name: protein tag
def: "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." [GOC:dos, GOC:go_curators, PMID:19028679, PMID:20054389, PMID:6305978]
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.
synonym: "covalent modifier" RELATED [GOC:vw]
synonym: "protein tagging activity" RELATED 
synonym: "ubiquitin" RELATED 
synonym: "ubiquitin-like protein modifier" EXACT 
is_a: GO:0003674 ! molecular_function
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Pages in category "GO:0031386 ! protein tag"
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