cct5
Overview
<table class="infobox infobox-gene">
<tr>
<th class="infobox-header" colspan="2">cct5</th>
</tr>
<tr>
<td class="label">Gene Symbol</td>
<td>CCT5</td>
</tr>
<tr>
<td class="label">Full Name</td>
<td>Chaperonin Containing TCP1 Subunit 5 (Epsilon)</td>
</tr>
<tr>
<td class="label">Chromosomal Location</td>
<td>5p15.2</td>
</tr>
<tr>
<td class="label">NCBI Gene ID</td>
<td>1081</td>
</tr>
<tr>
<td class="label">OMIM ID</td>
<td>604832</td>
</tr>
<tr>
<td class="label">Ensembl ID</td>
<td>ENSG00000116560</td>
</tr>
<tr>
<td class="label">UniProt ID</td>
<td>P48643</td>
</tr>
<tr>
<td class="label">Protein Length</td>
<td>535 amino acids</td>
</tr>
<tr>
<td class="label">Molecular Weight</td>
<td>~56 kDa</td>
</tr>
<tr>
<td class="label">Approach</td>
<td>Description</td>
</tr>
<tr>
<td class="label">CCT enhancers</td>
<td>Increase chaperone activity</td>
</tr>
<tr>
<td class="label">Gene therapy</td>
<td>Modulate CCT expression</td>
</tr>
<tr>
<td class="label">Combination therapy</td>
<td>With other chaperones</td>
</tr>
<tr>
<td class="label">Interactor</td>
<td>Type</td>
</tr>
<tr>
<td class="label">Other CCT subunits</td>
<td>Complex members</td>
</tr>
<tr>
<td class="label">Actin</td>
<td>Substrate</td>
</tr>
<tr>
<td class="label">Tubulin</td>
<td>Substrate</td>
</tr>
<tr>
<td class="label">Hsp70</td>
<td>Co-chaperone</td>
</tr>
<tr>
<td class="label">KG Connections</td>
<td><a href="/atlas" style="color:#4fc3f7">1 edges</a></td>
</tr>
</table>
The CCT5 gene encodes the epsilon subunit of the Chaperonin Containing TCP1 (CCT) complex, also known as TRiC (TCP-1 Ring Complex). CCT5 is one of eight distinct subunits that comprise this essential hetero-oligomeric chaperone system required for the proper folding of cytoskeletal proteins including actin and tubulin[@yaffe2002].
The CCT complex is the primary cytosolic chaperone system in eukaryotes, essential for maintaining proteostasis in cells with high protein turnover. In neurons, where cytoskeletal dynamics are fundamental for synaptic function, axonal transport, and cellular integrity, CCT-mediated protein folding is critically important[@willison1999].
Gene Structure and Chromosomal Location
Protein Structure and Function
CCT Complex Architecture
The CCT complex is a barrel-shaped chaperone consisting of eight distinct subunits[@lopez1997]:
- Ring 1: CCT1 (α), CCT2 (β), CCT3 (γ), CCT4 (δ), CCT5 (ε)
- Ring 2: CCT6 (ζ), CCT7 (η), CCT8 (θ)
- Each subunit is approximately 50-60 kDa
- Total complex mass is approximately 1 MDa
CCT5 Structural Features
CCT5 contains characteristic chaperonin domains:
- Equatorial domain: ATP-binding site, inter-subunit interactions
- Apical domain: Substrate-binding sites, conformational changes
- Intermediate domain: Connects equatorial and apical regions
Chaperone Function
CCT5 participates in the ATP-dependent chaperone cycle[@kubota2005]:
Substrate binding: Unfolded protein binds to apical domains
Encapsulation: Folding chamber closes upon ATP binding
Folding: Protected environment allows proper folding
Release: ATP hydrolysis triggers substrate release
Recovery: Complex returns to initial stateSubstrate Specificity
The CCT complex folds numerous substrates[@frydman2001]:
- Actin: Essential for microfilament formation
- Tubulin: Required for microtubule assembly
- Vimentin: Intermediate filament component
- Cyclins: Cell cycle regulatory proteins
- G-protein subunits: Signaling molecules
Role in Neurodegenerative Diseases
Alzheimer's Disease
CCT dysfunction contributes to AD pathogenesis[@grantham2020]:
Tau pathology:
- CCT assists in tau protein folding
- Impaired function contributes to tau misfolding
- Affects cytoskeletal integrity
Synaptic dysfunction:
- Actin dynamics at synapses require CCT
- Axonal transport depends on tubulin folding
- Contributes to synaptic loss
