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Default Cell-free protein synthesis in an autoinduction system for NMR studies of protein-protein interactions.

Cell-free protein synthesis in an autoinduction system for NMR studies of protein-protein interactions.

Related Articles Cell-free protein synthesis in an autoinduction system for NMR studies of protein-protein interactions.

J Biomol NMR. 2005 Jul;32(3):235-41

Authors: Ozawa K, Jergic S, Crowther JA, Thompson PR, Wijffels G, Otting G, Dixon NA

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 chi, psi and gamma subunits of Escherichia coli DNA polymerase III: nascent, selectively 15N-labeled psi produced in the presence of chi resulted in a soluble, correctly folded chi-psi complex, whereas psi alone precipitated irrespective of whether gamma was present or not. The 15N-HSQC spectra showed that the N-terminal segment of psi is mobile in the chi-psi complex, yet important for its binding to gamma. 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.

PMID: 16132823 [PubMed - indexed for MEDLINE]



Source: PubMed
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