USP11

USP11 (ubiquitin-specific peptidase 11) is an X-linked deubiquitinating enzyme of the ubiquitin-specific protease family that primarily regulates protein stability by removing ubiquitin chains from substrate proteins and thereby modulating protein turnover and signaling networks^[1]. Mechanistically, USP11 functions in chromatin regulation and the cellular DNA damage response, where it acts as a histone deubiquitinase that contributes to chromatin reorganization during DNA repair processes^[2]. Through these activities, USP11 participates in pathways controlling DNA double-strand break repair, cell-cycle progression, and signal transduction, highlighting its importance in maintaining genome integrity^[3]. In disease contexts, dysregulated USP11 activity has been linked to multiple cancer models, where stabilization of specific substrates can influence tumor growth, survival, and therapeutic responses^[1][3]. Compared with its closest paralogs, USP4 and USP15, USP11 belongs to the same DUSP-UBL domain-containing subfamily but exhibits distinct regulatory mechanisms and substrate specificity despite overall structural similarity, making isoform-selective investigation particularly important for mechanistic studies^[3]. This functional divergence has increased interest in USP11 as a research target for understanding deubiquitinase-dependent signaling pathways and disease biology^[1][3]. For experimental applications, peptide ligands that recognize a specific ubiquitin-like domain-binding site of USP11 have been developed, providing tools to interrogate USP11-specific molecular interactions^[4]. More recently, selective USP11 inhibitors have been reported, enabling pharmacological disruption of USP11-dependent signaling and supporting target-validation studies in cancer research models^[5].

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