< 1 microM) of 4,4'-diisothiocyanostilbene-2,2'-disulfonic acid (DIDS) or H2DIDS, yet the concentration of H2DIDS > 25 microM irreversibly modifies the K+/H+ exchanger in swollen cells. We exploited the volume-dependent irreversible low-affinity reaction between H2DIDS and the K+/H+ to identify the protein(s) associated with K+/H+ exchange activity. Labeling of the membrane proteins of intact cells with 3H2DIDS results in high-affinity labeling of a broad 100-kDa band, thought to be the anion exchanger. Additional swelling-dependent low-affinity labeling at 110 kDa suggests the possibility of a volume-induced population of anion exchangers. Finally, the correlation between volume-sensitive K+/H+ modification and low-affinity labeling suggests that transport activity is associated with a protein of approximately 85 kDa. Although a 55-kDa protein is also labeled, it is a less likely candidate, since label incorporation and transport modification are less well correlated than that of the 85- and 110-kDa proteins." @default.
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- W2418744997 date "1994-10-01" @default.
- W2418744997 modified "2023-10-12" @default.
- W2418744997 title "Labeling of the Amphiuma erythrocyte K+/H+ exchanger with H2DIDS" @default.
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- W2418744997 doi "https://doi.org/10.1152/ajpcell.1994.267.4.c1002" @default.
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