Ubi-Trans(tm) UBE1-UbcH5b TR-FRET Assay Kit

BPS Bioscience

Ubi-Trans(tm) UBE1-UbcH5b TR-FRET Assay Kit

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Research Use Only

The Ubi-Trans™ UBE1-UbcH5b TR-FRET Assay Kit is a homogeneous, sensitive TR-FRET (Time-Resolved Fluorescence Resonance Energy Transfer) assay designed to measure UBE1 (ubiquitin- activating enzyme 1)-dependent transfer of Ub (ubiquitin) to UbcH5b (Ubiquitin-conjugating enzyme E2 D2) E2 enzyme. It utilizes a Terbium (Tb)-labeled donor and a dye-labeled streptavidin acceptor to complete the TR-FRET pairing. The kit comes in a convenient 384-well format and contains enough purified UbcH5b, purified UBE1, Biotin-Ubiquitin, anti-His Tb (terbium)-labeled donor, dye-labeled streptavidin acceptor, and assay buffer for 400 reactions. Figure 1: Ubi-Trans™ UBE1-UbcH5b TR-FRET Assay Kit schematic. In the presence of ATP, UBE1 transfers biotin-conjugated ubiquitin to the substrate UbcH5b (E2). The Tb-labeled anti-His antibody binds to the His-tagged E2 enzyme, while the dye-labeled streptavidin acceptor binds to Biotin-Ubiquitin. The complex forms when ubiquitin is transferred to the E2 enzyme by E1. In the absence of ubiquitination, the complex does not form and energy transfer does not occur. When E2 is ubiquitinated the complex is formed, TR-FRET pairing is complete, and an increase in acceptor emission is observed. Thus, TR-FRET signal is proportional to UBE1 activity.

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