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• W1601112148 abstract "The precursor for transforming growth factor-alpha (TGF-alpha) is a membrane glycoprotein that can establish contact with epidermal growth factor/TGF-alpha receptors on adjacent cells or can be cleaved to release TGF-alpha that diffuses into the medium. Cleavage of pro-TGF-alpha occurs at Ala/Leu-Ala/Leu-Ala-Val-Val sites located at each end of the mature TGF-alpha sequence. To characterize the cleavage process of pro-TGF-alpha and the role of glycosylation in this process, we have introduced a pro-TGF-alpha expression vector in wild type Chinese hamster ovary (CHO) cells and in the mutant CHO cell clone ldlD that has a reversible defect in protein glycosylation. Analysis of metabolically labeled and cell surface-labeled products immunoprecipitated with antibodies directed against the extracellular TGF-alpha sequence and the cytoplasmic pro-TGF-alpha C-terminal domain shows that cleavage of pro-TGF-alpha in wild type CHO cells occurs in two steps. Both processing steps occur after pro-TGF-alpha reaches the cell surface. In the first step, pro-TGF-alpha rapidly (t1/2 = 30 min) loses the amino-terminal segment that precedes the TGF-alpha sequence. In the second step, pro-TGF-alpha is cleaved at the carboxyl terminus of the TGF-alpha sequence releasing this factor into the medium. This second step is slow (t1/2 = 2 h). The action of pancreatic elastase added to CHO-TGF-alpha cells mimics the first step but not the second one. Synthesis, cell surface exposure, rate of cleavage, and generation of bioactive TGF-alpha in ldlD-TGF-alpha cells are not markedly affected by the lack of N-acetylgalactosamine-dependent protein O-glycosylation or galactose-dependent glycan chain modification. The results indicate that, despite their similarity in amino acid sequence, the two cleavage sites that flank TGF-alpha may be processed with different kinetics which can lead to retention of pro-TGF-alpha on the cell surface." @default.
• W1601112148 created "2016-06-24" @default.
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• W1601112148 date "1990-04-01" @default.
• W1601112148 modified "2023-09-29" @default.
• W1601112148 title "Generation of transforming growth factor-alpha from the cell surface by an O-glycosylation-independent multistep process." @default.
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• W1601112148 doi "https://doi.org/10.1016/s0021-9258(19)39341-x" @default.
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