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CH25H has received significant attention due to its broad antiviral activity, which it mediates by catalyzing the production of 25HC. Most studies have focused on the antiviral mechanisms of CH25H; however, whether viruses also actively regulate CH25H expression has not yet been reported. Previous studies demonstrated that pCH25H inhibits PRRSV replication not only via production of 25HC but also by ubiquitination and degradation of viral nonstructural protein 1α. In this study, we expanded on previous work and found that PRRSV actively degrades pCH25H through the ubiquitin-proteasome pathway. PRRSV E protein, a viral structural protein, is involved in this process. This study reveals a novel mechanism of interaction between virus and host during PRRSV infection.

Porcine Reproductive and Respiratory Syndrome Virus E Protein Degrades Porcine Cholesterol 25-Hydroxylase via the Ubiquitin-Proteasome Pathway