Abstract
Cell-free protein synthesis systems provide facile access to proteins in a nascent state that enables formation of soluble, native protein–protein complexes even if one of the protein components is prone to self-aggregation and precipitation. Combined with selective isotope-labeling, this allows the rapid analysis of protein–protein interactions with few 15N-HSQC spectra. The concept is demonstrated with binary and ternary complexes between the χ, ψ and γ subunits of Escherichia coli DNA polymerase III: nascent, selectively 15N-labeled ψ produced in the presence of χ resulted in a soluble, correctly folded χ-ψ complex, whereas ψ alone precipitated irrespective of whether γ was present or not. The 15N-HSQC spectra showed that the N-terminal segment of ψ is mobile in the χ-ψ complex, yet important for its binding to γ. The sample preparation was greatly enhanced by an autoinduction strategy, where the T7 RNA polymerase needed for transcription of a gene in a T7-promoter vector was produced in situ.
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Ozawa, K., Jergic, S., Crowther, J.A. et al. Cell-free Protein Synthesis in an Autoinduction System for NMR Studies of Protein–Protein Interactions. J Biomol NMR 32, 235–241 (2005). https://doi.org/10.1007/s10858-005-7946-4
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DOI: https://doi.org/10.1007/s10858-005-7946-4