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• W1544224241 abstract "Pro-opiomelanocortin (POMC) is glycosylated and proteolytically cleaved to produce a number of smaller peptide hormones including adrenocorticotropic hormone (ACTH) and endorphin in mammalian pituitary and the mouse pituitary cell line AtT-20/D16v. When glycosylation of POMC is inhibited in AtT-20 cells with the drug tunicamycin, a 26,000-dalton protein appears in place of the glycosylated 29,000- and 32,000-dalton forms of POMC. The 26,000-dalton form found in tunicamycin-treated cells has the same [35S]methionine tryptic peptides as 29,000- and 32,000-dalton POMC, indicating that the decrease in apparent mass is most likely due to loss of carbohydrate and not to changes in the peptide backbone. The 4,500-dalton form of alpha(1-39)ACTH and the 3,000- and 11,000-dalton forms of endorphin are all present in tunicamycin-treated cells. The glycosylated form of alpha(1-39)ACTH, however, is missing and the glycosylated ACTH intermediates are replaced by unglycosylated ACTH intermediates. Pulse-chase studies demonstrate that the 26,000-dalton unglycosylated POMC is the precursor of the smaller ACTH and endorphin molecules in tunicamycin-treated cells. Furthermore, all of the forms of ACTH and endorphin found in tunicamycin-treated cells are secreted. Thus, it appears that glycosylation is not an essential step for correct cleavage or secretion of POMC or its products." @default.
• W1544224241 created "2016-06-24" @default.
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• W1544224241 date "1982-09-01" @default.
• W1544224241 modified "2023-09-30" @default.
• W1544224241 title "Effect of tunicamycin on the synthesis, processing, and secretion of pro-opiomelanocortin peptides in mouse pituitary cells." @default.
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• W1544224241 doi "https://doi.org/10.1016/s0021-9258(18)33993-0" @default.
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