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A) The CD4:gp120:17b structure (1GC1)13 in blue, yellow, and light grey, respectively. The Phe43 side chain, blue, emanates from the CD4 β-turn. A second critical CD4-gp120 interaction between Asp368gp120 and Arg59CD4 is highlighted in red and green, respectively. B) The NBD-556:gp120 structure (3TGS)15 with similar orientation as 1A. The surface of the Phe43 cavity is drawn in yellow with NBD-556 in orange. C) NBD-556 (1) and TS-II-224 (2).
