The envelope is comprised of phospholipids and glycoprotein and for most viruses, is derived from host cell membranes.Virus particles comprise the viral genome packaged in a protein coat called the capsid.For certain viruses, the capsid is surrounded by a lipid bilayer that contains viral proteins, usually including the proteins that enable the virus to bind to the host cells.This lipid and protein structure is known as the virus envelope.ind out more here. The envelope is comprised of phospholipids and glycoprotein and for most viruses, is derived from host cell membranes. Virus particles comprise the viral genome packaged in a protein coat called the capsid.