This gene encodes a protein that may modulate the transcriptional repression activities of death-associated protein 6 (DAXX), which interacts with histone deacetylase, core histones, and other histone-associated proteins. In mouse, the encoded protein binds to the putative leucine zipper domain of macroH2A1.2, a variant H2A histone that is enriched on inactivated X chromosomes. The BTB/POZ domain of this protein has been shown in other proteins to mediate transcriptional repression and to interact with components of histone deacetylase co-repressor complexes. Alternative splicing of this gene results in multiple transcript variants encoding the same protein. [provided by RefSeq, Jul 2008].
Function:
Component of a cullin-RING-based BCR (BTB-CUL3-RBX1) E3 ubiquitin-protein ligase complex that mediates the ubiquitination of target proteins, leading most often to their proteasomal degradation. In complex with CUL3, involved in ubiquitination and proteasomal degradation of BRMS1, DAXX, PDX1/IPF1, GLI2 and GLI3. In complex with CUL3, involved in ubiquitination of H2AFY and BMI1; this does not lead to their proteasomal degradation. Inhibits transcriptional activation of PDX1/IPF1 targets, such as insulin, by promoting PDX1/IPF1 degradation. The cullin-RING-based BCR (BTB-CUL3-RBX1) E3 ubiquitin-protein ligase complex containing homodimeric SPOP has higher ubiquitin ligase activity than the complex that contains the heterodimer formed by SPOP and SPOPL.
Subunit:
Interacts with GLI2 and GLI3. Homodimer and homooligomer. Heterodimer with SPOPL. Each dimer interacts with two CUL3 molecules. Part of cullin-RING-based BCR (BTB-CUL3-RBX1) E3 ubiquitin-protein ligase complexes that contain CUL3 and homodimeric SPOP, or the heterodimer formed by SPOP and SPOPL, plus a target protein, such as H2AFY, PDX1/IPF1, BMI1, BRMS1 and DAXX.
Subcellular Location:
Nucleus. Nucleus speckle.
Tissue Specificity:
Widely expressed.
Similarity:
Belongs to the Tdpoz family.
Contains 1 BTB (POZ) domain.
Contains 1 MATH domain.
SWISS:
O43791
Gene ID:
1685
Database links:
Entrez Gene: 1685 Human
Entrez Gene: 20747 Mouse
Entrez Gene: 287643 Rat
Omim: 602650 Human
SwissProt: O43791 Human
SwissProt: Q6ZWS8 Mouse
Unigene: 463382 Human
Unigene: 285454 Mouse
Unigene: 162165 Rat
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