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• W2079356894 abstract "Utilizing human P-glycoprotein (P-gp), we investigated methods to enhance the heterologous expression of ATP-binding cassette transporters in Saccharomyces cerevisiae. Human multidrug resistance gene MDR1 cDNA was placed in a high-copy 2 mu yeast expression plasmid under the control of the inducible GAL1 promoter or the strong constitutive PMA1 promoter from which P-gp was expressed in functional form. Yeast cells expressing P-gp were valinomycin resistant. Basal ATPase activity of P-gp in yeast membranes was 0. 4-0.7 micromol/mg/min indicating excellent functionality. P-glycoprotein expressed in the protease-deficient strain BJ5457 was found in the plasma membrane and was not N-glycosylated. By use of the PMA1 promoter, P-gp could be expressed at 3% of total membrane protein. The expression level could be further enhanced to 8% when cells were grown in the presence of 10% glycerol as a chemical chaperone. Similarly, glycerol enhanced protein levels of P-gp expressed under control of the GAL1 promoter. Glycerol was demonstrated to enhance posttranslational stability of P-gp. Polyhistidine-tagged P-gp was purified by metal affinity chromatography and reconstituted into proteoliposomes in milligram quantities and its ATPase activity was characterized. Turnover numbers as high as 12 s(-1) were observed. The kinetic parameters K(MgATP)(M), V(max), and drug activation were dependent on the lipid composition of proteoliposomes and pH of the assay and were similar to P-gp purified from mammalian sources. In conclusion, we developed a system for cost-effective, high-yield, heterologous expression of functional P-gp useful in producing large quantities of normal and mutant P-gp forms for structural and mechanistic studies." @default.
• W2079356894 created "2016-06-24" @default.
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• W2079356894 date "2000-04-01" @default.
• W2079356894 modified "2023-10-14" @default.
• W2079356894 title "Use of Chemical Chaperones in the Yeast Saccharomyces cerevisiae to Enhance Heterologous Membrane Protein Expression: High-Yield Expression and Purification of Human P-Glycoprotein" @default.
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• W2079356894 doi "https://doi.org/10.1006/abbi.2000.1712" @default.
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