Expression, purification, and properties of the Ubc4/5 family of E2 enzymes - PubMed (original) (raw)

Expression, purification, and properties of the Ubc4/5 family of E2 enzymes

Kevin L Lorick et al. Methods Enzymol. 2005.

Abstract

Ubiquitin-conjugating enzymes (E2s) play a central role in ubiquitylation. They function to bridge the first, nonspecific step of ubiquitin activation by E1 with the transfer of activated ubiquitin to substrates by substrate-specific E3s. While sharing a common core UBC domain, members of this family exhibit significant specificity in their physical and functional interactions with E3s. Among the families of E2s, members of the yeast Ubc4/5 family are particularly well conserved in higher metazoans. In humans, these are represented by the UbcH5 family. Members of this ubiquitously expressed family show a capacity to interact with a wide range of E3s from both HECT and RING finger families, making them particularly useful tools in the laboratory. Using the UbcH5 family as a prototype, this chapter describes methods for the expression, purification, and characterization of E2 enzymes in vitro and some of the basics for their use in experiments in cells.

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