– Attaches the virus to host cellular receptor, inducing clathrin-dependent endocytosis of the virion. In the endosome, the acidic pH induces conformational changes in the glycoprotein trimer, which trigger fusion between virus and endosomal membrane. VSIV (strain Mudd-Summers) Glycoprotein G Protein (His & Myc) is expressed in E. coli expression system with N-10xHis and C-Myc tag. The predicted molecular weight is 54.8 kDa and the accession number is P0C2X0.