APLP1
Domain
The NPXY sequence motif found in many tyrosine-phosphorylated proteins is required for the specific binding of the PID domain. However, additional amino acids either N- or C-terminal to the NPXY motif are often required for complete interaction. The NPXY site is also involved in clathrin-mediated endocytosis.
Function
May play a role in postsynaptic function. The C-terminal gamma-secretase processed fragment, ALID1, activates transcription activation through APBB1 (Fe65) binding (By similarity). Couples to JIP signal transduction through C-terminal binding. May interact with cellular G-protein signaling pathways. Can regulate neurite outgrowth through binding to components of the extracellular matrix such as heparin and collagen I.
The gamma-CTF peptide, C30, is a potent enhancer of neuronal apoptosis.
Post-translational modifications
Proteolytically cleaved by caspases during neuronal apoptosis. Cleaved, in vitro, at Asp-620 by caspase-3 (By similarity).
N- and O-glycosylated. O-glycosylation with core 1 or possibly core 8 glycans. Glycosylation on Ser-227 is the preferred site to Thr-228.
Sequence Similarities
Belongs to the APP family.
Tissue Specificity
Expressed in the cerebral cortex where it is localized to the postsynaptic density (PSD).
Cellular localization
- Cell membrane
- Single-pass type I membrane protein
- C30
- Cytoplasm
- C-terminally processed in the Golgi complex.
Alternative names
Amyloid beta precursor like protein 1, Amyloid beta (A4) precursor-like protein 1, Amyloid-like protein 1, APLP, APLP-1, APLP1