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Ubiquitin becomes ubiquitous in cancer: emerging roles of ubiquitin ligases and deubiquitinases in tumorigenesis and as therapeutic targets Shi D; Grossman SRCancer Biol Ther 2010[Oct]; 10 (8): 737-47By virtue of its ability to regulate both protein turnover and non-proteolytic signalling functions, ubiquitin protein conjugation has been implicated in the control of multiple cellular processes, including protein localization, cell cycle control, transcription regulation, DNA damage repair, and endocytosis. Ubiquitin metabolism enzymes have been identified as either oncogenes or tumor suppressors in a variety of cancers. Given that ubiquitin metabolism is governed by enzymes--E1, E2, E3, E4, deubiquitinases (DUBs), and the proteasome- the system as a whole is ripe for target and drug discovery in cancer. Of the ubiquitin/proteasome system components, the E3's and DUBs can recognize substrates with the most specificity, and are thus of key interest as drug targets in cancer. This review examines the molecular role in cancer, relevant substrates, and potential for pharmacologic development, of E3's and DUBs that have been associated thus far with human malignancies as oncogenes or tumor suppressors.|Humans[MESH]|Models, Biological[MESH]|Neoplasms/enzymology/*metabolism[MESH]|Proteasome Endopeptidase Complex/metabolism[MESH]|Signal Transduction[MESH]|Substrate Specificity[MESH]|Ubiquitin Thiolesterase/*metabolism[MESH]|Ubiquitin-Protein Ligases/*metabolism[MESH]|Ubiquitin-Specific Peptidase 7[MESH]|Ubiquitin/*metabolism[MESH] |