| NPTXR Protein | |
|---|---|
| Protein Name | Neuronal pentraxin receptor |
| Gene | NPTXR |
| UniProt ID | O95721 |
| PDB Structure | 5V7O, 5V7P |
| Molecular Weight | ~50 kDa |
| Subcellular Localization | Plasma membrane, synaptic vesicles |
| Protein Family | C-type lectin family, transmembrane receptors |
NPTXR (Neuronal Pentraxin Receptor) is a membrane-bound receptor protein that mediates the synaptic functions of the neuronal pentraxin family. It is encoded by the NPTXR gene and is expressed primarily in excitatory neurons throughout the brain, particularly in the hippocampus, cortex, and cerebellum. NPTXR serves as the receptor for NPTX1, NPTX2, and NPTX2, facilitating their roles in synaptogenesis, synaptic plasticity, and AMPA receptor trafficking. The protein is localized to both presynaptic and postsynaptic membranes where it participates in activity-dependent synapse formation and refinement. NPTXR has been implicated in neurodegenerative diseases, including Alzheimer's disease and epilepsy, where altered expression or function affects synaptic connectivity and neuronal excitability.
NPTXR is a type I transmembrane protein with an extracellular C-type lectin domain and a short cytoplasmic tail. The extracellular domain binds neuronal pentraxins (NPTX1, NPTX2), while the intracellular domain interacts with adaptor proteins involved in receptor trafficking. NPTXR can form homomers and potentially heteromers with other neuronal pentraxin family members.
NPTXR is essential for synaptic development and plasticity:
| Disease | Role | Mechanism |
|---|---|---|
| Alzheimer's Disease | Modifier | NPTXR affects amyloid-induced synaptic dysfunction |
| Epilepsy | Risk factor | NPTXR variants associated with seizure susceptibility |
| Intellectual Disability | Causative | NPTXR mutations cause synaptic dysfunction |
| Schizophrenia | Risk factor | Altered expression in schizophrenia brain |
| Neurodevelopmental Disorders | Modifier | Role in circuit formation |