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• W1484236229 startingPage "11940" @default.
• W1484236229 abstract "The structural and functional roles of the single asparagine (N)-linked oligosaccharide chain of Band 3 (AE1), the anion transport protein of the human erythrocyte membrane, were examined. Purified Band 3 (M(r) = 95,000) in 0.1% octaethylene glycol mono n-dodecyl ether (C12E8) detergent solution was deglycosylated using N-glycosidase F. This treatment sharpened the protein band on sodium dodecyl sulfate gel electrophoresis and decreased its apparent molecular weight by 5,000. The purified membrane domain could be deglycosylated under similar conditions, causing a shift from a broad band centered at 55 kDa to a sharp 46-kDa band. Band 3 was shown to bind tomato lectin, and loss of lectin binding on blots provided a sensitive assay for deglycosylation. Carbohydrate analysis revealed that greater than 80% of the oligosaccharide could be removed from Band 3 by N-glycosidase F digestion. The deglycosylated protein maintained its dimeric structure and level of detergent binding but had a smaller Stokes radius (RS = 72 A) than native Band 3 (RS = 75 A). The Stokes radius of the membrane domain (RS = 60 A) also decreased upon deglycosylation (RS = 58 A). Circular dichroism studies showed that deglycosylation did not change the secondary structure of Band 3 or the membrane domain. The sensitivity of Band 3 or the membrane domain to proteolytic digestion by trypsin or proteinase K was also unaffected by deglycosylation. The deglycosylated protein aggregated more rapidly and was much more readily precipitable by ammonium sulfate. The deglycosylated protein bound the anion transport inhibitor 4-benzamido-4'-amino-stilbene-2,2'-disulfonate with the same affinity (Kd = 1 microM) as the native protein. Transport studies using reconstituted Band 3 and resealed ghosts showed that deglycosylated Band 3 retained its ability to transport anions. We conclude that removal of the oligosaccharide chain from Band 3 and any resultant structural changes had no effect on the transport function of this protein." @default.
• W1484236229 created "2016-06-24" @default.
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• W1484236229 date "1992-06-01" @default.
• W1484236229 modified "2023-10-14" @default.
• W1484236229 title "Enzymatic deglycosylation of human Band 3, the anion transport protein of the erythrocyte membrane. Effect on protein structure and transport properties." @default.
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• W1484236229 doi "https://doi.org/10.1016/s0021-9258(19)49787-1" @default.
• W1484236229 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/1601863" @default.
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