Journal
JOURNAL OF BIOLOGICAL CHEMISTRY
Volume 284, Issue 49, Pages 34296-34307Publisher
AMER SOC BIOCHEMISTRY MOLECULAR BIOLOGY INC
DOI: 10.1074/jbc.M109.039727
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Funding
- National Institutes of Health [GM57428, GM74876]
- Nebraska Cancer and Smoking Disease Research
- Eppley Cancer Center Pediatric Cancer Research
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Earlier studies have demonstrated interaction of the murine major histocompatibility complex (MHC) class I molecule K-d with amyloid precursor-like protein 2 (APLP2), a ubiquitously expressed member of the amyloid precursor protein family. Our current findings indicate that APLP2 is internalized in a clathrin-dependent manner, as shown by utilization of inhibitors of the clathrin pathway. Furthermore, we demonstrated that APLP2 and K-d bind at the cell surface and are internalized together. The APLP2 cytoplasmic tail contains two overlapping consensus motifs for binding to the adaptor protein-2 complex, and mutation of a tyrosine shared by both motifs severely impaired APLP2 internalization and ability to promote K-d endocytosis. Upon increased expression of wild type APLP2, K-d molecules were predominantly directed to the lysosomes rather than recycled to the plasma membrane. These findings suggest a model in which APLP2 binds K-d at the plasma membrane, facilitates uptake of K-d in a clathrin-dependent manner, and routes the endocytosed K-d to the lysosomal degradation pathway. Thus, APLP2 has a multistep trafficking function that influences the expression of major histocompatibility complex class I molecules at the plasma membrane.
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