E3 ubiquitin ligase component of multiple cullin-RING-based E3 ubiquitin-protein ligase (CRLs) complexes which mediate the ubiquitination and subsequent proteasomal degradation of target proteins, including proteins involved in cell cycle progression, signal transduction, transcription and transcription-coupled nucleotide excision repair (PubMed:22118460). CRLs complexes and ARIH1 collaborate in tandem to mediate ubiquitination of target proteins, ARIH1 mediating addition of the first ubiquitin on CRLs targets (By similarity). The functional specificity of the E3 ubiquitin-protein ligase complexes depends on the variable substrate recognition components (By similarity). As a component of the CSA complex promotes the ubiquitination of ERCC6 resulting in proteasomal degradation (By similarity). Through the RING-type zinc finger, seems to recruit the E2 ubiquitination enzyme, like CDC34, to the complex and brings it into close proximity to the substrate (By similarity). Probably also stimulates CDC34 autoubiquitination (By similarity). May be required for histone H3 and histone H4 ubiquitination in response to ultraviolet and for subsequent DNA repair (By similarity). Promotes the neddylation of CUL1, CUL2, CUL4 and CUL4 via its interaction with UBE2M (By similarity). Involved in the ubiquitination of KEAP1, ENC1 and KLHL41 (By similarity). In concert with ATF2 and CUL3, promotes degradation of KAT5 thereby attenuating its ability to acetylate and activate ATM (By similarity). S-ubiquitinyl-[E2 ubiquitin-conjugating enzyme]-L-cysteine + [acceptor protein]-L-lysine = [E2 ubiquitin-conjugating enzyme]-L-cysteine + N(6)-ubiquitinyl-[acceptor protein]-L-lysine. S-[NEDD8-protein]-yl-[E2 NEDD8-conjugating enzyme]-L-cysteine + [cullin]-L-lysine = [E2 NEDD8-conjugating enzyme]-L-cysteine + N(6)-[NEDD8-protein]-yl-[cullin]-L-lysine. Protein modification; protein ubiquitination. Interacts with COPS6. Component of the DCX DET1-COP1 ubiquitin ligase complex at least composed of RBX1, DET1, DDB1, CUL4A and COP1. Part of an E3 ligase complex composed of RBX1, DDB1, DDB2 and CUL4A or CUL4B (PubMed:22118460). Interacts with CAND1 (PubMed:22118460). Interacts with UBE2M (By similarity). Part of a SCF complex consisting of CUL1, RBX1, SKP1 and SKP2. Part of a SCF-like complex consisting of CUL7, RBX1, SKP1 and FBXW8. Part of CBC(VHL) complexes with elongin BC complex (ELOB and ELOC), CUL2 or CUL5 and VHL. Part of the CSA complex (DCX(ERCC8) complex), a DCX E3 ubiquitin-protein ligase complex containing ERCC8, RBX1, DDB1 and CUL4A; the CSA complex interacts with RNA polymerase II; upon UV irradiation it interacts with the COP9 signalosome and preferentially with the hyperphosphorylated form of RNA polymerase II (By similarity). Part of multisubunit E3 ubiquitin ligase complexes with elongin BC complex (ELOB and ELOC), CUL2 and MED8; elongin BC complex (ELOB and ELOC), CUL5 and MUF1. Part of multisubunit complexes with elongin BC complex (ELOB and ELOC), elongin A/ELOA or SOCS1 or WSB1 and CUL5. Interacts directly with CUL1 and probably also with CUL2, CUL3, CUL4A, CUL4B, CUL5 and CUL7. Interacts with CDC34. Interacts with GLMN. GLMN competes for the binding site of the E2 ubiquitin-conjugating enzyme CDC34 and disrupts CDC34 binding. Part of a SCF complex consisting of CUL1, RBX1, SKP1 and FBXO2. Part of a SCF complex consisting of CUL1, FBXO3, RBX1 and SKP1; this complex interacts with PML via FBXO3. Component of the SCF(Cyclin F) complex consisting of CUL1, RBX1, SKP1 and CCNF. Identified in a SCF (SKP1-CUL1-F-box protein) E3 ubiquitin ligase complex together with HINT1 and CDC34 (By similarity). Component of multiple BCR (BTB-CUL3-RBX1) E3 ubiquitin-protein ligase complexes formed of CUL3, RBX1 and a variable BTB domain-containing protein. Part of the BCR(ENC1) complex containing ENC1. Part of the BCR(GAN) complex containing GAN. Part of the BCR(KLHL41) complex containing KLHL41. Part of the BCR(KEAP1) complex containing KEAP1 (By similarity). Interacts with SESN1 and SESN2 (By similarity). Interacts with NOTCH2 (By similarity). Component of the BCR(KLHL22) E3 ubiquitin ligase complex, at least composed of CUL3, KLHL22 and RBX1 (By similarity). Interacts with DCUN1D1, DCUN1D2, DCUN1D3, DCUN1D4 and DCUN1D5 (By similarity). Component of a BCR3 (BTB-CUL3-RBX1) E3 ubiquitin ligase complex, also named Cul3-RING ubiquitin ligase complex CUL3(KBTBD6/7), composed of CUL3, RBX1, KBTBD6 and KBTBD7 (By similarity). Widely expressed. The RING-type zinc finger domain is essential for ubiquitin ligase activity (By similarity). It coordinates an additional third zinc ion (PubMed:22118460). Belongs to the RING-box family.