Smurf2 Recombinant Rabbit mAb (S-4815-23)

Smurf2 (SMAD-specific E3 ubiquitin protein ligase 2) is a key HECT-type E3 ubiquitin ligase of the NEDD4 family, playing a central role as a "molecular switch" in cellular signaling regulation and homeostasis maintenance. Its structure features distinctive modular architecture: the N-terminal C2 domain mediates membrane binding and can interact with its own HECT catalytic domain to achieve auto-inhibition, preventing excessive enzyme activation; the central three WW domains are responsible for recognizing and binding to specific motifs on substrates or adaptor proteins (such as Smad7); and the C-terminal HECT catalytic domain contains a critical active-site cysteine (Cys716) that executes the transfer of ubiquitin from the E2 enzyme to the substrate. Functionally, the most core role of Smurf2 is negative regulation of the TGF-β/BMP signaling pathway: it forms a complex with Smad7 to target TGF-β type I receptors and receptor-regulated Smad proteins (Smad1/2/3) for ubiquitination and degradation, thereby effectively suppressing signal transduction of this pathway. Additionally, Smurf2 participates in ferroptosis activation (through mediating GSTP1 degradation), positive regulation of the Hedgehog signaling pathway, and various other biological processes. Its substrate spectrum is remarkably broad, including RUNX2, EZH2, RNF20, and others, thereby affecting osteogenic differentiation, cellular senescence, genomic stability, and multiple other aspects. In terms of disease association, Smurf2 exhibits a dual role: it can act as a tumor suppressor (by maintaining RNF20-mediated genomic stability) but may also promote tumorigenesis under specific contexts (such as enhancing colorectal cancer cell migration). Smurf2 dysfunction is closely associated with the development of diffuse large B-cell lymphoma, and mouse model studies have confirmed that its knockout is linked to increased tumor incidence and delayed cellular senescence.