Tags: Protein.
Ubiquitin is a small (8.5 kDa) regulatory protein that has been found in almost all tissues (ubiquitously) of eukaryotic organisms. It was discovered in 1975 by Goldstein and further characterized throughout the 1970s and 1980s. There are four genes in the human genome that produce ubiquitin; UBB UBC UBA52 and RPS27A.Ubiquitination is a post-translational modification (an addition to a protein after it has been made) where ubiquitin is attached to a substrate protein.
