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• W1499587699 abstract "Cell‐free protein synthesis offers rapid access to proteins that are selectively labelled with [ 15 N]amino acids and suitable for analysis by NMR spectroscopy without chromatographic purification. A system based on an Escherichia coli cell extract was optimized with regard to protein yield and minimal usage of 15 N‐labelled amino acid, and examined for the presence of metabolic by‐products which could interfere with the NMR analysis. Yields of up to 1.8 mg of human cyclophilin A per mL of reaction medium were obtained by expression of a synthetic gene. Equivalent yields were obtained using transcription directed by either T7 or tandem phage λ p R and p L promoters, when the reactions were supplemented with purified phage T7 or E. coli RNA polymerase. Nineteen samples, each selectively labelled with a different 15 N‐enriched amino acid, were produced and analysed directly by NMR spectroscopy after ultracentrifugation. Cross‐peaks from metabolic by‐products were evident in the 15 N‐HSQC spectra of 13 of the samples. All metabolites were found to be small molecules that could be separated readily from the labelled proteins by dialysis. No significant transamination activity was observed except for [ 15 N]Asp, where an enzyme in the cell extract efficiently converted Asp→Asn. This activity was suppressed by replacing the normally high levels of potassium glutamate in the reaction mixture with ammonium or potassium acetate. In addition, the activity of peptide deformylase appeared to be generally reduced in the cell‐free expression system." @default.
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• W1499587699 date "2004-09-24" @default.
• W1499587699 modified "2023-10-18" @default.
• W1499587699 title "Optimization of an Escherichia coli system for cell-free synthesis of selectively 15N-labelled proteins for rapid analysis by NMR spectroscopy" @default.
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• W1499587699 doi "https://doi.org/10.1111/j.1432-1033.2004.04346.x" @default.
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