UbcH4 Protein, active, 50 µg

C-terminal cMyc and 6His-tagged, recombinant human Smac/DIABLO amino acids 56-end, expressed in E.coli

Ubiquitin-conjugating (E2) enzymes are characterized by the presence of a highly conserved ubiquitin-conjugating domain which accommodates ATP-activated ubiquitin (Ub) via a covalently linked thioester onto its active-site residue. E2 enzymes act via selective protein-protein interactions with the ubiquitin-activating E1 enzyme and ubiquitin ligase E3 enzymes and are able to differentiate effects on downstream substrates, either with a single Ub molecule or a Ub chain. While E3s are involved in substrate selection, E2s are the main determinants for selection of the lysine to construct Ub chains, which thereby directly control the cellular fate of the substrate. The UbcH5 family (UbcH5a, UbcH5b/UbcH4 and UbcH5c) have been shown to be the most active class of E2 enzymes in cell extracts and are associated with the regulation of a number of proteins associated with cell signalling, including p53, IκBα and β-catenin.

Ubiquitination Cascade Comoponent: E2

Active, full length, recombinant human UbcH4. N-terminal HA, 6His-tagged. For use in Enzyme Assays. Functions as an E2 enzyme in ubiquitination assays.

Purified using immobilized metal affinity chromatography.

For Specific Activity data, refer to the Certificate of Analysis for individual lots of this enzyme.

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