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Enveloped viruses require virus-cell membrane fusion to release the viral genome and replicate. The viral fusion protein triggers from the pre- to the postfusion conformation, an essentially irreversible change, to drive membrane fusion. We found that small proteins containing the TM and a limited flanking region homologous to the fusion protein of the zoonotic Hendra virus reduced protein expression and fusion activity. The introduction of exogenous TM peptides may displace a TM domain, disrupting native TM-TM interactions and globally destabilizing the fusion protein. Supporting this hypothesis, we showed that a sequence-specific transmembrane peptide dramatically reduced viral infection in another enveloped virus model, suggesting a broader inhibitory mechanism. Viral fusion protein TM-TM interactions are important for protein function, and disruption of these interactions dramatically reduces protein stability.

A Hydrophobic Target: Using the Paramyxovirus Fusion Protein Transmembrane Domain To Modulate Fusion Protein Stability