CUL1

Cullin-1 ;
CUL-1 ;

function:Core component of multiple cullin-RING-based SCF (SKP1-CUL1-F-box protein) E3 ubiquitin-protein ligase complexes, which mediate the ubiquitination of proteins involved in cell cycle progression, signal transduction and transcription. In the SCF complex, serves as a rigid scaffold that organizes the SKP1-F-box protein and RBX1 subunits. May contribute to catalysis through positioning of the substrate and the ubiquitin-conjugating enzyme. The E3 ubiquitin-protein ligase activity of the complex is dependent on the neddylation of the cullin subunit and is inhibited by the association of the deneddylated cullin subunit with TIP120A/CAND1. The functional specificity of the SCF complex depends on the F-box protein as substrate recognition component. SCF(BTRC) and SCF(FBXW11) direct ubiquitination of CTNNB1 and participates in Wnt signaling. SCF(BTRC) and SCF(FBXW11) direct ubiquitination of phosphorylated NFKBIA. SCF(BTRC) directs ubiquitination of NFKBIB, NFKBIE, ATF4, SMAD3, SMAD4, CDC25A, FBXO5 and probably NFKB2. SCF(SKP2) directs ubiquination of phosphorylated CDKN1B/p27kip and is involved in regulation of G1/S transition. SCF(SKP2) directs ubiquination of ORC1L, CDT1, RBL2, ELF4, CDKN1A, RAG2, FOXO1A, and probably MYC and TAL1. SCF(FBXW7) directs ubiquitination of cyclin E, NOTCH1 released notch intracellular domain (NICD), and probably PSEN1. SCF(FBXW2) directs ubiquitination of GCM1. SCF(FBXO32) directs ubiquitination of MYOD1. SCF(FBXO7) directs ubiquitination of BIRC2 and DLGAP5. SCF(FBXO33) directs ubiquitination of YBX1 (By similarity). SCF(FBXO11) does not seem to direct ubiquitination of TP53. Interacts with FBXW8. Interacts with CUL7; the interaction seems to be mediated by FBXW8.,pathway:Protein modification; protein ubiquitination.,PTM:Neddylated; which enhances the ubiquitination activity of SCF. Deneddylated via its interaction with the COP9 signalosome (CSN) complex.,similarity:Belongs to the cullin family.,subunit:Component of multiple SCF (SKP1-CUL1-F-box) E3 ubiquitin-protein ligase complexes formed of CUL1, SKP1A, RBX1 and a variable F-box domain-containing protein as substrate-specific subunit. Component of the SCF(BTRC) complex containing BTRC. Component of the SCF(FBXW11) complex containing FBXW11. Component of the SCF(SKP2) complex containing SKP2, in which it interacts directly with SKP1, SKP2 and RBX1. Component of the SCF(FBXW2) complex containing FBXw2. Component of the SCF(FBXO32) complex containing FBXO32. Component of the probable SCF(FBXO7) complex containing FBXO7. Component of the SCF(FBXO11) complex containing FBXO11. Component of the SCF(FBXO25) complex containing FBXO25. Component of the SCF(FBXO33) complex containing FBXO33. Component of the probable SCF(FBXO4) complex containing FBXO4. Interacts with RNF7. Part of a complex with TIP120A/CAND1 and RBX1. The unneddylated form interacts with TIP120A/CAND1 and the interaction negatively regulates the association with SKP1 in the SCF complex. Interacts with COPS2. Can self-associate.,tissue specificity:Expressed in lung fibroblasts.,

G1/S transition of mitotic cell cycle, mitotic cell cycle, proteolysis, ubiquitin-dependent protein catabolic process,apoptosis, induction of apoptosis, cell cycle, cell cycle arrest, cell death, cell proliferation, negative regulation of cell proliferation, induction of apoptosis by intracellular signals, macromolecule catabolic process, positive regulation of macromolecule metabolic process, regulation of cell death, positive regulation of cell death, programmed cell death,induction of programmed cell death, death, modification-dependent protein catabolic process, cell cycle process, cell cycle phase, protein catabolic process, regulation of protein ubiquitination, positive regulation of protein ubiquitination, regulation of protein modification process, positive regulation of protein modification process,regulation of cellular protein metabolic process, positive regulation of cellular protein metabolic process, regulation of cell proliferation, regulation of apoptosis, positive regulation of apoptosis, regulation of programmed cell death,positive regulation of programmed cell death, positive regulation of catalytic activity, modification-dependent macromolecule catabolic process, positive regulation of molecular function, cellular protein catabolic process, cellular macromolecule catabolic process, positive regulation of protein metabolic process, interphase, interphase of mitotic cell cycle, regulation of ligase activity, positive regulation of ligase activity, positive regulation of ubiquitin-protein ligase activity during mitotic cell cycle, regulation of ubiquitin-protein ligase activity, regulation of ubiquitin-protein ligase activity during mitotic cell cycle, positive regulation of ubiquitin-protein ligase activity, proteolysis involved in cellular protein catabolic process,

Expressed in lung fibroblasts.