Thus, opening of the b12-bound Env trimer involves a rigid body movement of the?gp120-V1V2 unit such that the coreceptor binding site within the V3 loop remains largely buried, whereas the opening of gp120 subunits in sCD4-certain Envs includes repositioning of V1V2 to expose the V3 loop (Figure?2D)
Thus, opening of the b12-bound Env trimer involves a rigid body movement of the?gp120-V1V2 unit such that the coreceptor binding site within the V3 loop remains largely buried, whereas the opening of gp120 subunits in sCD4-certain Envs includes repositioning of V1V2 to expose the V3 loop (Figure?2D). compact gp41 central helix conformation, and (2) 4-stranded…