ubiquitin-ubiquitin ligase activity
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.
GO:0061630
ubiquitin protein ligase activity
is_a
E4
exact
SPAC20H4.10 SPAC11G7.02