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Hoffmann, R. A wiki for the life sciences where authorship matters. Nature Genetics (2008)
 
 
 
 
 

NIP- and NAP-taurine bind to external modifier site of AE1 (band 3), at which iodide inhibits anion exchange.

External iodide (I-o) inhibits AE1 (band 3)-mediated anion exchange in human red blood cells by binding to a noncompetitive inhibitory site, the external halide modifier site. External N-(4-azido-2-nitrophenyl)-2-aminoethyl sulfonate (NAP-taurine) and N-(4-isothiocyano-2-nitrophenyl)-2-aminoethyl sulfonate (NIP-taurine) also inhibit Cl- exchange noncompetitively. Increasing I-o decreases the inhibitory potency of NIP-taurine in a competitive fashion; this effect is not due to I- binding to the transport site, which has little effect on the NIP-taurine affinity. Bis(sulfosuccinimidyl)-suberate (BSSS) abolishes the noncompetitive inhibitory effect of I-o and greatly reduces the inhibitory effect of NAP-taurine. Together with previous work, these data suggest that external halides, such as I-, Br-, and probably also Cl-, bind to the same noncompetitive inhibitory site as do NAP- and NIP-taurine and that these reagents can be used to label the halide modifier site. Lys-539, a probable reaction site of BSSS, lies within the same segment of AE1 that is labeled by NAP-taurine and thus may be part of the modifier site.[1]

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