Updated project metadata. Associated to PXD009877 which contains Part I and Part II. Part III – Pevonedistat/MLN4924 and Bortezomib treatment of the SI-NET (small intestinal – neuroendocrine tumor) cell line CNDT2. High Resolution Isoelectric Focusing (HiRIEF) LC-MS and relative quantification by TMT 10-plex was used to analyze cellular response to the proteasome inhibitor Bortezomib alone or in combination with the neddylation inhibitor pevonedistat (MLN4924) at 12h after treatment in the CNDT2 cell line. The data was obtained from one TMT 10-plex experiment which included 4 untreated controls (TMT channels 126, 127N, 127C and 128N), 3 samples treated with 500 nM Bortezomib for 12 hours (TMT channels 128C, 129N and 129C) as well as 3 samples treated with both Bortezomib and Pevonedistat at 500 nM respectively for 12 hours (TMT channels 130N, 130C and 131).