OBO ID: GO:0031386

Term Name:	protein tag activity		Search Ontology:
Synonyms:	covalent modifier protein tag protein tagging activity ubiquitin ubiquitin-like protein modifier
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. (3)
References:
Ontology:	GO: Molecular Function    QuickGO    AmiGO