CUL1
a core scaffolding 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. The cullin subunit serves as a rigid scaffold of SCF complexes. May contribute to catalysis through positioning of the substrate and the ubiquitin-conjugating enzyme. The E3 ubiquitin-protein ligase activity of the complex depends on the neddylation of the cullin subunit. Interacts with multiple F-box proteins in SCF complexes, directing the ubiquitination of many substrates. These F-box proteins and associated substrates include: BTRC and FBXW11 bind CTNNB1 and participate in Wnt signaling; FBXW11 bind phosphorylated NFKBIA; BTRC binds NFKBIB, NFKBIE, ATF4, SMAD3, SMAD4, CDC25A, FBXO5 and probably NFKB2; SKP2 binds phosphorylated p27kip and is involved in regulation of G1/S transition; SKP2 binds ORC1, CDT1, RBL2, ELF4, CDKN1A, RAG2, FOXO1A, and probably MYC and TAL1; FBXW7 binds cyclin E, NOTCH1 released notch intracellular domain (NICD), and probably PSEN1; FBXW2 binds GCM1; FBXO32 binds MYOD1; FBXO7 binds BIRC2 and DLGAP5; FBXO33 binds YBX1; and Cyclin F binds CP110. Interacts with CHEK2, mediating its ubiquitination and regulating its function. Belongs to the cullin family. Note: This description may include information from UniProtKB.
SS: The number of records in which this modification site was determined using site-specific methods. SS methods include amino acid sequencing, site-directed mutagenesis, modification site-specific antibodies, specific MS strategies, etc.
