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Please use this identifier to cite or link to this item: http://hdl.handle.net/123456789/12369

Title: Characterization of a novel inhibitory human monoclonal antibody directed against Plasmodium falciparum Apical Membrane Antigen 1
Authors: Maskus, Dominika J.
Królik, Michał
Bethke, Susanne
Spiegel, Holger
Addai-Mensah, Otchere
et. al
Issue Date: 21-Dec-2016
Publisher: Nature Publishing Group
Citation: Maskus, D. J. et al. Characterization of a novel inhibitory human monoclonal antibody directed against Plasmodium falciparum Apical Membrane Antigen 1. Sci. Rep. 6, 39462; doi: 10.1038/srep39462 (2016).
Abstract: Malaria remains a major challenge to global health causing extensive morbidity and mortality. Yet, there is no efficient vaccine and the immune response remains incompletely understood. Apical Membrane Antigen 1 (AMA1), a leading vaccine candidate, plays a key role during merozoite invasion into erythrocytes by interacting with Rhoptry Neck Protein 2 (RON2). We generated a human antiAMA1-antibody (humAbAMA1) by EBV-transformation of sorted B-lymphocytes from a Ghanaian donor and subsequent rescue of antibody variable regions. The antibody was expressed in Nicotiana benthamiana and in HEK239-6E, characterized for binding specificity and epitope, and analyzed for its inhibitory effect on Plasmodium falciparum. The generated humAbAMA1 shows an affinity of 106–135 pM. It inhibits the parasite strain 3D7A growth in vitro with an expression system-independent IC50-value of 35μg/ml (95% confidence interval: 33μg/ml–37μg/ml), which is three to eight times lower than the IC50-values of inhibitory antibodies 4G2 and 1F9. The epitope was mapped to the close proximity of the RON2-peptide binding groove. Competition for binding between the RON2-peptide and humAbAMA1 was confirmed by surface plasmon resonance spectroscopy measurements. The particularly advantageous inhibitory activity of this fully human antibody might provide a basis for future therapeutic applications.
Description: An article published by Nature Publishing Group and also available at DOI: 10.1038/srep39462
URI: http://hdl.handle.net/123456789/12369
Appears in Collections:College of Health Sciences

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