Recombinant Human Antibody (65C6) is capable of binding to IAV HA, expressed in HEK 293 cells. Expressed as the combination of a heavy chain (HC) containing VH from anti-IAV HA mAb and CH1-3 region of human IgG1 and a light chain (LC) encoding VL from anti-IAV HA mAb and CL of human kappa light chain. Exists as a disulfide linked dimer of the HC and LC hetero-dimer under non-reducing condition.
Figure 1 Bound antibodies 65C6 and 100F4 are internalized and block low-pH-induced fusion.
(C) Blockage of low-pH-triggered, wild-type H5 HA-mediated fusion by antibodies 65C6 and 100F4 but not PG16 control. Mean and standard deviation of fusion percentage in each image is shown below. (D) Blockage of low-pH-triggered, escape A of H5 HA-mediated fusion by antibody 65C6 but not by antibody 100F4 and PG16 control.
Qian, M., Hu, H., Zuo, T., Wang, G., Zhang, L., & Zhou, P. (2013). Unraveling of a neutralization mechanism by two human antibodies against conserved epitopes in the globular head of H5 hemagglutinin. Journal of virology, 87(6), 3571-3577.
Figure 2 Neutralization activity against H5N1 pseudotype A/Shenzhen/406H/06 by indicated concentrations of antibodies 65C6, 100F4, AVIg03, F10, and PG16. The neutralization activity was calculated as follows: relative luciferase activity (RLA) of pseudotype with a given concentration of an antibody/RLA of pseudotype alone without antibodies.
Qian, M., Hu, H., Zuo, T., Wang, G., Zhang, L., & Zhou, P. (2013). Unraveling of a neutralization mechanism by two human antibodies against conserved epitopes in the globular head of H5 hemagglutinin. Journal of virology, 87(6), 3571-3577.
Figure 3 (B) Effects of indicated concentrations of antibodies 65C6, 100F4, AVIg03, F10, and PG16 on binding of H5N1 pseudotype. A/Shenzhen/406H/06 to MDCK cells compared to binding of pseudotype alone (without antibodies). (C) Effects of indicated concentrations of antibodies 65C6, 100F4, AVIg03, F10, and PG16 on postattachment entry of H5N1 pseudotype A/Shenzhen/406H/06 into MDCK cells compared to entry of pseudotype alone (without antibodies).
Qian, M., Hu, H., Zuo, T., Wang, G., Zhang, L., & Zhou, P. (2013). Unraveling of a neutralization mechanism by two human antibodies against conserved epitopes in the globular head of H5 hemagglutinin. Journal of virology, 87(6), 3571-3577.
Figure 4 (D) Effects of antibodies 65C6, 100F4, AVIg03, F10, and PG16 on pH 5.0-triggered, HA-mediated cell-cell fusion among influenza H5 HA-transduced HeLa cells. (E) Mean and standard deviation of fusion percentages in each image in panel D.
Qian, M., Hu, H., Zuo, T., Wang, G., Zhang, L., & Zhou, P. (2013). Unraveling of a neutralization mechanism by two human antibodies against conserved epitopes in the globular head of H5 hemagglutinin. Journal of virology, 87(6), 3571-3577.
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