Adjective
monoubiquitinated (not comparable)
Having one ubiquitin unit attached.
This protein is monoubiquitinated in response to DNA damage, resulting in its localization to nuclear foci with other proteins involved in homology-directed DNA repair.
Monoubiquitinated PCNA recruits polymerases that can carry out DNA synthesis with damaged DNA; but this is very error-prone, possibly resulting in the synthesis of mutated DNA. Source: Internet