Small hydrophobic protein of Respiratory Syncytial Virus subtype A (SH protein (RSV-A))

The small hydrophobic protein (SH) of Respiratory Syncytial Virus (RSV) subtype A is a minor surface glycoprotein encoded within the viral genome, consisting of approximately 64 amino acids in subgroup A[1][2]. It is a type II transmembrane protein with its ectodomain oriented extracellularly, concentrated at lipid rafts in the host cell membrane and the Golgi complex, and is only minimally present in the viral envelope[1][6]. The SH protein forms pentameric structures that function as ion channels (viroporins), potentially influencing membrane permeability and inhibiting host cell apoptosis, likely through TNF-α signaling inhibition[2][4][5]. Although non-essential for viral replication in vitro, deletion of the SH gene results in attenuation of RSV in animal models, supporting its role in pathogenesis but not viral entry or syncytium formation[1][2][3]. The full biological role of the SH protein remains partially characterized, and it is a less-established antiviral target compared to the fusion (F) and attachment (G) proteins of RSV[4].

Other names

SH proteinRSV SHSmall hydrophobic protein (RSV-A)Viroporin protein

(For theoretical inhibitors): Block SH-mediated ion channel/viroporin activity, destabilize viral assembly, or promote apoptosis in infected cells; experimental Inhibition of TNF-α pathway modulation None clinically validated