Parkinson's Disease
CCT in PD pathogenesis[@brasseur2020]:
Alpha-synuclein:
- CCT can modulate α-synuclein aggregation
- Therapeutic implications
Neuronal vulnerability:
- Dopaminergic neurons require efficient protein folding
- CCT dysfunction contributes to death
Amyotrophic Lateral Sclerosis
CCT in ALS[@gottstein2022]:
Protein aggregation:
- TDP-43 requires CCT for proper folding
- FUS interactions with the complex
- Contributes to disease pathogenesis
Hereditary Neuropathy
CCT5 mutations cause hereditary sensory neuropathy[@rooney2019]:
- Autosomal recessive: Certain CCT5 variants cause disease
- Sensory dysfunction: Affects peripheral neurons
- Protein folding defects: Mutant subunits impair function
CCT in Normal Brain Function
Synaptic Function
CCT is essential for synaptic processes[@spong2019]:
- Dendritic spines: Actin dynamics require proper folding
- Axonal transport: Microtubule function depends on CCT
- Synaptic plasticity: Requires dynamic cytoskeleton
Neuronal Development
- Axon guidance: Cytoskeletal dynamics in growth cones
- Synapse formation: Assembly of synaptic machinery
Therapeutic Implications
Therapeutic Strategies
Challenges
- Complexity: Eight subunits with coordinated function
- Specificity: Achieving selective modulation
Expression Pattern
CCT5 is:
- Ubiquitously expressed: Across all tissues
- High in brain: Particularly in neurons
- Cytosolic localization: As part of the CCT complex
In brain:
- High in [neurons](/entities/neurons)
- Present in [astrocytes](/entities/astrocytes)
- Enriched in synaptic regions
Interaction Network
CCT5 interacts with:
Summary
CCT5 encodes the epsilon subunit of the CCT complex, an essential cytosolic chaperone required for folding of actin, tubulin, and other substrates. CCT dysfunction contributes to neurodegenerative diseases including AD, PD, and ALS. Mutations in CCT5 cause hereditary sensory neuropathy, demonstrating its essential role in neuronal function[@stadelmann2010][@valpuesta2002][@chen2020].
CCT5 in Cellular Physiology
Protein Quality Control Network
CCT5 operates within the broader proteostasis network:
- Cooperation with Hsp70: Hsp70 delivers substrates to CCT
- Proteasome collaboration: Degradation of misfolded proteins
- Autophagy connections: Aggregate clearance pathways
- Stress response integration: Links to heat shock response
ATP-Dependent Chaperone Cycle
The CCT chaperone cycle is highly regulated:
Substrate recognition: Unfolded polypeptide binds to apical domains
Encapsulation: ATP binding closes the folding chamber
Folding: Protected environment allows folding
Product release: ATP hydrolysis opens the chamber
Recovery: Complex returns to initial stateCCT5 in Hereditary Neuropathy
CCT5 mutations cause hereditary sensory neuropathy[@rooney2019]:
Disease Mechanism
- Autosomal recessive inheritance: Loss-of-function mutations
- Protein folding defects: Mutant subunits impair complex function
- Sensory neuron vulnerability: Peripheral neurons affected
Clinical Features
- Sensory loss: Loss of sensation in extremities
- Autonomic dysfunction: Autonomic symptoms
- Motor involvement: Variable motor involvement
Therapeutic Target Potential
Small Molecule Modulators
- ATPase modulators: Enhance CCT cycling
- Substrate stabilizers: Protect substrates during folding
- Co-chaperone enhancers: Improve substrate delivery
Gene Therapy Approaches
- Viral delivery: AAV-mediated CCT expression
- Combination strategies: With other chaperones
Pathway Diagram
The following diagram shows the key molecular relationships involving cct5 discovered through SciDEX knowledge graph analysis:
Mermaid diagram (expand to render)
Pathway Diagram
The following diagram shows the key molecular relationships involving cct5 discovered through SciDEX knowledge graph analysis:
Mermaid diagram (expand to render)