Complex Effects of Papain on Function and Inhibitor Sensitivity of the Red Cell Anion Exchanger AE1 Suggest the Presence of Different Transport Subsites

Complex Effects of Papain on Function and Inhibitor Sensitivity of the Red Cell Anion Exchanger... Band 3 (AE1), the anion exchanger of the human erythrocyte membrane, mediates not only fluxes of small hydrophilic anions (e.g., chloride, oxalate), but also the flip-flop of long-chain amphiphilic anions (e.g., dodecylsulfate). Treatment of erythrocytes with papain, long known to inhibit the transport of the former type of anions, accelerates the transport of the latter type. In an attempt to elucidate the basis of these opposite responses to papain, several small amphiphilic arylalkyl sulfonates and -sulfates were tested for the response of their transport, via AE1, to papain. Although all these probes are most likely transported by a flux and not by flip-flop, their transport was inhibited by papain only in some cases, but accelerated in others. Different responses to papain therefore most likely do not reflect differences between transport by flux or by flip. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png The Journal of Membrane Biology Springer Journals

Complex Effects of Papain on Function and Inhibitor Sensitivity of the Red Cell Anion Exchanger AE1 Suggest the Presence of Different Transport Subsites

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Publisher
Springer-Verlag
Copyright
Copyright © Inc. by 2001 Springer-Verlag New York
Subject
Life Sciences; Biochemistry, general; Human Physiology
ISSN
0022-2631
eISSN
1432-1424
D.O.I.
10.1007/s002320010048
Publisher site
See Article on Publisher Site

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