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- W2046084246 abstract "Evaluation of antidiphtheria toxin nanobodies Ghada H ShakerDepartment of Microbiology and Immunology, Faculty of Pharmacy, King Saud University, Riyadh, Kingdom of Saudi ArabiaAbstract: Nanobodies are the smallest fragments of naturally occurring single-domain antibodies that have evolved to be fully functional in the absence of a light chain. Conventional antibodies are glycoproteins comprising two heavy and two light chains. Surprisingly, all members of the Camelidae family possess a fraction of antibodies devoid of both light chains and the first constant domain. These types of antibodies are known as heavy-chain antibody (HcAb) nanobodies. There are three subclasses of IgG in dromedaries, namely IgG1, IgG2, and IgG3 of which IgG2 and IgG3 are of the HcAb type. These heavy chain antibodies constitute approximately 50% of the IgG in llama serum and as much as 75% of the IgG in camel serum. In the present work, the different IgG subclasses from an immunized camel (Camelus dromedarius) with divalent diphtheria-tetanus vaccine were purified using their different affinity for protein A and protein G and their absorbance measured at 280 nm. Purity control and characterization by 12% sodium dodecyl sulfate-polyacrylamide gel electrophoresis of IgG subclasses was done under reducing conditions. Protein bands were visualized after staining with Coomassie Blue, showing two bands at 50 kDa and 30 kDa for IgG1, while IgG2 and IgG3 produced only one band at 46 kDa and 43 kDa, respectively. An enzyme-linked immunosorbent assay test using diphtheria toxin and purified IgG subclasses from the immunized camel were performed to evaluate their efficiency. Compared with conventional IgG1, heavy chain antibodies (nanobodies) were shown to be more efficient in binding to diphtheria toxin antigen. This study revealed the possibility of using IgG2 and IgG3 nanobodies as an effective antitoxin for the treatment of diphtheria in humans.Keywords: camel, heavy chain antibody, HcAb, nanobodies, immunoglobulin, IgG subclasses, diphtheria toxin" @default.
- W2046084246 created "2016-06-24" @default.
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- W2046084246 date "2010-06-01" @default.
- W2046084246 modified "2023-09-25" @default.
- W2046084246 title "Evaluation of antidiphtheria toxin nanobodies" @default.
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- W2046084246 doi "https://doi.org/10.2147/nsa.s9591" @default.
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