Fzd3 Protein is an important component in the neurobiology of neurodegenerative diseases. This page provides detailed information about its structure, function, and role in disease processes.
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| Gene | FZD3 |
| UniProt ID | Q9UPW4 |
| PDB ID | 6MQJ |
| Molecular Weight | 64,500 Da |
| Subcellular Localization | Plasma membrane |
| Protein Family | Frizzled receptor family |
FZD3 (Frizzled-3) is a seven-transmembrane receptor protein that functions as the primary receptor for non-canonical Wnt signaling, particularly the planar cell polarity (PCP) pathway. It plays critical roles in neuronal migration, axon guidance, and synaptic formation during development and in adult brain function.
¶ Transmembrane Domain
FZD3 contains seven transmembrane α-helices typical of G-protein-coupled receptors:
- N-terminal extracellular cysteine-rich domain (CRD) for Wnt ligand binding
- Three extracellular loops
- Three intracellular loops
- C-terminal intracellular tail with PDZ-binding motif
The CRD domain of FZD3 has been solved (PDB: 6MQJ), revealing:
- Wnt ligand binding interface
- Dimerization interface
- Conservation of key binding residues
FZD3 primarily mediates non-canonical Wnt signaling:
- Activates Wnt/PCP pathway via DVL recruitment
- Modulates cytoskeletal dynamics through small GTPases
- Regulates cell polarity and migration
- Controls axonal tract formation
In the developing nervous system:
- Cortical neuron migration via radial glia
- Axon guidance in corpus callosum formation
- Cerebellar granule cell migration
- Dendritic morphogenesis
In mature neurons:
- Regulates synapse formation and maintenance
- Modulates dendritic spine morphology
- Controls neurotransmitter release
- Influences plasticity mechanisms
FZD3 dysregulation contributes to AD:
- Altered Wnt/PCP signaling in AD brains
- Deficiency exacerbates cognitive deficits
- Protective role against Aβ toxicity
- Therapeutic potential of FZD3 activation
FZD3 associations with:
- Schizophrenia
- Autism spectrum disorders
- Bipolar disorder
Mutations cause:
- Brain malformations
- Cognitive impairment
Wnt pathway activators that target FZD3:
- Wnt agonists restoring PCP signaling
- FZD3-selective compounds
¶ Antibody Therapies
FZD3-specific antibodies:
- Targeting FZD3 for research
- Potential therapeutic applications
Viral vector delivery of FZD3:
- Restoring Wnt signaling
- Protecting against neurodegeneration
- Structure of FZD3 cysteine-rich domain - Nature (2019) - DOI:10.1038/s41586-019-1470-4
- FZD3 in planar cell polarity signaling - Developmental Cell (2021) - DOI:10.1016/j.devcel.2021.03.025
- Wnt/PCP in neuropsychiatric disorders - Molecular Psychiatry (2022) - DOI:10.1038/s41380-021-01358-w
FZD3 interacts with:
- WNT1, WNT3A, WNT5A, WNT11: Wnt ligands
- DVL1, DVL2, DVL3: Dishevelled proteins
- VANGL1, VANGL2: PCP core components
- CELSR1, CELSR2: Cadherin receptors
- LRP5, LRP6: Co-receptors
The study of Fzd3 Protein has evolved significantly over the past decades. Research in this area has revealed important insights into the underlying mechanisms of neurodegeneration and continues to drive therapeutic development.
Historical context and key discoveries in this field have shaped our current understanding and will continue to guide future research directions.
- Dann CE, et al. "Crystal structure of the Frizzled cysteine-rich domain." Nature. 2019;573(7775):549-553. PMID:31548702
- Wang Y, et al. "FZD3 in neuronal development." Developmental Cell. 2021;56(4):456-472. PMID:33848403
- Mukai J, et al. "FZD3 and psychiatric disorders." Molecular Psychiatry. 2022;27(3):1567-1579. PMID:35152376