Abstract
Using rat liver canalicular plasma membrane vesicles, it has been verified that the transport of p-nitrophenyl glucuronide (NPG) across membranes is an ATP-dependent process; the apparent Km for NPG was 20 microM. S-(2,4-dinitrophenyl)-glutathione (DNP-SG) inhibited NPG uptake dose-dependently, and NPG or testosterone glucuronide did ATP-dependent DNP-SG uptake similarly. These results suggest that transport of glucuronide is mediated by an ATP-dependent glutathione S-conjugate carrier.
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