protein tag, ubiquitin-like protein modifier, protein tagging activity, ubiquitin, covalent modifier
Alternate IDs
None
Definition
A molecular function exhibited by a protein that is covalently attached (AKA tagged or conjugated) to another protein where it acts as a marker, recognized by the cellular apparatus to target the tagged protein for some cellular process such as modification, sequestration, transport or degradation.
Source:PMID:19028679,
PMID:20054389,
PMID:6305978,
GOC:dos
Comment
Use this term to annotate conjugated tags, not for conjugating enzymes. At the time of writing, all known gene products with this activity are ubiquitin-like, either based on overall sequence similarity or the presence of common motifs and structures.