Description
Ubiquitination,onetypeofthemostcommonpost-translationalmodification,mediatestheregulationofproteinhomeostasisinvivo.SinceubiquitinitselfcontainsmultiplelysineresiduesandoneN-terminalfreeaminogroup,eighttypesofubiquitinchainscanbeformed.? K63-linked polyubiquitin chains exert nonproteolytic functions in vivo, such as protein trafficking, kinase/phosphatase activation, and DNA damage control, all of which might be important in regulation of cancer survival and development (PMID: 19217402,PMCID: PMC3008764).