Table 1

Representation of important ubiquitination core enzyme families in the human genome

Protein familyStructural domainsNo. of Refseq IDsNo. of HGNC proteins*
E1-activating enzymes Ubiquitin-activating domain40  
E2-conjugating enzymes UBC core domain41  78 43 
E3 ligases RING42  562 334 
 TRIAD43  33 22 
 HECT44  45 28 
 PHD45  290 173 
 U box46  42 31 
E3 complex formation SOCS box47  54 39 
Substrate recruitment F-box48  115 72 
 BTB49  273 188 
Proteasome complex  85 68 
DUB UCH, USP, OUT, Josephin, JAMM50  98 86 
Protein familyStructural domainsNo. of Refseq IDsNo. of HGNC proteins*
E1-activating enzymes Ubiquitin-activating domain40  
E2-conjugating enzymes UBC core domain41  78 43 
E3 ligases RING42  562 334 
 TRIAD43  33 22 
 HECT44  45 28 
 PHD45  290 173 
 U box46  42 31 
E3 complex formation SOCS box47  54 39 
Substrate recruitment F-box48  115 72 
 BTB49  273 188 
Proteasome complex  85 68 
DUB UCH, USP, OUT, Josephin, JAMM50  98 86 

DUB indicates deubiquitinating enzyme.

*

Number of proteins based on protein nomenclature by the HGNC:HUGO Gene Nomenclature Committee.

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