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OTUB1  Protein, Antibody, ELISA Kit, cDNA Clone

Expression host: E. coli  
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OTUB1 Related Area

OTUB1 Related Pathways

    OTUB1 Summary & Protein Information

    OTUB1 Background

    Gene Summary: The product of OTUB1 gene is a member of the OTU (ovarian tumor) superfamily of predicted cysteine proteases. The encoded protein is a highly specific ubiquitin iso-peptidase, and cleaves ubiquitin from branched poly-ubiquitin chains but not from ubiquitinated substrates. It interacts with another ubiquitin protease and an E3 ubiquitin ligase that inhibits cytokine gene transcription in the immune system. It is proposed to function in specific ubiquitin-dependent pathways, possibly by providing an editing function for polyubiquitin chain growth. Alternative splicing results in multiple transcript variants. [provided by RefSeq, Jul 2008]
    General information above from NCBI
    Catalytic activity: Thiol-dependent hydrolysis of ester, thioester, amide, peptide and isopeptide bonds formed by the C-terminal Gly of ubiquitin (a 76-residue protein attached to proteins as an intracellular targeting signal). {ECO:0000269|PubMed:23827681}.
    Enzyme regulation: ENZYME REGULATION: By free ubiquitin: binding of free ubiquitin triggers conformational changes in the OTU domain and formation of a ubiquitin-binding helix in the N-terminus, promoting binding of the conjugated donor ubiquitin in UBE2N/UBC13 to OTUB1. {ECO:0000269|PubMed:22325355, ECO:0000269|PubMed:22367539}.
    Subunit structure: Isoform 1 and isoform 2 interact with RNF128. Isoform 1 forms a ternary complex with RNF128 and USP8. Isoform 1 interacts with the C-terminal UCH catalytic domain of USP8. Isoform 2 does not associate with USP8. Interacts with FUS, ESR1 and GNB2L1/RACK1. Interacts with UBE2N/UBC13. {ECO:0000269|PubMed:14661020, ECO:0000269|PubMed:18954305, ECO:0000269|PubMed:19383985, ECO:0000269|PubMed:20725033, ECO:0000269|PubMed:22325355, ECO:0000269|PubMed:22367539}.
    Domain: In addition to ubiquitin-binding at the Cys-91 active site, a proximal ubiquitin-binding site is also present at Cys-23 Occupancy of the active site is needed to enable tight binding to the second site. Distinct binding sites for the ubiquitins may allow to discriminate among different isopeptide linkages (i.e. 'Lys-48'-, 'Lys-63'-linked polyubiquitin) in polyubiquitin substrates and achieve linkage-specific deubiquitination. {ECO:0000269|PubMed:19211026}.
    Subcellular location: Cytoplasm {ECO:0000250}.
    Tissue specificity: Isoform 1 is ubiquitous. Isoform 2 is expressed only in lymphoid tissues such as tonsils, lymph nodes and spleen, as well as peripheral blood mononuclear cells. {ECO:0000269|PubMed:12704427, ECO:0000269|PubMed:14661020}.
    Sequence similarity: Belongs to the peptidase C65 family. {ECO:0000305}.; Contains 1 OTU domain. {ECO:0000255|PROSITE-ProRule:PRU00139}.
    General information above from UniProt

    Ubiquitin thioesterase OTUB1, also known as Deubiquitinating enzyme OTUB1, OTU domain-containing ubiquitin aldehyde-binding protein 1, Otubain-1, Ubiquitin-specific-processing protease OTUB1, OTUB1 and OTB1, is a cytoplasm protein which belongs to the peptidase C65 family. OTUB1 is a hydrolase that can remove conjugated ubiquitin from proteins and plays an important regulatory role at the level of protein turnover by preventing degradation. OTUB1 is a regulator of T-cell anergy, a phenomenon that occurs when T-cells are rendered unresponsive to antigen rechallenge and no longer respond to their cognate antigen. OTUB1 acts via its interaction with RNF128 / GRAIL, a crucial inductor of CD4 T-cell anergy. Isoform 1 of OTUB1 destabilizes RNF128, leading to prevent anergy. In contrast, isoform 2 of OTUB1 stabilizes RNF128 and promotes anergy. OTUB1 regulates RNF128-mediated ubiquitination, but does not deubiquitinate polyubiquitinated RNF128. Deubiquitinates estrogen receptor alpha (ESR1). OTUB1 mediates deubiquitination of 'Lys-48'-linked polyubiquitin chains, but not 'Lys-63'-linked polyubiquitin chains. OTUB1 is also capable of removing NEDD8 from NEDD8 conjugates, but with a much lower preference compared to 'Lys-48'-linked ubiquitin.

    OTUB1 Alternative Name

    OTB1,OTU1,HSPC263, [homo-sapiens]
    FLJ20113,FLJ40710,HSPC263,MGC111158,MGC4584,OTB1,OTU1,OTUB1, [human]
    AI850305,Otub1, [mouse]
    AI850305, [mus-musculus]

    OTUB1 Related Studies

  • Balakirev M.Y., et al., 2003, EMBO Rep. 4:517-522.
  • Soares L., et al., 2004, Nat. Immunol. 5:45-54.
  • Stanisic V., et al., 2009, J. Biol. Chem. 284:16135-16145.
  • Choudhary C., et al., 2009, Science 325:834-840.
  • Edelmann M.J., et al., 2009, Biochem. J. 418:379-390.