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Protein Expr Purif. 2003 Oct;31(2):271-5.

Large scale production of biologically active Escherichia coli glutamyl-tRNA reductase from inclusion bodies.

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Institute of Microbiology, Technical University Braunschweig, Spielmannstrasse 7, D-38106 Braunschweig, Germany.


Glutamyl-tRNA reductase catalyzes the initial step of tetrapyrrole biosynthesis in plants and prokaryotes. Recombinant Escherichia coli glutamyl-tRNA reductase was purified to apparent homogeneity from an overproducing E. coli strain by a two-step procedure yielding 5.6 mg of enzyme per gram of wet cells with a specific activity of 0.47 micromol min(-1)mg(-1). After recombinant production, denatured glutamyl-tRNA reductase from inclusion bodies was renatured by an on-column refolding procedure. Residual protein aggregates were removed using Superdex 200 gel-filtration chromatography. Solubility, specific activity, and long-term storage properties were improved compared to previous protocols. Obtained enzyme amounts of high purity now allow the research on the recognition mechanism of tRNAGlu and high-throughput inhibitor screening.

[Indexed for MEDLINE]

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