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Category:GO:0034450 ! ubiquitin-ubiquitin ligase activity
name: ubiquitin-ubiquitin ligase activity
namespace: molecular_function
def: "Isoenergetic transfer of ubiquitin from one protein to an existing ubiquitin chain via the reaction X-ubiquitin + Y-ubiquitin = Y-ubiquitin-ubiquitin + X, where both the X-ubiquitin and Y-ubiquitin-ubiquitin linkages are thioester bonds between the C-terminal glycine of ubiquitin and a sulfhydryl side group of a cysteine residue." [GOC:mah, GOC:mcc, PMID:10089879, PMID:17190603]
synonym: "E4" EXACT []
is_a: GO:0061630 ! ubiquitin protein ligase activity
AmiGO
<GOterm>GO:0034450</GOterm>
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