| DLG5 Protein | |
|---|---|
| Protein Name | Discs Large Homolog 5 |
| Gene | [DLG5](/genes/dlg5) |
| UniProt ID | [Q9P2N7](https://www.uniprot.org/uniprot/Q9P2N7) |
| PDB ID | 6R3K, 5X2V |
| Molecular Weight | ~210 kDa (1,722 aa) |
| Subcellular Localization | Cell junctions, Cytoplasm, Synapses |
| Protein Family | MAGUK (Membrane-Associated Guanylate Kinase) family |
| Brain Expression | High in hippocampus, cortex, and cerebellum |
DLG5 (Discs Large Homolog 5) is a member of the membrane-associated guanylate kinase (MAGUK) family of scaffolding proteins[1]. Unlike other DLG family members, DLG5 possesses a unique architecture including an N-terminal L27 domain that distinguishes it from classical DLG proteins. As a scaffolding molecule, DLG5 plays critical roles in organizing protein complexes at cellular junctions, regulating cell polarity, and coordinating synaptic signaling. The protein is expressed throughout the body with particularly high levels in the brain, where it contributes to neuronal development, synaptic plasticity, and cognitive function[2].
DLG5's involvement in multiple cellular processes has made it a protein of interest in neurodegenerative disease research. Studies have implicated DLG5 variants in Alzheimer's disease susceptibility, and the protein's role in synaptic function suggests potential involvement in the synaptic loss that characterizes many neurodegenerative conditions. Additionally, DLG5's function in dopaminergic neurons has attracted attention in Parkinson's disease research[3].
This comprehensive page covers DLG5's molecular structure, its normal functions in the nervous system, its dysregulation in neurodegenerative diseases, and its potential as a therapeutic target.
DLG5 is a large multi-domain protein with distinctive features that enable its scaffolding functions:
N-terminal L27 Domain:
PDZ Domains (PDZ1-3):
SH3 Domain:
GUK (Guanylate Kinase) Domain:
C-terminal Region:
DLG5 adopts a modular architecture typical of MAGUK proteins but with distinctive features:
DLG5 plays essential roles in establishing and maintaining cellular polarity:
Epithelial Polarity:
Neuronal Polarity:
Tissue Architecture:
DLG5 is a critical regulator of synaptic structure and function:
Synaptic Scaffolding:
Synaptic Plasticity:
Synapse Formation:
DLG5 contributes to multiple aspects of brain development:
Neuronal Migration:
Axon Guidance:
Dendrite Development:
Recent studies have revealed DLG5's involvement in mitochondrial biology:
Mitochondrial Dynamics:
Energy Metabolism:
DLG5 has been implicated in Alzheimer's disease through multiple lines of evidence:
Genetic Associations:
Expression Changes:
Synaptic Loss:
Receptor Dysregulation:
Tau Pathology:
DLG5 is particularly important in dopaminergic neurons:
Vulnerability Factors:
Synaptic Function:
| Partner Protein | Interaction Type | Functional Consequence |
|---|---|---|
| PAR3 | Direct binding | Cell polarity coordination |
| PAR6 | Complex formation | Polarity establishment |
| PSD-95 | Synaptic targeting | Postsynaptic organization |
| GRIP1 | PDZ interaction | AMPA receptor trafficking |
| Magi | Complex formation | Junctional scaffolding |
Wnt/β-catenin Signaling:
PI3K/Akt Signaling:
MAPK/ERK Signaling:
DLG5 Knockout Mice:
Conditional Knockouts:
Gene Therapy:
Small Molecule Approaches:
Delivery:
Specificity:
Nakamura H, et al. Structure of the Drosophila Discs Large protein. Journal of Cell Biology. 2004. ↩︎
Ma L, et al. DLG5 regulates synaptic function and hippocampal development. Journal of Neuroscience. 2015. ↩︎
Yang J, et al. DLG5 in dopaminergic neuron function and Parkinson's disease. Movement Disorders. 2017. ↩︎ ↩︎
Weng J, et al. DLG5 regulates cell polarity and epithelial integrity. Nature Cell Biology. 2009. ↩︎
Suzuki A, et al. DLG5 and PAR3 complex in epithelial polarity. Nature Reviews Molecular Cell Biology. 2009. ↩︎
Iizuka M, et al. DLG5 in cell-cell junctions and tissue architecture. Developmental Biology. 2006. ↩︎
Park S, et al. DLG5 regulates AMPAR trafficking in hippocampal neurons. Journal of Cell Science. 2016. ↩︎
Liu X, et al. DLG5 and the maintenance of synaptic plasticity. Neurobiology of Learning and Memory. 2019. ↩︎
Zhang W, et al. DLG5 in neuronal migration and cortical development. Cerebral Cortex. 2020. ↩︎
Taylor J, et al. DLG5 in axon guidance and circuit formation. Development. 2017. ↩︎
Ruan W, et al. DLG5 regulates mitochondrial dynamics in neurons. Cell Death and Disease. 2018. ↩︎
Chen L, et al. DLG5 variants and susceptibility to Alzheimer's disease. Journal of Alzheimer's Disease. 2018. ↩︎
Kim H, et al. DLG5 and autism spectrum disorder: a genetic link. Molecular Autism. 2020. ↩︎
Wang J, et al. DLG5 mutations and neurodevelopmental disorders. Human Molecular Genetics. 2018. ↩︎
Xu Y, et al. DLG5 deficiency leads to impaired memory formation. Learning and Memory. 2021. ↩︎