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Applied and Environmental Microbiology, August 2000, p. 3166-3173, Vol. 66, No. 8
0099-2240/00/$04.00+0
Copyright © 2000, American Society for Microbiology. All rights reserved.

Simple and Efficient Method for Heterologous Expression of Clostridial Proteins

Alexey G. Zdanovsky* and Marina V. Zdanovskaia

Promega Corporation, Madison, Wisconsin 53711-5399

Received 11 April 2000/Accepted 15 May 2000

Many clostridial proteins are poorly produced in Escherichia coli. It has been suggested that this phenomena is due to the fact that several types of codons common in clostridial coding sequences are rarely used in E. coli and the quantities of the corresponding tRNAs in E. coli are not sufficient to ensure efficient translation of the corresponding clostridial sequences. To address this issue, we amplified three E. coli genes, ileX, argU, and leuW, in E. coli; these genes encode tRNAs that are rarely used in E. coli (the tRNAs for the ATA, AGA, and CTA codons, respectively). Our data demonstrate that amplification of ileX dramatically increased the level of production of most of the clostridial proteins tested, while amplification of argU had a moderate effect and amplification of leuW had no effect. Thus, amplification of certain tRNA genes for rare codons in E. coli improves the expression of clostridial genes in E. coli, while amplification of other tRNAs for rare codons might not be needed for improved expression. We also show that amplification of a particular tRNA gene might have different effects on the level of protein production depending on the prevalence and relative positions of the corresponding codons in the coding sequence. Finally, we describe a novel approach for improving expression of recombinant clostridial proteins that are usually expressed at a very low level in E. coli.

* Corresponding author. Mailing address: Promega Corporation, 2800 Woods Hollow Road, Madison, WI 53711-5399. Phone: (608) 298-4658. Fax: (608) 274-4330. E-mail: azdanovs{at}promega.com.

Applied and Environmental Microbiology, August 2000, p. 3166-3173, Vol. 66, No. 8
0099-2240/00/$04.00+0
Copyright © 2000, American Society for Microbiology. All rights reserved.


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