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. 1983 Jan 1;81(1):95–126. doi: 10.1085/jgp.81.1.95

Relationship of net chloride flow across the human erythrocyte membrane to the anion exchange mechanism

PMCID: PMC2215565  PMID: 6833998

Abstract

The parallel effects of the anion transport inhibitor DIDS (4,4'- diisothiocyanostilbene-2,2'-disulfonate) on net chloride flow and on chloride exchange suggest that a major portion of net chloride flow takes place through the anion exchange system. The "slippage" model postulates that the rate of net anion flow is determined by the movement of the unloaded anion transport site across the membrane. Both the halide selectivity of net anion flow and the dependence of net chloride flux on chloride concentration over the range of 75 to 300 mM are inconsistent with the slippage model. Models in which the divalent form of the anion exchange carrier or water pores mediate net anion flow are also inconsistent with the data. The observations that net chloride flux increases with chloride concentration and that the DIDS- sensitive component tends to saturate suggest a model in which net anion flow involves "transit" of anions through the diffusion barriers in series with the transport site, without any change in transport site conformation such as normally occurs during the anion exchange process. This model is successful in predicting that the anion exchange inhibitor NAP-taurine, which binds to the modifier site and inhibits the conformational change, has less effect on net chloride flow than on chloride exchange.

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Selected References

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