title: Localization and characterization of protein-protein interaction sites.
abstract: This chapter aims to describe methods to identify and characterize protein-protein interactions that were developed during our studies on translation initiation factor complexes. Methods include the two-hybrid assay, the GST pull-down assay, and the coimmunoprecipitation (co-IP) assay. The two-hybrid assay provides for a convenient start to find the minimal interaction domains, which generally produce well-behaved recombinant proteins suited for various in vitro interaction assays. Emphasis is placed on demonstrating physiological relevance of identified interactions. The effective strategy is to find mutations that reduce the interaction by genetic or site-directed mutational approaches and obtain correlations between their effects in vitro (GST pull down) and effects in vivo (co-IP).
authors.affiliation: Molecular, Cellular, and Developmental Biology Program, Division of Biology, Kansas State University, Manhattan, Kansas, USA.
authors.forename: Chingakham Ranjit
authors.initials: CR
authors.lastname: Singh
authors.forename: Katsura
authors.initials: K
authors.lastname: Asano
mesh_terms: D002846:Chromatography, Affinity; D039642:Eukaryotic Initiation Factors / Q000502:physiology; D005982:Glutathione Transferase / Q000235:genetics; D047468:Immunoprecipitation; D016297:Mutagenesis, Site-Directed; D054730:Protein Interaction Domains and Motifs; D025941:Protein Interaction Mapping / Q000379:methods*; D011993:Recombinant Fusion Proteins; D012441:Saccharomyces cerevisiae / Q000235:genetics / Q000502:physiology; D020798:Two-Hybrid System Techniques
chemical_list: D039642:Eukaryotic Initiation Factors; D011993:Recombinant Fusion Proteins; D005982:Glutathione Transferase