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The covalent modification of cellular factors by the small ubiquitin-like modifier (SUMO) has emerged as a key regulatory pathway for many biological processes. One recent advance in the field of SUMO modification that has provided important insights into SUMO-mediated regulatory networks is the ability to use proteomic mass spectrometry to identify the substrates of SUMO modification as well as their sites of conjugation (
1
–
10
). In this chapter, we describe a global strategy for affinity purifying and identifying a broad spectrum of SUMO-conjugated proteins and a focused approach for purifying a selected SUMO target and mapping its SUMO attachment site(s). Although both methods were initially developed for use in
S. cerevisiae
, they can be readily adapted to study the SUMO pathway in higher eukaryotes.
