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- W1519083075 abstract "The signal for the rapid internalization of the cation-independent mannose 6-phosphate/insulin-like growth factor-II receptor has been previously localized to the inner half of the 163-amino acid cytoplasmic tail, including tyrosine 24 and tyrosine 26 (Lobel, P., Fujimoto, K., Ye, R. D., Griffiths, G., and Kornfeld, S. (1989) Cell 57, 787-796). To define this signal more precisely, we generated a series of truncation and substitution mutants and analyzed them for their ability to mediate the endocytosis of extracellular lysosomal enzymes. Mutant receptors containing cytoplasmic domains of 29 or more amino acids functioned normally in endocytosis whereas a mutant receptor with a 28-amino acid cytoplasmic domain was internalized extremely slowly. Alanine scanning of the region between amino acids 19 and 30 identified tyrosine 26 and valine 29 as the most important residues for rapid receptor internalization. Tyrosine 24 and lysine 28 also contributed to the signal while the other amino acids were not critical. The tyrosine residues could be substituted with phenylalanines with no loss of activity, indicating the requirement for an aromatic residue in these positions rather than tyrosine specifically. Conservative substitutions of arginine or histidine for lysine 28 also preserved the internalization signal. These results indicate that the sequence Tyr-Lys-Tyr-Ser-Lys-Val serves as the internalization signal for the mannose 6-phosphate/insulin-like growth factor-II receptor. The crucial elements of this sequence are present in the cytoplasmic tails of a number of other membrane receptors and proteins known to undergo rapid internalization." @default.
- W1519083075 created "2016-06-24" @default.
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- W1519083075 date "1991-03-01" @default.
- W1519083075 modified "2023-10-02" @default.
- W1519083075 title "Localization of the signal for rapid internalization of the bovine cation-independent mannose 6-phosphate/insulin-like growth factor-II receptor to amino acids 24-29 of the cytoplasmic tail." @default.
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- W1519083075 doi "https://doi.org/10.1016/s0021-9258(19)67649-0" @default.
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