Cell Signaling Technology

Product Pathways - Protein Stability

UBE3A (D10D3) Rabbit mAb #7526

Applications Reactivity Sensitivity MW (kDa) Isotype
W H M R Mk (B) (Dg) (Hr) Endogenous 98 Rabbit IgG

Applications Key:  W=Western Blotting
Reactivity Key:  H=Human  M=Mouse  R=Rat  Mk=Monkey  B=Bovine  Dg=Dog  Hr=Horse
Species cross-reactivity is determined by western blot. Species enclosed in parentheses are predicted to react based on 100% sequence homology.

Protocols

Specificity / Sensitivity

UBE3A (D10D3) Rabbit mAb recognizes endogenous levels of total UBE3A protein. Based upon sequence alignment, this antibody is predicted to cross-react with all UBE3A splice variants.

Source / Purification

Monoclonal antibody is produced by immunizing animals with a synthetic peptide corresponding to residues near the carboxy terminus of human UBE3A protein.

Western Blotting

Western Blotting

Western blot analysis of extracts from various cell lines using UBE3A (D10D3) Rabbit mAb.

Western Blotting

Western Blotting

Western blot analysis of extracts from 293T cells, either mock transfected (-) or transfected with a cDNA expression construct encoding transcript variant 3 of human UBE3A (hUBE3A, +), using UBE3A (D10D3) Rabbit mAb.

Background

UBE3A, also commonly referred to as E6AP (E6 Associated Protein), is an E3 ubiquitin protein ligase and founding member of the HECT (Homologous to the E6 Carboxyl Terminus) family of E3 ligases (1). UBE3A has been shown to be hijacked by the oncogenic E6 protein of high-risk human papillomaviruses (HPV16 and HPV18) that causes the ubiquitination activity of UBE3A to be inappropriately directed toward several specific cellular proteins, the most notable of which, with respect to carcinogenesis, is p53 (2). Although the DNA-repair enzyme, HHR23A (human homolog A of Rad23), was the first described E6-independent substrate of UBE3A, very few E6-independent targets of UBE3A have been identified. This continues to be an active area of research, particularly because mutations or disruption in expression of UBE3A in the brain are the cause of Angelman syndrome (AS), a severe form of mental retardation (3-6). Although UBE3A is expressed in most human tissues from both parental alleles, it is expressed from the maternal allele in subregions of the brain, with the paternal allele being epigenetically silenced. AS is caused by disruptions in expression of the materal UBE3A allele, generally by large chromosomal deletion, but also by point mutations within the UBE3A coding sequence. This strongly suggests that lack of ubiquitination of one or more UBE3A substrates in neuronal tissue is responsible for the AS phenotype (7). Indeed, a recent study identified several new neuronal substrates of UBE3A including Arc and Ephexin-5 (8). The immediate early gene Arc (activity-regulated cytoskeleton-associated protein) is rapidly upregulated after robust neuronal stimulation and promotes internalization of AMPA-type glutamate receptors (AMPARs), resulting in reduction in synaptic strength. UBE3A ubiquitinates Arc and promotes its degradation by the 26S proteasome, thus preventing AMPAR internalization (8). Disruption in neuronal UBE3A function leads to an increase in Arc expression and a decrease in AMPARs at excitatory synapses, which may contribute to the neurological symptoms of AS.

  1. Huibregtse, J.M. et al. (1995) Proc Natl Acad Sci U S A 92, 5249.
  2. Huibregtse, J.M. et al. (1993) Mol Cell Biol 13, 775-84.
  3. Fang, P. et al. (1999) Hum Mol Genet 8, 129-35.
  4. Jiang, Y. et al. (1999) Am J Hum Genet 65, 1-6.
  5. Jiang, Y.H. et al. (1998) Neuron 21, 799-811.
  6. Kumar, S. et al. (1999) J Biol Chem 274, 18785-92.
  7. Mabb, A.M. et al. (2011) Trends Neurosci 34, 293-303.
  8. Greer, P.L. et al. (2010) Cell 140, 704-16.

Application References

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For Research Use Only. Not For Use In Diagnostic Procedures.

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