Bifunctional hetero di-disc for broad-spectrum influenza neutralization

Nanodiscs containing sialic acid, which binds the hemagglutinin of the influenza virus, rupture the viral envelope and entrap viral ribonucleoproteins in the endolysosome. While nanodiscs are potent antiviral platforms, ganglioside GD1a containing α2,3-sialic acid does not cover all virus strains. When two nanodiscs containing different receptors 6′-sialyllactose and GD1a were mixed, one nanodisc inhibited the function of the other. A nanodisc loaded with two different receptors exhibited a biased activity toward only one receptor precluding the generation of a multifunctional nanodisc. Here, we suggest hetero di-disc, in which two nanodiscs loaded with each receptor were conjugated through protein trans-splicing for a broad-spectrum antiviral. The hetero di-disc showed strong antiviral activity in vitro and in vivo. Our results suggested that hetero di-discs not only expanded the inhibitory spectrum of nanodiscs but also enabled nanodisc-based delivery of multiple ligands without interference.