Determining the structure and mechanism of the human multidrug resistance P-glycoprotein using cysteine-scanning mutagenesis and thiol-modification techniques
Tw. Loo et Dm. Clarke, Determining the structure and mechanism of the human multidrug resistance P-glycoprotein using cysteine-scanning mutagenesis and thiol-modification techniques, BBA-BIOMEMB, 1461(2), 1999, pp. 315-325
The multidrug resistance P-glycoprotein is an ATP-dependent drug pump that
extrudes a broad range of hydrophobic compounds out of cells. Its physiolog
ical role is likely to protect us from exogenous and endogenous toxins. The
protein is important because it contributes to the phenomenon of multidrug
resistance during AIDS and cancer chemotherapy. We have used cysteine-scan
ning mutagenesis and thiol-modification techniques to map the topology of t
he protein, show that both nucleotide-binding domains are essential for act
ivity, examine packing of the transmembrane segments, map the drug-binding
site, and show that there is cross-talk between the ATP-binding sites and t
he transmembrane segments. (C) 1999 Elsevier Science B.V. All rights reserv
ed.