The invention relates to an immunogenic HIV-1 gp120 mini V3 loop, which is a truncated version of the full-length gp120 V3 loop useful for crystallization with antibodies that recognize carbohydrate moieties. The invention also relates to the structure of a broadly neutralizing antibody as a complex with a glycosylated gp120 outer domain, as determined by crystallographic techniques, and the confirmation that a glycosylated gp120 outer domain has a functional relevant conformation, as well as the determination of key residues on a glycosylated gp120 outer domain, and uses thereof and compounds and compositions therefrom. Furthermore, the invention also relates to other peptides and mimetic peptides, which bind to broadly neutralizing antibodies.
