Viral envelope glycoprotein high-mannose glycan

High-mannose glycans are a form of N-linked oligosaccharides, characterized by a core structure of mannose residues, that are attached to asparagine residues of viral envelope glycoproteins during post-translational processing[2][3][4]. In many enveloped viruses, such as HIV-1, these high-mannose glycans form dense clusters—sometimes dubbed the "mannose patch"—on the viral surface proteins (e.g., gp120 in HIV), which are not further processed to complex-type glycans due to steric hindrance[2]. This dense glycan shield plays dual roles in protecting the virus from immune recognition (antibody evasion) and facilitating host cell entry through receptor interactions[1][3]. High-mannose glycans are recognized by certain innate immune lectins and, importantly, are targeted by several broadly neutralizing antibodies (e.g., 2G12 in HIV) and experimental carbohydrate-binding antivirals[1][5][6]. The presence, density, and accessibility of these high-mannose structures are exploited for antiviral strategies, vaccine design, and as biomarkers for sensitive viral strains[5][6][1].

Other names

High-mannose glycanOligomannose glycanMannose patchHigh-mannose clusterHigh-mannose N-glycan epitope

Blockade of viral entry: By direct binding to high-mannose glycans, agents can prevent virus attachment/fusion with host cells. Immune unmasking: Forced virus evolution to delete glycans, exposing underlying viral protein epitopes and increasing susceptibility to the host immune system and neutralizing antibodies. Direct neutralization: Antibodies bind densely arrayed mannose residues, neutralizing the virus.