title: Identification, purification, and characterization of a stilbenedisulfonate binding glycoprotein from canine kidney brush border membranes. A candidate for a renal anion exchanger.
abstract: Canine renal brush border membrane proteins that bind stilbenedisulfonate inhibitors of anion exchange were identified by affinity chromatography. A 130-kDa integral membrane glycoprotein from brush border membrane was shown to bind specifically to 4-acetamido-4'-isothiocyanostilbene-2,2'-disulfonate immobilized on Affi-Gel 102 resin. The bound protein could be eluted effectively with 1 mM 4-benzamido-4'-aminostilbene-2,2'-disulfonate (BADS). The 130-kDa protein did not bind to the affinity resin in the presence of 1 mM BADS or when the solubilized extract was covalently labeled with 4,4'-diisothiocyanostilbene-2,2'-disulfonate (DIDS). This protein was labeled with [3H]H2DIDS, and the labeling was prevented by BADS. The 130-kDa protein did not cross-react with antibody raised against human or dog erythrocyte Band 3 protein. The 130-kDa protein was accessible to proteinase K and chymotrypsin digestion in vesicles but not to trypsin. The 130-kDa protein was sensitive to endo-beta-N-acetylglucosaminidase F treatment both in the solubilized state and in brush border membrane vesicles showing that it was a glycoprotein and that the carbohydrate was on the exterior of the vesicles. This glycoprotein was resistant to endo-beta-N-acetylglucosaminidase H treatment suggesting a complex-type carbohydrate structure. The protein bound concanavalin A, wheat germ agglutinin, and Ricinus communis lectins, and it could be purified using wheat germ agglutinin-agarose.
authors.affiliation: Department of Biochemistry, University of Alberta, Edmonton, Canada.
authors.forename: S W
authors.initials: SW
authors.lastname: Pimplikar
authors.forename: R A
authors.initials: RA
authors.lastname: Reithmeier
mesh_terms: D017878:4,4'-Diisothiocyanostilbene-2,2'-Disulfonic Acid / Q000031:analogs & derivatives*; D012856:4-Acetamido-4'-isothiocyanatostilbene-2,2'-disulfonic Acid / Q000031:analogs & derivatives / Q000378:metabolism*; D000596:Amino Acids / Q000032:analysis; D000818:Animals; D003429:Cross Reactions; D004285:Dogs; D004591:Electrophoresis, Polyacrylamide Gel; D006023:Glycoproteins / Q000302:isolation & purification* / Q000378:metabolism; D007668:Kidney / Q000648:ultrastructure*; D008871:Microvilli / Q000032:analysis; D008970:Molecular Weight; D013267:Stilbenes / Q000378:metabolism*; D013997:Time Factors
chemical_list: D000596:Amino Acids; D006023:Glycoproteins; D013267:Stilbenes; C006711:benzoylamido-4'-aminostilbene-2,2'-disulfonate; D012856:4-Acetamido-4'-isothiocyanatostilbene-2,2'-disulfonic Acid; C018564:dihydro-DIDS; D017878:4,4'-Diisothiocyanostilbene-2,2'-Disulfonic Acid