KPC1 is an alias for the gene, Ring finger protein 123, in humans. Other names include: E3 ubiquitin-protein ligase RNF123; E3 ubiquitin-protein ligase RNF123 ; Kip1 ubiquitination-promoting complex protein 1; FP1477. The encoded protein is an enzyme with an amino acid length of 1314 and a mass of 148.5 kDa. Other isoforms may exist. This gene shares homology with other species, including: Mouse, Rat, Zebrafish, Frog, Chicken.