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• W2020020547 endingPage "156" @default.
• W2020020547 startingPage "149" @default.
• W2020020547 abstract "Lysosomal membrane glycoprotein termed LGP85 or LIMP II extends a COOH-terminal cytoplasmic tail of R459GQGSMDEGTADERAPLIRT478, in which an L475 I476 sequence lies as a di-leucine-based motif for lysosomal targeting. In the present study, we explored the role of the I476 residue in the localization of LGP85 to the endocytic organelles using two substitution mutants called I476A and I476L in which alanine and leucine are replaced at I476, respectively, and I476R477T478-deleted LGP85 called Delta 476-478. Immunofluorescence analyses showed that I476A and I476L are largely colocalized in intracellular organelles with an endogenous late endosomal and lysosomal marker, LAMP-1, but there were some granules in which staining for the LGP85 mutants was prominent, while Delta 476-478 is detected in LAMP-1-positive and LAMP-1-negative intracellular organelles, and on the cell surface. The subcellular fractionation studies revealed that I476A, I476L, and Delta 476-478 are different from wild-type LGP85 in the distribution of early endosomes, late endosomes, and lysosomes. I476A and I476L are present more in late endosomes than in the densest lysosomes, whereas wild-type LGP85 is mainly lysosomal. Substitution of I476 for A and L differentially modified the ratios of late endosomal to lysosomal LGP85. A major portion of Delta 476-478 resided in the light buoyant density fraction containing plasma membrane and early endosomes. Taken together, these results indicate that the existence of the 476th amino acid residue is essential for localization of LGP85 to late endocytic compartments. The fact that isoleucine but not leucine is in the 476th position is especially of importance in the proper distribution of LGP85 in late endosomes and lysosomes." @default.
• W2020020547 created "2016-06-24" @default.
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• W2020020547 date "2002-07-01" @default.
• W2020020547 modified "2023-09-27" @default.
• W2020020547 title "Ile (476), a constituent of di-leucine-based motif of a major lysosomal membrane protein, LGP85/LIMP II, is important for its proper distribution in late endosomes and lysosomes" @default.
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• W2020020547 doi "https://doi.org/10.1016/s0006-291x(02)00642-3" @default.
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