UbcH5b Conjugating Enzyme, 100 µg

The His6-tagged fusion protein of UbcH5b is charge & support ubiquitinylation in vitro. The His6-tagged UbcH5 family members all appear to form thiol ester conjugates with ubiquitin at a similar rate under similar conditions.


Quality Level

biological source



>95% (SDS-PAGE)

mol wt

Mw 17 kDa



NCBI accession no.

UniProt accession no.

shipped in

dry ice

Gene Information

human ... UBE2D2(7322)

General description

Product Source: Recombinant human UbcH5b Conjugating Enzyme expressed in E. coli.
The His6-tagged fusion protein of UbcH5b is charge and support ubiquitinylation in vitro. Unlike their GST-tagged counterparts, the His6-tagged UbcH5 family members all appear to form thiol ester conjugates with ubiquitin at a similar rate under similar conditions. The His-tagged version of this enzyme is not susceptible to self-ubiquitinylation. UbcH5b is highly homologous to the S. cerevisiae UbC4/5 family of E2 enzymes, demonstrated to be essential for degradation of regulatory and abnormal proteins. UbcH5b, together with UbcH5a and UbcH5c, are the most active class of E2 enzymes in cell extracts and are associated with regulation of a number of transcription factors including p53, NF-κB, and c-Fos.

Storage and Stability

Stable for 1 year at -80°C from date of shipment. Avoid multiple freeze/thaw cycles. After initial defrost, aliquot into individual tubes and refreeze at -80°C.

Legal Information

UPSTATE is a registered trademark of Merck KGaA, Darmstadt, Germany


Unless otherwise stated in our catalog or other company documentation accompanying the product(s), our products are intended for research use only and are not to be used for any other purpose, which includes but is not limited to, unauthorized commercial uses, in vitro diagnostic uses, ex vivo or in vivo therapeutic uses or any type of consumption or application to humans or animals.

Certificate of Analysis

Certificate of Origin

Ubiquitin-conjugating enzymes UBC4 and UBC5 mediate selective degradation of short-lived and abnormal proteins.
Seufert, W and Jentsch, S
The Embo Journal, 9, 543-550 (1990)
J P Jensen et al.
The Journal of biological chemistry, 270(51), 30408-30414 (1995-12-22)
Two very closely related human E2 ubiquitin conjugating enzymes, UbfH5B and UbcH5C, have been identified. These enzymes are products of distinct genes and are 88-89% identical in amino acid sequence to the recently described human E2, UbcH5 (now designated UbcH5A)...
H Gonen et al.
The Journal of biological chemistry, 274(21), 14823-14830 (1999-05-18)
The last step in the activation of the transcription factor NF-kappaB is signal-induced, ubiquitin- and proteasome-mediated degradation of the inhibitor IkappaBalpha. Although most of the components involved in the activation and degradation pathways have been identified, the ubiquitin carrier proteins...

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