84-5133-13　［取扱停止］OTUB1 100ul　505936

特徴

• Protein ubiquitination and deubiquitination are reversible processes catalyzed by ubiquitinating enzymes (UBEs) and deubiquitinating enzymes (DUBs).
• DUBs are categorized into 5 subfamilies: USP, UCH, OTU, MJD, and JAMM.
• The OTU subfamily comprises a group of approximately 100 putative cysteine proteases that are homologous to the ovarian tumor gene product of Drosophila.
• 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.OTUB1 exists as two isoforms that are generated by alternative splicing; the shorter 31kD isoform is ubiquitously expressed, while the longer 35kD isoform (ARF-1) has a more restricted expression pattern and is mostly detected in lymphoid organs.
• 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 SUMO-1, -2, and -3 or ISG15 conjugates.
• OTUB1 isoforms have been implicated in anergy induction in CD4+ T cells by regulating the stability of the E3 ligase GRAIL.
• 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.
• OTUB1 also appears to suppress MDM2-dependent ubiquitination of p53 independent of its catalytic activity, primarily by suppressing the activity of the MDM2 cognate E2 UbcH5.
• Applications:Suitable for use in Western Blot.
• Other applications not tested.
• Recommended Dilution:Western Blot: 1:500-1:1000Optimal dilutions to be determined by the researcher.
• Storage and Stability:May be stored at 4°C for short-term only.
• Aliquot to avoid repeated freezing and thawing.
• Store at -20°C.
• Aliquots are stable for 12 months.
• For maximum recovery of product, centrifuge the original vial after thawing and prior to removing the cap.