Human Ubiquitin-Conjugating Enzyme E2 Variant 1 Protein is a recombinant protein from Human produced in E. coli. Recombinant Human Ubiquitin-Conjugating Enzyme E2 Variant 1 is produced by our E.coli expression system and the target gene encoding Ala2-Asn147 is expressed with a 6His tag at the C-terminus.