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• W1657811283 abstract "Since phosphonoformic acid (PFA) acts as a specific competitive inhibitor of Na+-Pi co-transport across renal brush-border membrane (BBM), we employed the [14C]PFA as a probe to determine the mechanism of its interaction with rat renal BBM. The binding of [14C]PFA to BBM vesicles (BBMV), with Na+ present in extravesicular medium (Na+o), was time- and temperature-dependent. The replacement of Na+o with other monovalent cations reduced the PFA binding by -80%. Cl- was the most effective accompanying monovalent anion as NaCl for maximum PFA binding. The Na+o increased the apparent affinity of BBMV for [14C]PFA binding, but it did not change the maximum binding capacity. The maximum [14C]PFA binding was achieved at Na+o approximately equal to 50 mM. The extent of Na+-dependent [14C]PFA binding correlated (r = 0.98; p less than 0.01) with percent inhibition by an equimolar dose of PFA of the (Na+o greater than Na+i)-dependent BBMV uptake of 32Pi. Intravesicular Na+ (Na+i) decreased [14C]PFA binding, on BBMV, and this inhibition by Na+i was dependent on the presence of Na+o. The increase in Na+i, at constant [Na+]o, decreased the Vmax, but not the Km, for [14C]PFA binding on BBMV. Bound [14C]PFA was displaced from BBMV by phosphonocarboxylic acids proportionally (r = 0.99; p less than 0.05) to their ability to inhibit (Na+o greater than Na+i)-gradient-dependent Pi transport, whereas other monophosphonates, diphosphonates, L-proline, or D-glucose did not influence the [14C]PFA binding. The Na+-dependent binding of [14C]PFA and of [3H]phlorizin by BBMV was 10 times higher than binding of these ligands to renal basolateral membranes and to mitochondria. [14C]PFA probably binds onto the same locus on the luminal surface of BBM, where Pi and Na+ form a ternary complex with the Na+-Pi co-transporter." @default.
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• W1657811283 date "1987-06-01" @default.
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• W1657811283 title "Interactions of [14C]phosphonoformic acid with renal cortical brush-border membranes. Relationship to the Na+-phosphate co-transporter." @default.
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• W1657811283 doi "https://doi.org/10.1016/s0021-9258(18)47517-5" @default.
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