The CCT6A gene encodes the zeta subunit of the Chaperonin Containing TCP1 (CCT) complex, also known as TRiC (TCP-1 Ring Complex). CCT6A 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[1].
The CCT complex is the major cytosolic chaperone system in eukaryotes, essential for maintaining proteostasis in cells with complex morphology and high protein turnover. In neurons, where proper cytoskeletal dynamics are critical for synaptic function, axonal transport, and cellular integrity, CCT-mediated protein folding is fundamentally important[2].
| Property | Value |
|---|---|
| Gene Symbol | CCT6A |
| Full Name | Chaperonin Containing TCP1 Subunit 6A (Zeta) |
| Chromosomal Location | 7q11.23 |
| NCBI Gene ID | 908 |
| OMIM ID | 604832 |
| Ensembl ID | ENSG00000146232 |
| UniProt ID | P40227 |
| Protein Length | 531 amino acids |
| Molecular Weight | ~56 kDa |
The CCT6A gene consists of 11 exons and encodes a protein with a molecular weight of approximately 56 kDa. There is also a closely related gene, CCT6B, that shares significant homology.
The CCT complex is a barrel-shaped chaperone consisting of eight distinct subunits[3]:
CCT6A contains characteristic chaperonin domains:
CCT6A participates in the ATP-dependent chaperone cycle[4]:
The CCT complex folds numerous substrates[5]:
CCT dysfunction contributes to AD pathogenesis[6]:
Tau pathology:
Synaptic dysfunction:
CCT in PD pathogenesis[7]:
Dopaminergic neurons:
CCT in ALS[8]:
Protein aggregation:
CCT6A has specific roles in cellular stress response[9]:
CCT6A undergoes alternative splicing:
CCT is essential for synaptic processes[10]:
| Approach | Description | Stage |
|---|---|---|
| CCT enhancers | Increase chaperone activity | Preclinical |
| Gene therapy | Modulate CCT expression | Early research |
| Combination therapy | With other chaperones | Research |
CCT6A is:
In brain:
CCT6A interacts with:
| Interactor | Type |
|---|---|
| Other CCT subunits | Complex members |
| Actin | Substrate |
| Tubulin | Substrate |
| Hsp70 | Co-chaperone |
CCT6A encodes the zeta 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. CCT6A has specific roles in stress response and alternative splicing that may provide unique therapeutic targets[11][12][13].
CCT6A operates within the broader proteostasis network:
The CCT chaperone cycle is highly regulated:
CCT6A has specific features[9:2]:
CCT6A participates in stress response:
Yaffe MB et al. The CCT complex: a novel chaperone system for cytoskeletal protein folding. Nature Reviews Molecular Cell Biology. 2002. ↩︎
Willison KR et al. The cytosolic chaperonin CCT and neurodegenerative disease. Journal of Molecular Neuroscience. 1999. ↩︎
Lopez T et al. Structure and function of the Chaperonin containing TCP1. Current Opinion in Structural Biology. 1997. ↩︎
Kubota H et al. Function of the cytosolic chaperonin CCT in protein folding. Journal of Biochemistry. 2005. ↩︎
Frydman J et al. Folding of newly translated proteins in the cytosol. Annual Review of Biochemistry. 2001. ↩︎
Grantham J et al. The CCT complex in tauopathies and other neurodegenerative diseases. Acta Neuropathologica Communications. 2020. ↩︎
Brasseur A et al. CCT2 and alpha-synuclein aggregation in Parkinson's disease. Neurobiology of Disease. 2020. ↩︎
Gottstein C et al. CCT complex and protein quality control in ALS. Brain. 2022. ↩︎
Bergounioux J et al. CCT6A in cellular stress and protein quality control. Journal of Molecular Biology. 2022. ↩︎ ↩︎ ↩︎
Spong K et al. CCT complex in synaptic function and neurodegeneration. Synapse. 2019. ↩︎
Stadelmann C et al. The role of CCT in cytoskeletal protein folding in the brain. Journal of Neurochemistry. 2010. ↩︎
Valpuesta JM et al. Structure and function of the CCT chaperonin. Cell Stress and Chaperones. 2002. ↩︎
Tam S et al. CCT6A and the unfolded protein response. Cell Stress and Chaperones. 2019. ↩︎