T-complex protein Ring Complex (TRiC), otherwise known as Chaperonin Containing TCP-1 (CCT), [a] is a multiprotein complex and the chaperonin of eukaryotic cells. Like the bacterial GroEL, the TRiC complex aids in the folding of ~10% of the proteome, and actin and tubulin are some of its best known substrates. [2] [3] TRiC is an example of a biological machine that folds substrates within the central cavity of its barrel-like assembly using the energy from ATP hydrolysis.
The human TRiC complex is formed by two rings containing 8 similar but non-identical subunits, each with molecular weights of ~60 kDa. The two rings are stacked in an asymmetrical fashion, forming a barrel-like structure with a molecular weight of ~1 MDa. [2] [3]
Subunit | MW (kDa) [A] | Features |
---|---|---|
TCP1 (CCT1/α) | 60 | |
CCT2 (β) | 57 | |
CCT3 (γ) | 61 | |
CCT4 (δ) | 58 | |
CCT5 (ε) | 60 | |
CCT6 (ζ) | 58 | Two copies in human genome, CCT6A and CCT6B. |
CCT7 (η) | 59 | |
CCT8 (θ) | 60 |
A Molecular weight of human subunits.
Counterclockwise from the exterior, each ring is made of the subunits in the following order: 6-8-7-5-2-4-1-3. [4]
This section is missing information about phylogeny (template) and evolutionary trajectory (pic).(December 2020) |
The CCT evolved from the archaeal thermosome ~2Gya, with the two subunits diversifying into multiple units. The CCT changed from having one type of subunit, to having two, three, five, and finally eight types. [4]: fig. 4
T-complex protein Ring Complex (TRiC), otherwise known as Chaperonin Containing TCP-1 (CCT), [a] is a multiprotein complex and the chaperonin of eukaryotic cells. Like the bacterial GroEL, the TRiC complex aids in the folding of ~10% of the proteome, and actin and tubulin are some of its best known substrates. [2] [3] TRiC is an example of a biological machine that folds substrates within the central cavity of its barrel-like assembly using the energy from ATP hydrolysis.
The human TRiC complex is formed by two rings containing 8 similar but non-identical subunits, each with molecular weights of ~60 kDa. The two rings are stacked in an asymmetrical fashion, forming a barrel-like structure with a molecular weight of ~1 MDa. [2] [3]
Subunit | MW (kDa) [A] | Features |
---|---|---|
TCP1 (CCT1/α) | 60 | |
CCT2 (β) | 57 | |
CCT3 (γ) | 61 | |
CCT4 (δ) | 58 | |
CCT5 (ε) | 60 | |
CCT6 (ζ) | 58 | Two copies in human genome, CCT6A and CCT6B. |
CCT7 (η) | 59 | |
CCT8 (θ) | 60 |
A Molecular weight of human subunits.
Counterclockwise from the exterior, each ring is made of the subunits in the following order: 6-8-7-5-2-4-1-3. [4]
This section is missing information about phylogeny (template) and evolutionary trajectory (pic).(December 2020) |
The CCT evolved from the archaeal thermosome ~2Gya, with the two subunits diversifying into multiple units. The CCT changed from having one type of subunit, to having two, three, five, and finally eight types. [4]: fig. 4