CIC bioGUNE 1 article published in JoVE Biochemistry SUMO-Binding Entities (SUBEs) as Tools for the Enrichment, Isolation, Identification, and Characterization of the SUMO Proteome in Liver Cancer Fernando Lopitz-Otsoa1, Teresa C Delgado1, Sofía Lachiondo-Ortega1, Mikel Azkargorta2, Felix Elortza2, Manuel S Rodríguez3, María Luz Martínez-Chantar1 1Liver Disease and Liver Metabolism Lab, CIC bioGUNE, Centro de Investigación Biomédica en Red de Enfermedades Hepáticas y Digestivas (CIBERehd), 2Proteomics Platforms, CIC bioGUNE, ProteoRED-ISCIII, CIBERehd, 3Advanced Technology Institute in Life Sciences (ITAV)-CNRS-IPBS, UbiCARE Here, we present a protocol to enrich, isolate, identify, and characterize proteins modified by SUMO in vivo both from human hepatoma cells and liver tumors obtained from mouse models of hepatocellular carcinoma by using SUMO-binding entities (SUBEs).