Human metapneumovirus small hydrophobic protein (HMPV SH)

The Human metapneumovirus (HMPV) small hydrophobic (SH) protein is a type II transmembrane protein that functions as a viroporin, forming pentameric ion channels in the host cell membrane (Laghlali et al., 2020). Although it is not strictly required for viral replication in vitro, it serves as a critical virulence factor by modulating host cell signaling and immune responses (Bao et al., 2008). Specifically, the SH protein has been shown to inhibit the NF-kappaB pathway, which suppresses the induction of pro-inflammatory cytokines and type I interferons, thereby facilitating immune evasion (Bao et al., 2008). Additionally, it plays a role in preventing premature apoptosis in infected cells, allowing for more efficient viral persistence and spread (Bi-Hung Peng et al., 2009). Because its deletion leads to significant viral attenuation in animal models, the SH protein is a primary focus for the design of live-attenuated vaccines (UniProt P0C2Z6). While no specific small-molecule inhibitors are currently approved for clinical use, the protein's ion channel activity presents a potential target for novel antiviral therapies using viroporin blockers (Laghlali et al., 2020).

Other names

SH proteinSmall hydrophobic proteinHMPV SH proteinViroporin SH

Inhibition of viral ion channel activity (viroporin function) and restoration of host innate immune signaling pathways.