Fig. 5.

Env glycosylation. (A and B) Glycan-associated densities on the gp120 surface, viewed from two perspectives parallel to the viral membrane. The gp120 outer domain ribbon is colored blue and the asparagine residues associated with potential N-linked glycosylation sites are shown in Corey-Pauling-Koltun (CPK) representation and labeled. The blue meshwork shows the overall map segment associated with the gp120 outer domain. The yellow densities highlight the potential glycan-associated map segments in a surface representation. (C) Schematic showing the five glycan core residues associated with N-linked glycosylation. The trimannosyl core, which is common to high-mannose, complex, and hybrid oligosaccharides, is colored.