Porcine epidemic diarrhea virus manipulates IMPDH-dependent nucleotide biosynthesis to facilitate replication

PEDV poses a major global threat to swine health. This study uncovers a key mechanism of pathogenesis: PEDV exploits host nucleotide metabolism, inducing significant reprogramming with emphasis on purine biosynthesis. Comparative infection of porcine (LLC-PK1) and primate (Vero E6) cells revealed cell-specific metabolic adaptations. Crucially, we identify inosine monophosphate dehydrogenase (IMPDH), the rate-limiting enzyme for guanosine biosynthesis, as an essential host dependency factor for PEDV replication. Inhibiting IMPDH genetically or pharmacologically significantly reduced viral titers, validating it as a critical vulnerability. These findings reveal a novel mechanism by which PEDV hijacks host metabolism and establishes IMPDH as a promising host-directed therapeutic target for combating this economically devastating virus.