Abstract
With a growing number of high-throughput studies, structural analyses, and availability of protein-protein interaction databases, it is now possible to apply web-based prediction tools to SH2 domain-interactions. However, in silico prediction is not always reliable and requires experimental validation. Rosette assay is a dot blot-based reverse-phase assay developed for the assessment of binding between SH2 domains and their ligands. It is conveniently customizable, allowing for low- to high-throughput analysis of interactions between various numbers of SH2 domains and their ligands, e.g., short peptides, purified proteins, and cell lysates. The binding assay is performed in a 96-well plate (MBA or MWA apparatus) in which a sample spotted membrane is incubated with up to 96 labeled SH2 domains. Bound domains are detected and quantified using a chemiluminescence or near-infrared fluorescence (IR) imaging system. In this chapter, we describe a practical protocol for rosette assay to assess interactions between synthesized tyrosine phosphorylated peptides and a library of GST-tagged SH2 domains. Since the methodology is not confined to assessment of SH2–pTyr interactions, rosette assay can be broadly utilized for ligand and drug screening using different protein interaction domains or antibodies.
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Acknowledgments
We thank Joshua Jadwin for assistance with editing the chapter, and Bruce Mayer for his continuous encouragement and support. This study was partly supported by grant CA1154966 from the National Institutes of Health and Quest for CURES (QFC) grant from the Leukemia and Lymphoma Society (to K.M.).
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Ng, K.Y., Machida, K. (2017). Rosette Assay: Highly Customizable Dot-Blot for SH2 Domain Screening. In: Machida, K., Liu, B. (eds) SH2 Domains. Methods in Molecular Biology, vol 1555. Humana Press, New York, NY. https://doi.org/10.1007/978-1-4939-6762-9_26
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DOI: https://doi.org/10.1007/978-1-4939-6762-9_26
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