Blocking Lysine Crotonylation and Aerobic Glycolysis as Targeting Strategy Against mpox Virus Replication.

The global outbreak of mpox caused by the mpox virus (MPXV) in 2022 and 2024 underscores the urgent need to elucidate mechanisms governing viral replication during pathogenesis. Metabolic reprogramming is a conserved hallmark of viral infections, however, the precise mechanisms by which MPXV manipulates host cell metabolism remain unknown. Here, it is demonstrated that MPXV hijacks aerobic glycolysis via lysine crotonylation of its I3 protein, which is essential for MPXV replication. Mechanistically, MYST histone acetyltransferase 1 (MYST1), an acetyltransferase upregulated by MPXV, binds to and catalyzes the crotonylation of I3. The crotonylated I3 interacts with WD-repeat protein 26 (WDR26) to prevent its ubiquitination-dependent degradation, leading to enhanced aerobic glycolysis and promoting MPXV replication. Either pharmacological inhibition of MYST1 using MC4033 or blocking aerobic glycolysis with the glycolytic inhibitors 2-Deoxy-D-glucose (2-DG) or dichloroacetic acid (DCA) effectively suppresses MPXV replication. These findings uncover a novel crotonylation-dependent mechanism through which MPXV reprograms host metabolism to facilitate viral propagation, and identify lysine crotonylation and aerobic glycolysis as potential therapeutic targets against mpox.