Abstract
The ubiquitin-proteasome system is a crucial mechanism for regulating protein levels in cells, with substrate-specific E3 ubiquitin ligases serving as an integral component of this system. Among these ligases are SMAD-specific E3 ubiquitin-protein ligase 1 (SMURF1) and SMAD-specific E3 ubiquitin-protein ligase 2 (SMURF2), which belong to the neural precursor cell-expressed developmentally downregulated 4 (NEDD4) subfamily of Homologous to E6-AP COOH terminus (HECT)-type E3 ligases. As E3 ligases, SMURFs have critical functions in regulating the stability of multiple proteins, thereby maintaining physiological processes such as cell migration, proliferation, and apoptosis. The occurrence of many diseases is attributed to abnormal cell physiology and an imbalance in cell homeostasis. It is noteworthy that SMURFs play pivotal roles in disease progression, with the regulatory functions being complex and either facilitative or inhibitory. In this review, we elucidate the mechanisms by which SMURF1 and SMURF2 can regulate disease progression in non-cancerous diseases. These significant findings offer potential novel therapeutic targets for various diseases and new avenues for research on SMURF proteins.
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