[(Nε-biotinyl)Lys6]Ubiquitin Product Specification Application: Specifically biotinylated ubiquitin is useful for studying ubiquitinylation in vitro, and for detection and purification of ubiquitinylated substrates1. This biotinylated ubiquitin species2 is activated by E1 and is a competent substrate for the E2 and E3 enzymes. Long Term Storage: -20°C