Catalog number: SBB-TR0016, 50 μgHighly purified recombinant protein, which has been labeled with a single fluorescein (6-FAM) moiety at a specific site that keeps all lysines within the protein available and has a functional C-terminus.  Allows for conjugation into ubiquitin chains and does not affect or impair the E1 – E2 and E3 conjugation cascade. 6-FAM Ubiquitin has an excitation maximum Ex494nm and an emission maximum Em520nm.This protein was expressed in E.coli.[1][2][3]