Abstract
Multidrug resistance-associated protein (MRP1) transports solutes in an ATP dependent manner by utilizing its two nonequivalent nucleotide binding domains (NBDs) to bind and hydrolyze ATP. The two NBDs possess different properties (Gao, M., Cui, H. R., Loe, D. W., Grant, C. E., Almquist, K. C., Cole, S. P., and Deeley, R. G. (2000) J. Biol. Chem. 275, 13098-13108; Hou, Y., Cui, L., Riordan, J. R., and Chang, X. (2000) J. Biol. Chem. 275, 20280-20287) and may play different roles during solute transport. We now report that NBD1 has moderately higher affinity for ATP than NBD2. The consequence of this difference is that the overall Kd value for wild-type MRP1 is mainly determined by ATP binding at NBD1. This conclusion is supported by the following: 1) mutation of the cysteine residue at 682 to alanine (C682A) in Walker A motif in NBD1 decreases the Kd value, indicating increased affinity for ATP; 2) mutation of the alanine residue at 1331 to cysteine (A1331C) in the Walker A motif of NBD2 does not have an effect on the Kd value; and 3) photolabeling of the protein with a cysteine residue in the Walker A motif of NBD1 is much more sensitive to N-ethylmaleimide modification than the protein with a cysteine residue in the Walker A ...Continue Reading
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