SPOP

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]

Full Name

speckle-type POZ protein

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 MACROH2A1 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. Involved in the regulation of bromodomain and extra-terminal motif (BET) proteins BRD2, BRD3, BRD4 stability (PubMed:32109420).

Biological Process

Biological Process localizationManual Assertion Based On ExperimentIDA:DisProt
Biological Process proteasome-mediated ubiquitin-dependent protein catabolic processManual Assertion Based On ExperimentIMP:UniProtKB
Biological Process protein polyubiquitinationManual Assertion Based On ExperimentIDA:UniProtKB
Biological Process regulation of proteolysisManual Assertion Based On ExperimentIBA:GO_Central

Cellular Location

Nucleus
Nucleus speckle

Involvement in disease

Nabais Sa-de Vries syndrome 1 (NSDVS1):
An autosomal dominant disorder characterized by global developmental delay, impaired intellectual development, speech delay, and variable behavioral abnormalities. Affected individuals show congenital microcephaly and dysmorphic facial features, including round face, small palpebral fissures, highly arched eyebrows, and short nose.
Nabais Sa-de Vries syndrome 2 (NSDVS2):
An autosomal dominant disorder characterized by global developmental delay apparent from birth, impaired intellectual development, speech delay, dysmorphic facial features, and additional anomalies including congenital heart defects, sleep disturbances, hypotonia, and variable endocrine abnormalities.