Lipid envelope of enveloped virus

The **lipid envelope of enveloped viruses** is a lipid bilayer membrane that surrounds the capsid of many virus families, including influenza, HIV, herpesviruses, and flaviviruses[3][1][5]. This envelope is acquired from host cell membranes (such as plasma membrane, ER, or Golgi) as viruses bud out, and is characterized by a unique composition differing from host membranes, often enriched in cholesterol and sphingolipids[1][3]. Embedded within this envelope are viral glycoproteins (e.g., HIV gp120/gp41, flavivirus E protein) that mediate binding to host receptors and catalyze fusion of the viral and host cell membranes, enabling viral entry into cells[1][2][4]. The envelope also plays a critical role in evading host immune responses by masking viral components with host-derived lipids and proteins[3]. The structural integrity of the envelope is essential for infectivity—its disruption (by detergents, alcohols, or fusion inhibitors) leads to loss of viral infectivity[1][3][8]. Because of these functions, the lipid envelope is a key therapeutic target in antiviral strategies, though its host origin and vulnerability to environmental stress pose challenges for targeted drug development[1][8].

Other names

Viral lipid envelopeVirus envelopeViral envelopeLipid bilayer envelope

Disruption of the lipid envelope (by detergents, alcohol, some pharmacologic agents)[8][3]; Inhibition of membrane fusion (fusion inhibitors block viral entry)[4]; Binding/inhibition of envelope glycoproteins (antibodies prevent fusion and entry)[4][2]