Catalog number: SBB-TR0051-2K, 2000 wellsMixture of Europium Cryptate Ubiquitin (SBB-TR0014), Cy5-Ubiquitin (SBB-TR0015), and wild-type Ubiquitin (SBB-UP0013) combined in a ratio optimized for TR-FRET based conjugation experiments where long polyubiquitin chains are formed. Conjugation reactions are monitored at Excitation = 304 nm, Emission channel 1 = 620 nm, Emission channel 2 = 665 nm. These proteins were expressed in E.coli.