BRISC complex subunit Abraxas 2 - Q15018 (ABRX2_HUMAN)

 

Protein Feature View of PDB entries mapped to a UniProtKB sequence  

 
Function
Component of the BRISC complex, a multiprotein complex that specifically cleaves 'Lys-63'-linked polyubiquitin, leaving the last ubiquitin chain attached to its substrates (PubMed:19214193, PubMed:20032457, PubMed:20656690, PubMed:24075985). May act as a central scaffold protein that assembles the various components of the BRISC complex and retains them in the cytoplasm (PubMed:20656690). Plays a role in regulating the onset of apoptosis via its role in modulating 'Lys-63'-linked ubiquitination of target proteins (By similarity). Required for normal mitotic spindle assembly and microtubule attachment to kinetochores via its role in deubiquitinating NUMA1 (PubMed:26195665). Plays a role in interferon signaling via its role in the deubiquitination of the interferon receptor IFNAR1; deubiquitination increases IFNAR1 activities by enhancing its stability and cell surface expression (PubMed:24075985, PubMed:26344097). Down-regulates the response to bacterial lipopolysaccharide (LPS) via its role in IFNAR1 deubiquitination (PubMed:24075985). Required for normal induction of p53/TP53 in response to DNA damage (PubMed:25283148). Independent of the BRISC complex, promotes interaction between USP7 and p53/TP53, and thereby promotes deubiquitination of p53/TP53, preventing its degradation and resulting in increased p53/TP53-mediated transcription regulation and p53/TP53-dependent apoptosis in response to DNA damage (PubMed:25283148). UniProt
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Subunit Structure
Component of the BRISC complex, at least composed of ABRAXAS2, BRCC3/BRCC36, BABAM2 and BABAM1/NBA1 (PubMed:19214193, PubMed:20032457, PubMed:21282113, PubMed:24075985, PubMed:25283148, PubMed:26344097, PubMed:26195665). Interacts with BRCC3/BRCC36; the interaction is direct (PubMed:20032457, PubMed:20656690, PubMed:26344097). Interacts with BABAM1 (PubMed:21282113). Does not interact with BRCA1 (PubMed:17525340, PubMed:21282113). Interacts with SHMT1 and SHMT2; the interaction is direct. Identified in a complex with SHMT2 and the other subunits of the BRISC complex (PubMed:24075985). The BRISC complex binds monoubiquitin and both 'Lys-48'- and 'Lys-63'-linked polyubiquitin (PubMed:20032457). Identified in complexes with IFNAR1, IFNAR2 and SHMT2 (PubMed:24075985). Interacts with THAP5 (PubMed:21195082). Interacts with ATF4 (PubMed:22974638). Identified in a complex with p53/TP53 and USP7; interacts directly with both proteins (PubMed:25283148). Interacts with NUMA1 (PubMed:26195665). Interacts with microtubule minus ends (PubMed:26195665). Binds polyubiquitin (PubMed:19261749). UniProt
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Data in green originates from UniProtKB  
Variation data (sourced from UniProt) shows non-genetic variation from the ExPASy   and dbSNP   websites.
Data in yellow originates from Pfam  , by interacting with the HMMER3 web site  
Data in purple originates from Phosphosite  .
Data in orange originates from the SCOP   (version 1.75) and SCOPe   (version 2.04) classifications.
Data in grey has been calculated using BioJava  . Protein disorder predictions are based on JRONN (Troshin, P. and Barton, G. J. unpublished), a Java implementation of RONN  
  • Red: potentially disorderd region
  • Blue: probably ordered region.
Hydropathy has been calculated using a sliding window of 15 residues and summing up scores from standard hydrophobicity tables.
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Data in blue originates from PDB
  • Secstruc: Secondary structure projected from representative PDB entries onto the UniProt sequence.
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The PDB to UniProt mapping is based on the data provided by the EBI SIFTS project. See also Velankar et al., Nucleic Acids Research 33, D262-265 (2005).
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