PPP1R11 is a dual-function protein that serves as both a protein phosphatase 1 inhibitor and an atypical E3 ubiquitin ligase. As a PP1 inhibitor, PPP1R11 forms inactive complexes with PP1γ2 in testicular germ cells and functions as a metal chaperone for PP1, facilitating Mn2+ incorporation 12. The protein exhibits tissue-specific expression patterns and plays critical roles in male fertility through regulation of sperm maturation, where its association with PP1γ2 changes during epididymal transit from caput to caudal sperm 3. As an E3 ubiquitin ligase, PPP1R11 directly ubiquitinates TLR2 at Lys-754, leading to proteasomal degradation and regulation of innate immune responses against gram-positive bacteria 4. In colorectal cancer, PPP1R11 is regulated by the p53-HIF1A-miR-34a axis and promotes epithelial-to-mesenchymal transition and metastasis through STAT3 activation 5. Additionally, PPP1R11 modulates T cell responses by negatively regulating cytokine expression and affecting susceptibility to regulatory T cell-mediated suppression 6. The protein also participates in Wnt signaling pathways that promote cilia biogenesis and beating 7.