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Table 4 Apparent affinities of clones from D5-Lib-II selection against 5-Helix

From: Side chain requirements for affinity and specificity in D5, an HIV-1 antibody derived from the VH1-69 germline segment

  On-phage (bivalent) Off-phage (monovalent)
Clone IC50for 5-HelixA/nM IC50for 6-Helix-FdA/nM IC50for 5-HelixA/nM IC50for 6-Helix-FdA/nM
D5 WT 0.1 (0.07-0.1) 11 (8–15) 7.3 (5.3-10) 290
25B8 3.1 (1.8-5.3) ~100 NDB NDB
25C10 1.8 (1.3-2.7) 28 (21–37) 56 (40–79) NC C
25D8 5.8 (4.2-7.5) ~3000 NDB NDB
25A10 1.6 (1.3-2.0) 260 (150–450) 5.4 (3.8-7.7) ~500
25D9 1.7 (1.4-2.1) 230 (150–360) NDB NDB
25G8 7.2 (4.2-12.3) 300 (120–750) NDB NDB
25C6 32 (24–44) ~1000 NDB NDB
25C12 100 (31–300) ~1000 NDB NDB
25D6 0.5 (0.3-0.8) ~80 NDB NDB
25D3 17 (9.9-30) 170 (70–390) NDB NDB
25F1 0.9 (0.7-1.2) 40 (20–79) NDB NDB
25B6 0.3 (0.2-0.4) 23 (15–36) 0.6 (0.3-1.0) 94 (56–160)
25F10 0.2 (0.2-0.3) 22 (16–30) NDB NDB
25A12 2.2 (1.2-4.0) 220 (70–670) 34 (23–52) 280 (120–640)
  1. A 95% Confidence intervals from data fitting are shown in parentheses.
  2. B ND, not determined.
  3. CNC, no convergence observed upon data fitting, suggesting weak or insignificant binding.