Pek Ieong, Rommie E. Amaro, Wilfred W. Li Biophysical Journal

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Molecular Dynamics Analysis of Antibody Recognition and Escape by Human H1N1 Influenza Hemagglutinin Pek Ieong, Rommie E. Amaro, Wilfred W. Li Biophysical Journal Volume 108, Issue 11, Pages 2704-2712 (June 2015) DOI: 10.1016/j.bpj.2015.04.025 Copyright © 2015 Biophysical Society Terms and Conditions

Figure 1 Sequence alignment and the epitopes of the four HA glycoprotein. (A) Sequence alignment and structural view. The four HA sequences are aligned and numbered using the 18HA numbering convention. On the right, the Sa epitope is colored red and the surrounding residues that form contact with Ig-2D1 (12) are colored blue (top left) in 18HA monomer 1. (B) Structural conservation of the HA epitope region and key mutations that affect antibody recognition. The four HAs are shown: (a) 18HA, (b) 06HA, (c) 09HA, and (d) 09HA_mut. The epitope residues on monomer 1 are colored by residue names. Several key residues are also labeled to their corresponding residue colors. S160 (18HA) is mutated in N160 in 09HA. K 167 (09HA) is mutated to E167 in 09HA_mut. N129 and N164 in 06HA are potential glycosylation sites. To see this figure in color, go online. Biophysical Journal 2015 108, 2704-2712DOI: (10.1016/j.bpj.2015.04.025) Copyright © 2015 Biophysical Society Terms and Conditions

Figure 2 Loop motions near Glu 167 in 09HA_mut. (A) The position of Glu (E) 167 relative to the CDR L3 loop (yellow), at the beginning of the simulation. (B) After the end of the simulation, the loops moved away from the HA and the CDR L3 (orange) was further away from the Glu167. (C) The number of Ig-2D1 atoms (y axis) within 4.6 Å of K167 (09HA, red) and E167 (09HA_mut, black) over time (x axis). To see this figure in color, go online. Biophysical Journal 2015 108, 2704-2712DOI: (10.1016/j.bpj.2015.04.025) Copyright © 2015 Biophysical Society Terms and Conditions

Figure 3 The free energy differences squared are shown for all epitope residues between 18HA and 09HA. Y axis is the energy difference squared, ΔΔG2=(ΔG18HA−ΔG09HA)2, and x axis are the residue name and residue ID from 18HA. The two mutations are S160N and V170I from 18HA to 09HA. Detailed data may be found in Tables 3 and S8. Biophysical Journal 2015 108, 2704-2712DOI: (10.1016/j.bpj.2015.04.025) Copyright © 2015 Biophysical Society Terms and Conditions

Figure 4 The S160N mutation and water pocket formation. The number of water molecules within 5 Å of 18HA S160 (black) and 09HA N160 (red) as a function of simulation time. To see this figure in color, go online. Biophysical Journal 2015 108, 2704-2712DOI: (10.1016/j.bpj.2015.04.025) Copyright © 2015 Biophysical Society Terms and Conditions