Human metapneumovirus fusion glycoprotein F (hMPV F)

Human metapneumovirus fusion glycoprotein F (hMPV F) is an envelope surface protein essential for the infectivity of human metapneumovirus (hMPV), a leading cause of respiratory illness in children, elderly, and immunocompromised individuals. The F protein orchestrates the merger of the viral and host cell membranes by transitioning from a metastable pre-fusion structure to a stable post-fusion shape. This conformational change exposes a hydrophobic fusion peptide that inserts into the host membrane, driving fusion and entry. The F protein is also the primary target of neutralizing antibodies and a critical antigen for vaccine design; it carries several neutralizing epitopes primarily in its pre-fusion form. In addition to facilitating membrane fusion, hMPV F participates in host cell attachment through interactions with cell-surface proteoglycans and integrins, notably via an RGD motif. Stabilization of the pre-fusion conformation is a central challenge for vaccine development because it presents the most protective epitopes. Experimental monoclonal antibodies (e.g., DS7, MPE8) and rationally designed vaccine antigens targeting the F protein have shown efficacy in eliciting protective immunity.

Other names

hMPV fusion proteinFusion glycoprotein F (sometimes written as "Metapneumovirus F protein," "F protein," or "Human metapneumovirus F glycoprotein")

Inhibition of membrane fusion by binding and blocking conformational transitions in hMPV F protein Neutralization of virus by targeting key epitopes on the F protein in pre-fusion and post-fusion conformations Preventing viral entry by interfering with F-mediated attachment or internalization