AFM force measurements of the gp120-sCD4 and gp120 or CD4 antigen-antibody interactions |
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| Authors: | Chen Yong Zeng Gucheng Chen Sherry Shiyi Feng Qian Chen Zheng Wei |
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| Institution: | aInstitute for Advanced Study, Nanchang University, Nanchang, Jiangxi 330031, PR China;bDepartment of Microbiology and Immunology, University of Illinois at Chicago, Chicago, IL 60612, USA;cDepartment of Biomedical Engineering, Duke University, Durham, NC 27708, USA |
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| Abstract: | Soluble CD4 (sCD4), anti-CD4 antibody, and anti-gp120 antibody have long been regarded as entry inhibitors in human immunodeficiency virus (HIV) therapy. However, the interactions between these HIV entry inhibitors and corresponding target molecules are still poorly understood. In this study, atomic force microscopy (AFM) was utilized to investigate the interaction forces among them. We found that the unbinding forces of sCD4–gp120 interaction, CD4 antigen–antibody interaction, and gp120 antigen–antibody interaction were 25.45 ± 20.46, 51.22 ± 34.64, and 89.87 ± 44.63 pN, respectively, which may provide important mechanical information for understanding the effects of viral entry inhibitors on HIV infection. Moreover, we found that the functionalization of an interaction pair on AFM tip or substrate significantly influenced the results, implying that we must perform AFM force measurement and analyze the data with more caution. |
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| Keywords: | Atomic force microscopy (AFM) Human immunodeficiency virus (HIV) Entry inhibitor Soluble CD4 (sCD4) gp120 Neutralizing antibody |
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