Zherebtsova MA, Kazbekov EN. Affinity identification of organic anion transporters in brush-border membrane vesicles from rat kidney.
BIOCHIMICA ET BIOPHYSICA ACTA 1994;
1192:117-24. [PMID:
8204641 DOI:
10.1016/0005-2736(94)90151-1]
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Abstract
The inhibitory properties of bromoacetyl-p-aminohippuric acid as the affinity probe of the organic anion transport system were studied. Bromoacetylated p-aminohippurate was shown to be able to inhibit irreversibly the p-aminohippurate (PAH) uptake in brush-border membrane vesicles. The inhibition depends on both the time of treatment and the affinity probe concentration. The treatment of brush-border membrane with 1 mM bromoacetyl-p-aminohippurate for 1.5 h results in 100% irreversible inhibition of PAH transport but no changes were observed in the activity of alkaline phosphatase, gamma-glutamyltranspeptidase or maltase. The affinity labelling of the organic anion transporters was performed with bromoacetyl-p-amino[3H]hippuric acid. It was shown, by means of SDS-polyacrylamide gel electrophoresis, that the probe bound covalently to the brush-border membrane proteins with molecular masses of 28 kDa, 63 kDa, 98 kDa, and > 150 kDa. The data obtained with SITS and probenecid as the organic anion transport inhibitors indicate that brush-border membrane proteins of 28 kDa, 63 kDa, 98 kDa may correspond to the organic anion transport system.
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