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31 Rabbit

Western blot analysis of extracts from 293T cells, mock transfected or transfected with Myc/DDK-tagged human OTUB1 or human OTUB2, using OTUB1 Antibody (upper) or DYKDDDDK Tag Antibody (Binds to the same epitope as Sigma's Anti-FLAG® M2 Antibody) #2368 (lower).

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Product Usage Information

Storage: Supplied in 10 mM sodium HEPES (pH 7.5), 150 mM NaCl, 100 µg/ml BSA and 50% glycerol. Store at –20°C. Do not aliquot the antibody.

Specificity / Sensitivity

OTUB1 Antibody recognizes endogenous levels of total OTUB1 protein. This antibody does not cross-react with OTUB2 but may cross-react with OTUB1, isoform 2 (ARF-1).

Species predicted to react based on 100% sequence homology: Bovine, Dog, Horse

Source / Purification

Polyclonal antibodies are produced by immunizing animals with a synthetic peptide corresponding to residues surrounding Val117 of human OTUB1 protein, isoform 1. Antibodies are purified by protein A and peptide affinity chromatography.

Protein ubiquitination and deubiquitination are reversible processes catalyzed by ubiquitinating enzymes (UBEs) and deubiquitinating enzymes (DUBs) (1,2). DUBs are categorized into 5 subfamilies: USP, UCH, OTU, MJD, and JAMM (1,2). The OTU subfamily comprises a group of approximately 100 putative cysteine proteases that are homologous to the ovarian tumor gene product of Drosophila (3). OTUB1 and OTUB2 (OTU domain-containing Ubal-binding proteins) display no significant similarity to any known DUB, but are close homologs and possess an OTU domain that contains conserved cysteine, histidine, and aspartate residues that define the putative catalytic triad of cysteine proteases. Furthermore, sequence analysis of OTUB1 and OTUB2 reveals the presence of putative Ub-interaction motifs (UIMs) and Ub-associated domains (UBAs), which are characteristic of proteins that regulate protein ubiquitination. OTUB1 and OTUB2 also possess a putative nuclear localization signal (NLS) and a consensus LxxLL motif, which mediates the interaction between transcriptional co-activators and nuclear hormone receptors (4).

OTUB1 exists as two isoforms that are generated by alternative splicing; the shorter 31 kDa isoform is ubiquitously expressed while the longer 35 kDa isoform (ARF-1) has a more restricted expression pattern and is mostly detected in lymphoid organs (5). Biochemical analysis has demonstrated that OTUB1 has a preference for cleaving K48-linked polyubiquitin chains over K63-linked polyubiquitin chains and is capable of cleaving NEDD8, but not SUMO1/2/3 or ISG15 conjugates (6). OTUB1 isoforms have been implicated in anergy induction in CD4+ T cells by regulating the stability of the E3 ligase GRAIL (5). More recently, OTUB1 was found to bind to and inhibit the E2 activity of UBE2N through a novel mechanism not involving OTUB1 DUB activity, thus compromising the ability of the E3 ligase RNF168 to drive ubiquitination-dependent repair of DNA double-strand lesions (7).

1.  Nijman, S.M. et al. (2005) Cell 123, 773-86.

2.  Nalepa, G. et al. (2006) Nat Rev Drug Discov 5, 596-613.

3.  Makarova, K.S. et al. (2000) Trends Biochem Sci 25, 50-2.

4.  Balakirev, M.Y. et al. (2003) EMBO Rep 4, 517-22.

5.  Soares, L. et al. (2004) Nat Immunol 5, 45-54.

6.  Edelmann, M.J. et al. (2009) Biochem J 418, 379-90.

7.  Nakada, S. et al. (2010) Nature 466, 941-6.

Entrez-Gene Id 55611
Swiss-Prot Acc. Q96FW1

For Research Use Only. Not For Use In Diagnostic Procedures.
Cell Signaling Technology is a trademark of Cell Signaling Technology, Inc.
Anti-FLAG is a registered trademark of Sigma-Aldrich Biotechnology.

OTUB1 Antibody