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• W2030906585 abstract "OATP2B1 is an important member of the organic anion transporting polypeptides (OATP) family and is implicated in the intestinal and hepatic disposition of endo- and xenobiotics. The purpose of this work was to produce a highly purified protein for use as a reference standard for quantification of OATP2B1 in human tissue and in vitro assay systems. Here, we report the successful expression, purification and characterization of OATP2B1 in a heterologous expression system. Protein expressed by the Sf9-baculovirus expression system is functionally active as demonstrated by saturable uptake kinetics with a K(m) of 5.9+/-0.76 microM for estrone-3-sulfate. OATP2B1 was extracted from Sf9-membranes with ABS-14-4 detergent and purified using a one-step FLAG-tag purification method. Yield of OATP2B1 from Sf9 cells was 1.1mg per liter of culture, for a final recovery of 1.8%. SDS-PAGE resolution and Western blot of purified protein displayed multiple banding of OATP2B1-specific protein, which was thoroughly investigated to confirm homogeneity of the sample. C-terminal FLAG-tag purification and immunoblot detection, together with N-terminal sequencing, confirmed the presence of only full-length protein. Treatment with endoglycosidases had little effect on the migration pattern in SDS-PAGE, suggesting that multiple banding was not due to different glycosylation states of the protein. Amino acid analysis further confirmed the homogeneity of the protein with a calculated extinction coefficient of 80,387 cm(-1) M(-1). Physical, biochemical and functional characterization show that purified human OATP2B1 is pure, homogeneous and appropriate for use as a standard to quantitate expression of OATP2B1 in in vitro systems and tissue samples." @default.
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• W2030906585 date "2008-02-01" @default.
• W2030906585 modified "2023-09-26" @default.
• W2030906585 title "Expression, purification and characterization of the human membrane transporter protein OATP2B1 from Sf9 insect cells" @default.
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• W2030906585 doi "https://doi.org/10.1016/j.pep.2007.10.007" @default.
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