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. 1986 Oct;52(4):737–743. doi: 10.1128/aem.52.4.737-743.1986

Overproduction from a cellulase gene with a high guanosine-plus-cytosine content in Escherichia coli.

G P O'Neill, D G Kilburn, R A Warren, R C Miller Jr
PMCID: PMC239107  PMID: 3096205

Abstract

A recombinant exoglucanase was expressed in Escherichia coli to a level that exceeded 20% of total cellular protein. To obtain this level of overproduction, the exoglucanase gene coding sequence was fused to a synthetic ribosome-binding site, an initiating ATG, and placed under the control of the leftward promoter of bacteriophage lambda contained on the runaway replication plasmid vector pCP3 (E. Remaut, H. Tsao, and W. Fiers, Gene 22:103-113, 1983). With the exception of an inserted asparagine adjacent to the initiating ATG, the highly expressed exoglucanase is identical to the native exoglucanase. The overproduced exoglucanase can be isolated easily in an enriched form as insoluble aggregates, and exoglucanase activity can be recovered by solubilization of the aggregates in 6 M urea or 5 M guanidine hydrochloride. Since the codon usage of the exoglucanase gene is so markedly different from that of E. coli genes, the overproduction of the exoglucanase in E. coli indicates that codon usage may not be a major barrier to heterospecific gene expression in this organism.

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Selected References

These references are in PubMed. This may not be the complete list of references from this article.

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