We provide a robust protocol for the far-UV CD analysis of SUMO-2 protein and SUMO-2 core domain as well as all the data as supplementary files for those interested by the study of SUMO protein conformation.<br>These analyses were performed after having read the report published in 2014 by Grana-Montes, R. et al. (Grana-Montes, R.; Marinelli, P.; Reverter, D.; Ventura, S., N-terminal protein tails act as aggregation protective entropic bristles: the SUMO case. Biomacromolecules 2014, 15 (4), 1194-203. DOI: 10.1021/bm401776z).<br><br>