OBSOLETE. The cyclical process by which one or more ubiquitin groups are added to (ubiquitination) and removed from (deubiquitination) a protein.
Source:PMID:11917093
Comment
This term was made obsolete because it implies that every protein that is ubiquitinated is also subsequently deubiquinitated, which is not true. Also, the process ontology does not include analogous terms for other small modifiers.