1. Isolation of potent neutralizing antibodies from a survivor of the 2014 Ebola virus outbreak
by Zachary A. Bornholdt, Hannah L. Turner, Charles D. Murin, Wen Li, Devin Sok, Colby A. Souders, Ashley E. Piper, Arthur Goff, Joshua D. Shamblin, Suzanne E. Wollen, Thomas R. Sprague, Marnie L. Fusco, Kathleen B. J. Pommert, Lisa A. Cavacini, Heidi L. Smith, Mark Klempner, Keith A. Reimann, Eric Krauland, Tillman U. Gerngross, Karl D. Wittrup, Erica Ollmann Saphire, Dennis R. Burton, Pamela J. Glass, Andrew B. Ward, and Laura M. Walker
Science
Volume 351(6277):
March 4, 2016
Published by AAAS

2. Fig. 1 Antigen-binding properties of mAbs to GP.
Antigen-binding properties of mAbs to GP. (A) Apparent binding affinities of GP-specific IgGs to Zaire GPΔTM and Zaire GPΔmuc constructs as determined by BLI measurements. Newly discovered mAbs to GP are shown as red circles. KZ52 IgG (yellow diamond), 13C6 IgG (green triangle), 1H3 IgG (orange square), and 2G4 IgG (purple hexagon) are included for comparison. (B) Apparent binding affinities of GP-specific IgGs to Zaire sGP and Zaire GPΔmuc as determined by BLI measurements. (C) Pie chart summarizing antibody binding profiles. Cross-reactive mAbs refer to those that bind to both GP and sGP. N.B., nonbinder; W.B., weak binder. IgG equilibrium dissociation constants were calculated for mAbs with BLI responses >0.1 nm. MAbs with BLI responses <0.05 nm were designated as N.B.s; MAbs with BLI responses between 0.05 and 0.1 nm were designated as W.B.s. All data are representative of two or more independent experiments.
Zachary A. Bornholdt et al. Science 2016;351:
Published by AAAS

3. Fig. 2 Epitope mapping.
Epitope mapping. (A) Percentage of sGP-reactive and sGP–non-reactive mAbs directed against each antigenic site on EBOV GP. Epitope binning was performed using a previously described yeast-based competition assay (20). (B) Percentage of selected KZ52 competitors that cross-react with SUDV GP and BDBV GP. Binding cross-reactivity was assessed by enzyme-linked immunosorbent assay (ELISA). (C) ELISA binding of selected KZ52 competitors to a minimal GP core that contains deletions in the mucin-like domain and glycan cap (GPCL). ELISA binding is expressed as the optical density at 405 nm (OD405) reading at a concentration of 0.2 μg/ml. (D) Percentage of selected KZ52 noncompetitors that cross-react with SUDV GP and BDBV GP. Binding cross-reactivity was assessed by ELISA. (E) Summary of the antigenic sites targeted by the mAbs to GP. All data are representative of two or more independent experiments.
Zachary A. Bornholdt et al. Science 2016;351:
Published by AAAS

4. Fig. 3 Neutralizing activity of mAbs to GP.
Neutralizing activity of mAbs to GP. (A) Percentage of mAbs in each competition group that reached PRNT50 or PRNT80 at concentrations ≤50 μg/ml. The total number of mAbs tested from each competition group is shown at the top of the corresponding bar. (B) PRNT50 and PRNT80 values of selected mAbs from each competition group. KZ52 IgG is included for comparison (green inverted triangles). Red bars indicate median PRNT50 and PRNT80 values. Neutralization assays were performed using a live virus plaque reduction assay. PRNT50 and PRNT80 values represent the concentration of IgG required to reduce viral infectivity by 50 and 80%, respectively. All data are representative of two independent experiments.
Zachary A. Bornholdt et al. Science 2016;351:
Published by AAAS

5. Fig. 4 Negative-stain electron microscopy of Fab:EBOV GPΔTM complexes.
Negative-stain electron microscopy of Fab:EBOV GPΔTM complexes. (A) A structure-based (PDB 3CSY and 3S88) (5) surface representation of the EBOV GP trimer. The mucin domain (gray), glycan cap domain of GP1 (aqua green), GP1 core (blue), GP2 (light blue), fusion loop region of GP2 (pink), and the stalk/HR2 region (orange) have been mapped onto the structure. The residues that make up the trimeric body and the stalk region of the EBOV GP are displayed on the left. The mucin domains are modeled only as spheres, because they are largely unstructured and poorly defined (27). Residues 613 to 637 corresponding to the stalk/HR2 region were modeled in silico using threefold symmetry and peptide structure prediction for the HR2 region (28). (B) Corresponding 3D reconstructions of four Fab:EBOV GPΔTM complexes are shown in transparent surface representation (gray) with the model from (A) fitted in the density. Additionally, structural models for each Fab variable region were generated using the ROSIE server (29, 30) and then fitted into the density maps as surface representations. Each structure is shown as side (left) and top (right) views, with the exception of ADI-15758, which is shown from the bottom up, respective to the viral membrane.
Zachary A. Bornholdt et al. Science 2016;351:
Published by AAAS

6. Fig. 5 Therapeutic efficacy of NAbs against MA-EBOV.
Therapeutic efficacy of NAbs against MA-EBOV. Kaplan-Meier survival curves for ADI competitor NAbs (A), KZ52 competitor NAbs (B), 13C6 competitor NAbs (C), and NAbs targeting undefined epitopes (D). Mice were infected with 100 PFU of MA-EBOV and treated intraperitoneally with a single dose of the indicated mAbs at 2 dpi (dotted black line). Negative control mice were treated with phosphate-buffered saline. MAb 2G4 is included for comparison. Data are representative of one experiment with 10 mice per group.
Zachary A. Bornholdt et al. Science 2016;351:
Published by AAAS