Ubch9 conjugates SUMO but not ubiquitin.

FEBS letters (1997-12-31)
J M Desterro, J Thomson, R T Hay
ABSTRACT

Ubiquitin conjugating enzymes participate in the thioester cascade that leads to protein ubiquitination. Although Ubc9 is homologous to E2 ubiquitin conjugating enzymes we have shown that it is unable to form a thioester with ubiquitin, but can form a thioester with the small ubiquitin-like protein SUMO. Thus Ubc9 is a SUMO conjugating enzyme rather than a ubiquitin conjugating enzyme. Transacetylation of Ubc9 by SUMO is not mediated by the E1 ubiquitin activating enzyme, but by a distinct enzymatic activity. SUMO conjugation to target proteins is mediated by a different, but parallel pathway to ubiquitination.

MATERIALS
Product Number
Brand
Product Description

Sigma-Aldrich
SUMO-1 human, ≥95% (SDS-PAGE), recombinant, expressed in E. coli (GST-tagged)
Sigma-Aldrich
UbcH9 Conjugating Enzyme human, ≥95% (SDS-PAGE), recombinant, expressed in E. coli, buffered aqueous glycerol solution

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