Journal: The Journal of Biological Chemistry
Article Title: Characterization of the molecular mechanism of the autophagy-related Atg8–Atg3 protein interaction in Toxoplasma gondii
doi: 10.1074/jbc.RA118.002614
Figure Lengend Snippet: Identification of peptides containing a potential AIM sequence in TgAtg3 by AlphaScreen competition assay.
A, schematic of the AlphaScreen assay. Biotinylated TgAtg8 and His-tag TgAtg3 are immobilized on streptavidin-coated donor beads and nickel-chelated acceptor beads, respectively. Excitation of donor beads produces singlet oxygen. Interaction between TgAtg8 and TgAtg3 brings donor and acceptor beads into close proximity, allowing energy from singlet oxygen to be transferred to the acceptor beads and produce a light signal. Addition of untagged competitor peptides will reduce the signal intensity. B, competition for binding to biotinylated TgAtg8 domain by untagged peptides of TgAtg3. Each competitor was tested in triplicate, with a representative data set shown. IC50 values were calculated using a nonlinear regression analysis (sigmoidal dose–response fitting with variable slope (four parameters)) using GraphPad Prism 6.0 software. Data were obtained from one of four independent experiments.
Article Snippet: IC 50 values were calculated using a nonlinear regression analysis (sigmoidal dose–response fitting with variable slope (four parameters)) using GraphPad Prism 6.0 software.
Techniques: Sequencing, Amplified Luminescent Proximity Homogenous Assay, Competitive Binding Assay, Binding Assay, Software