Cullin
Cullins are a family of hydrophobic scaffold proteins which provide support for ubiquitin ligases (E3). All eukaryotes appear to have cullins. They combine with RING proteins to form Cullin-RING ubiquitin ligases (CRLs) that are highly diverse and play a role in myriad cellular processes, most notably protein degradation by ubiquitination.
| Cullin | |||||||||
|---|---|---|---|---|---|---|---|---|---|
structure of the cul1-rbx1-skp1-f boxskp2 scf ubiquitin ligase complex | |||||||||
| Identifiers | |||||||||
| Symbol | Cullin | ||||||||
| Pfam | PF00888 | ||||||||
| InterPro | IPR001373 | ||||||||
| PROSITE | PDOC00967 | ||||||||
| SCOP2 | 1ldj / SCOPe / SUPFAM | ||||||||
| |||||||||
| Cullin protein neddylation domain | |||||||||
|---|---|---|---|---|---|---|---|---|---|
structure of the cul1-rbx1-skp1-f boxskp2 scf ubiquitin ligase complex | |||||||||
| Identifiers | |||||||||
| Symbol | Cullin_Nedd8 | ||||||||
| Pfam | PF10557 | ||||||||
| InterPro | IPR019559 | ||||||||
| |||||||||
The human genome contains eight cullin genes
- CUL1, part of SCF complex
- CUL2, part of ECS complex (Elongin C - CUL2 - SOCS-box)
- CUL3, part of CUL3-BTB complex
- CUL4A
- CUL4B
- CUL5
- CUL7
- CUL9, also known as PARC
There is also a more distant member called ANAPC2 (or APC2), part of the Anaphase-promoting complex.
CUL1, 2, 3, 4A, 4B, 5 and 7 each form part of a multi-subunit ubiquitin complex.
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