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The Occluded Nucleotide Conformation of P-Glycoprotein

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We review recent work on E552A/E1197A P-glycoprotein. This ATPase-defective mutant occludes MgATP tightly with maximal 1/1 stoichiometry in drug-sensitive fashion. The occluded nucleotide conformation appears to represent a transient, asymmetric, catalytic intermediate. We present a model for catalysis incorporating nucleotide binding domain (NBD) dimerization and the occluded nucleotide conformation, and we speculate as to how catalysis seen in P-glycoprotein might be harmonized with symmetrical dimer structures of isolated NBDs.

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Abbreviations

Pgp:

P-glycoprotein

NBD:

nucleotide binding domain

TMD:

transmembrane domain

Vi:

orthovanadate

BeFx:

beryllium fluoride

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Correspondence to Alan E. Senior.

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Tombline, G., Senior, A.E. The Occluded Nucleotide Conformation of P-Glycoprotein. J Bioenerg Biomembr 37, 497–500 (2005). https://doi.org/10.1007/s10863-005-9498-4

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