SPOP

The BTB (POZ) domain mediates dimerization and interaction with CUL3.

The MATH domain mediates interaction with protein-ubiquitin ligase substrates, such as MACROH2A1 and BMI1.

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). Plays an essential role for proper translation, but not for their degradation, of critical DNA replication licensing factors CDT1 and CDC6, thereby participating in DNA synthesis and cell proliferation (PubMed:36791496). Regulates interferon regulatory factor 1/IRF1 proteasomal turnover by targeting S/T-rich degrons in IRF1 (PubMed:37622993). Facilitates the lysosome-dependent degradation of enterovirus EV71 protease 2A by inducing its 'Lys-48'-linked polyubiquitination, which ultimately restricts EV71 replication (PubMed:37796126). Acts as an antiviral factor also against hepatitis B virus/HBV by promoting ubiquitination and subsequent degradation of HNF1A (PubMed:38018242). In turn, inhibits HBV transcription and replication by preventing HNF1A stimulating activity of HBV preS1 promoter and enhancer II (PubMed:38018242).

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.

None

The disease is caused by variants affecting the gene represented in this entry.

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.

None

The disease is caused by variants affecting distinct genetic loci, including the gene represented in this entry.

Protein modification; protein ubiquitination.

Belongs to the Tdpoz family.

Widely expressed.

• Nucleus
• Nucleus speckle
• Cytoplasm

Speckle-type POZ protein, HIB homolog 1, Roadkill homolog 1, SPOP

• entrezGene:8405
• omim:602650
• swissprot:O43791

Proteins

Oncology

• Epigenetics
• Immuno-oncology

42132Da