Human metapneumovirus attachment glycoprotein (HMPV G)

The Human metapneumovirus (HMPV) attachment glycoprotein, or G protein, is a type II transmembrane surface protein essential for the initiation of viral infection. It facilitates the attachment of the virus to host cell receptors, primarily through interactions with glycosaminoglycans such as heparan sulfate on the surface of respiratory epithelial cells (UniProt P0C2Z6). The G protein is heavily glycosylated with both N-linked and O-linked sugars, which helps the virus evade host immune detection by masking antigenic sites and modulating the innate immune response, including the inhibition of type I interferon signaling (Bao et al., 2008, Journal of Virology). Structurally, it consists of an N-terminal cytoplasmic tail, a transmembrane domain, and a large, highly variable C-terminal extracellular domain. This high degree of sequence variability between HMPV lineages A and B makes the G protein a challenging target for universal vaccine development compared to the more conserved fusion (F) protein (Thiempanawong et al., 2021, Viruses). Nevertheless, it remains a critical target for understanding viral pathogenesis and is a key component in the study of HMPV-induced respiratory diseases like bronchiolitis and pneumonia, particularly in pediatric, elderly, and immunocompromised populations.

Other names

G proteinAttachment protein GHMPV G proteinMajor surface glycoprotein G

Neutralization of viral infectivity by blocking the attachment of the virus to host cell surface receptors, such as glycosaminoglycans, thereby preventing viral entry and subsequent replication.