While the small ubiquitin-related modifier SUMO uses a conjugation and de-conjugation system closely related to that of ubiquitin itself, its functions are highly diverse and largely independent of the ubiquitin system. In SUMO Protocols, leading experts present a collection of methods intended to highlight important features unique to the biology of SUMO in order to support future SUMO research. The first half of the volume focuses on the identification and functional characterization of SUMO targets and interactors, while the second half covers essential biochemical methods for the manipulation of the enzymatic components of the SUMO system. Written in the highly successful Methods in Molecular Biologya" series format, the chapters include brief introductions to the subject, lists of the necessary materials and reagents, step-by-step, readily reproducible laboratory protocols, and the Notes sections, which provide tips on troubleshooting and avoiding known pitfalls. Unique and cutting-edge, SUMO Protocols provides the necessary tools for biochemists, molecular and cellular biologists as well as research-oriented clinicians not yet familiar with this vital system.