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• W2113003186 abstract "It has been suggested that the cytoplasmic amino-terminal tail of invariant chain (Ii) contains a sorting signal that directs trafficking of the major histocompatibility complex (MHC) class II: Ii oligomeric complex to endocytic compartments. This model is based, in part, on the observation that in the absence of MHC class II molecules, Ii is detectable in lysosomal structures, a phenotype that is dependent on an intact NH2 terminus. However, the route by which Ii gains access to endosomal compartments in the absence of class II molecules remains uncertain. Here we report a mechanism that localizes Ii in lysosomal compartments independently of class II. We show that murine Ii can be detected by immunofluorescence within late endocytic compartments of stably transfected Ltk- mouse fibroblasts. Immunochemical studies indicate that degradation of Ii in these cells is sensitive to the lysosomotropic agent ammonium chloride, yet the majority of Ii that undergoes this apparent lysosomal degradation is sensitive to the enzyme endoglycosidase H. This finding suggests that Ii may reach the lysosomal compartment by a route that bypasses the Golgi complex. Consistent with this possibility, we found that in contrast to Ii which is complexed to class II molecules, transport of free Ii to lysosomes is prevented by 3-methyladenine, an inhibitor of the autophagic pathway of protein degradation, a process which involves direct transport from the endoplasmic reticulum to lysosomes. These data suggest the route of transport that leads to endosomal localization of Ii in the absence of class II is distinct from that taken when expressed with class II. This forces a re-evaluation of the concept that the cytosolic tail of Ii contains a dominant Golgi-to-endosomal sorting signal." @default.
• W2113003186 created "2016-06-24" @default.
• W2113003186 creator A5022795978 @default.
• W2113003186 creator A5074802230 @default.
• W2113003186 date "1995-04-01" @default.
• W2113003186 modified "2023-10-16" @default.
• W2113003186 title "In the absence of major histocompatibility complex class II molecules, invariant chain is translocated to late endocytic compartments by autophagy" @default.
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• W2113003186 doi "https://doi.org/10.1002/eji.1830250408" @default.
• W2113003186 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/7737293" @default.
• W2113003186 hasPublicationYear "1995" @default.
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