Abstract
The weak interaction between the post-translational modifier SUMO (small ubiquitin-like modifier) and proteins containing the SUMO-interacting motif (SIM) poses limitations to the identification of interaction partners of SUMOylated proteins and to the mapping of the interfaces. To overcome these limitations, genetically encoded photocrosslinker amino acids were incorporated close to the SIM-interaction groove in human SUMO1. UV irradiation resulted in the desired covalent crosslinks both in a purified protein environment and in cell extracts.
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