Regulation of cell functions by deubiquitinating enzymes

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1) Deubiquitinating enzyme USP18 was implicated in the protection of cells from the toxicity of non-native defective proteins by sequestering them to the aggresome in human cells.2) Small molecules that bind to the nucleolar localization signal of deubiquitinating enzyme USP36 were identified and were shown to inhibit the nucleolar localization as well as the function of USP36 in human cells. 3) The ubiquitin-interacting motifs (UIMs) in USP37 were shown to play a role in increasing the isopeptidase activity of USP37 toward ubiquitin chains by binding to the ubiquitin chains and stably positioning them in close proximity to the catalytic core of USP37.