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• W2899363469 abstract "Experimental results for the antibody known as immunoglobulin G - IgG interacting with phenobarbital were obtained via atomic force microscopy (AFM) and thereafter investigated using computer simulation modeling tools. Using molecular dynamics simulation and docking calculations, the energetically stable configurations of an immobilized antibody over a silicon surface were searched. Six stable configurations of the immobilized antibody over the silicon nitride surface covered by linker molecules were found. Although, only three of them (P1, P2, P5) maintained the Fragment antigen binding available for antigen interaction. Therefore, these configurations were equilibrated after reaching 100 ns molecular dynamics trajectory. The average interaction energy between the surface and the immunoglobulin G - IgG antibody in the P1, P2 and P5 configurations were -62.4 ± 2.4 kcal/mol; -54.3 ± 5.7 kcal/mol, and -360.9 ± 4.2 kcal/mol respectively. Phenobarbital was docked within the Fab domain of P1, P2, and P5 immobilized configurations and equilibrated with molecular dynamics for binding energy estimation. Then, steered molecular dynamics was performed to evaluate unbinding energy pathway between phenobarbital and IgG in each of the three-oriented IgG configurations. No significant differences were observed in the rupture force values (EP1 = 591 ± 13 pN, EP2 = 605 ± 18 pN, and EP5 = 610 ± 45 pN). In comparison, the average AFM experimental results were (641.6 ± 363.3 pN). Therefore, it is worth noting that P5 is the configuration with highest protein-surface interaction. Therefore, the force value calculated for the P5 orientation is statistically more favorable and it is the one to be compared to the experimental data. The agreement between experimental and theoretical results indicates a favorable presented for this study opening new perspectives for antigen-antibody evaluation." @default.
• W2899363469 created "2018-11-09" @default.
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• W2899363469 date "2019-01-01" @default.
• W2899363469 modified "2023-10-18" @default.
• W2899363469 title "Immobilization and unbinding investigation of the antigen-antibody complex using theoretical and experimental techniques" @default.
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• W2899363469 doi "https://doi.org/10.1016/j.jmgm.2018.10.012" @default.
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• W2899363469 hasPublicationYear "2019" @default.
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