Speckle-type POZ protein

Definition:

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.

References:

[1]. Manabu Furukawa, et al. Targeting of protein ubiquitination by BTB-Cullin 3-Roc1 ubiquitin ligases. Nat Cell Biol. 2003 Nov;5(11):1001-7. [Content Brief]

[2]. Wesley J Errington, et al. Adaptor protein self-assembly drives the control of a cullin-RING ubiquitin ligase. Structure. 2012 Jul 3;20(7):1141-53. [Content Brief]

[3]. Maria J Nabais Sá, et al. De Novo Variants in SPOP Cause Two Clinically Distinct Neurodevelopmental Disorders. Am J Hum Genet. 2020 Mar 5;106(3):405-411. [Content Brief]

[4]. Min Zhuang, et al. Structures of SPOP-substrate complexes: insights into molecular architectures of BTB-Cul3 ubiquitin ligases. Mol Cell. 2009 Oct 9;36(1):39-50. [Content Brief]

[5]. Bogyou Kim, et al. Breast cancer metastasis suppressor 1 (BRMS1) is destabilized by the Cul3-SPOP E3 ubiquitin ligase complex. Biochem Biophys Res Commun. 2011 Dec 2;415(4):720-6. [Content Brief]

[6]. Jeong Eun Kwon, et al. BTB domain-containing speckle-type POZ protein (SPOP) serves as an adaptor of Daxx for ubiquitination by Cul3-based ubiquitin ligase. J Biol Chem. 2006 May 5;281(18):12664-72. [Content Brief]

[7]. Inmaculada Hernández-Muñoz, et al. Stable X chromosome inactivation involves the PRC1 Polycomb complex and requires histone MACROH2A1 and the CULLIN3/SPOP ubiquitin E3 ligase. Proc Natl Acad Sci U S A. 2005 May 24;102(21):7635-40. [Content Brief]

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