ABSTRACT: We aimed to characterize changes within the SUMOylation pathway that are driven by the tRNA-like molecule mascRNA. For the experiments otulined below, we used 293FT cells (a derivative of HEK293T cells).First, we identified the SAE2-associating proteins. Sample IDs: 92072 NRS control, 92073 antiSAE2 IP. Secondly, we identified proteins pulled-down by biotinylated mascRNA and mascRNA-3'CCA, using scrambled mascRNA oligo as a control. Sample IDs: 92199: scrambled mascRNA-Biotin control; 92200: mascRNA3'biotinTEG; 92201: mascRNA-CCA3'biotinTEGThirdly, we verified the specificity of SUMO1 IPs, by comparing two beads elution approaches: 1) by SUMO1 competitive peptide elution (processed gel pieces). Sample IDS: 99699-99704: Proteomic analysis of SDS PAGE gel pieces for SUMO1 IP and control IgG IP. (Details below) 2) urea eluates from the SUMO1-IPs. Sample IDs: 99705 control Rabbit IgG IP; 99706 SUMO1 IP Lastly, we used urea eluates from SUMO1-IPs from cells transfected with 5’P-mascRNA vs. 5’Pscrambled RNA. Sample IDs: 100479, 100480, 100481: Triplicates (1A, 1B, 1C) of control IgG IP from cells treated with scrambled mascRNA oligo (control IP)100482, 100483, 100484: Triplicates (3A, 3B, 3C) of control IgG IP from cells treated with mascRNA oligo (control IP)100485, 100486, 100487: Triplicates (2A, 2B, 2C) of SUMO1 IP from cells treated with scrambled mascRNA oligo (control transfection)100488, 100489, 100490: Triplicates (4A, 4B, 4C) of SUMO1 IP from cells treated with mascRNA oligo Sample details can be found in the file named Experimental_Design_Proteomics_ELIAPI_2024.txt below.