UBE2Z (USE1) [GST-tagged]


Catalogue Number
62-0060-020
Product Size
20 µg
Price £
£100
Accession Number
NP_075567.2
Residues Expressed
1-354
Alternate Product Size
100 µg
Certificate of Analysis Size
20 µg
Species
Human
Source
E. coli expression
Quantity
20 μg
Storage
-70°C
Concentration
1 mg/ml
Formulation
50 mM HEPES pH 7.5, 150 mM sodium chloride, 2 mM dithiothreitol, 10% glycerol
Molecular Weight
~65 kDa
Stability
12 months at -70°C; aliquot as required
Protein Sequence
Accession number: NP_075567.2. For full protein sequence information download the Certificate of Analysis pdf.
QA; Protein Identification
Confirmed by mass spectrometry.
QA Activity

E2-Ubiquitin Thioester Loading Assay: The activity of GST-UBE2Z was validated by loading E1 Uba6 activated ubiquitin onto the active cysteine of the GST-UBE2Z E2 enzyme via a transthiolation reaction. Incubation of the Uba6 and GST-UBE2Z enzymes in the presence of ubiquitin and ATP at 30°C was compared at two time points, T0 and T10 minutes. Under these conditions tested no GST-UBE2Z/ubiquitin thioester loading was observed.


Background

The enzymes of the FATylation pathway play a pivotal role in a number of cellular processes including regulated and targeted proteasomal degradation of ubiquitylated substrate proteins (Buchsbaum et al., 2011). Three classes of enzymes are involved in the process of FATylation; the activating enzyme Uba6, conjugating enzymes (E2s) and protein ligases (E3s). UBE2Z is a member of the E2 conjugating enzyme family and cloning of the human gene was first described by Gu et al. (2007) and Jin et al. (2007). UBE2Z is widely expressed in human tissues and expression is particularly high in the placenta, pancreas, spleen and testis (Gu et al., 2007). UBE2Z has been identified as an interaction partner of FAT10. FAT10 can be transferred from Uba6 to UBE2Z in vitro and both FAT10 and UBE2Z have been co-immunoprecipitated from intact cells. Down regulation of UBE2Z by siRNA resulted in a strong reduction of endogenous conjugate formation suggesting UBE2Z is the major E2 conjugating enzyme in the FAT10 cascade (Aichem et al., 2010).


References

Aichem, A., C. Pelzer, et al. (2010) USE1 is a bispecific conjugating enzyme for ubiquitin and FAT10, which FAT10ylates itself in cis. Nat Commun 1: 13.

Buchsbaum, S., B. Bercovich, et al. (2011) FAT10 is a proteasomal degradation signal which is itself regulated by ubiquitination. Mol Biol Cell. (in press)

Gu, X., F. Zhao, et al. (2007) Cloning and characterization of a gene encoding the human putative ubiquitin conjugating enzyme E2Z (UBE2Z). Mol Biol Rep 34(3): 183-8.

Jin, J., X. Li, et al. (2007) Dual E1 activation systems for ubiquitin differentially regulate E2 enzyme charging. Nature 447(7148): 1135-8.