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Applied and Environmental Microbiology, March 2001, p. 1262-1267, Vol. 67, No. 3
0099-2240/01/$04.00+0   DOI: 10.1128/AEM.67.3.1262-1267.2001
Copyright © 2001, American Society for Microbiology. All rights reserved.

pAM401-Based Shuttle Vectors That Enable Overexpression of Promoterless Genes and One-Step Purification of Tag Fusion Proteins Directly from Enterococcus faecalis

Shuhei Fujimoto1,* and Yasuyoshi Ike1,2

Department of Microbiology1 and Laboratory of Bacterial Drug Resistance,2 Gunma University, School of Medicine, Maebashi, Gunma, Japan

Received 2 October 2000/Accepted 1 January 2001

Two novel Enterococcus faecalis-Escherichia coli shuttle vectors that utilize the promoter and ribosome binding site of bacA on the E. faecalis plasmid pPD1 were constructed. The vectors were named pMGS100 and pMGS101. pMGS100 was designed to overexpress cloned genes in E. coli and E. faecalis and encodes the bacA promoter followed by a cloning site and stop codon. pMGS101 was designed for the overexpression and purification of a cloned protein fused to a Strep-tag consisting of 9 amino acids at the carboxyl terminus. The Strep-tag provides the cloned protein with an affinity to immobilized streptavidin that facilitates protein purification. We cloned a promoterless beta -galactosidase gene from E. coli and cloned the traA gene of the E. faecalis plasmid pAD1 into the vectors to test gene expression and protein purification, respectively. beta -Galactosidase was expressed in E. coli and E. faecalis at levels of 103 and 10 Miller units, respectively. By cloning the pAD1 traA into pMGS101, the protein could be purified directly from a crude lysate of E. faecalis or E. coli with an immobilized streptavidin matrix by one-step affinity chromatography. The ability of TraA to bind DNA was demonstrated by the DNA-associated protein tag affinity chromatography method using lysates prepared from both E. coli and E. faecalis that overexpress TraA. The results demonstrated the usefulness of the vectors for the overexpression and cis/trans analysis of regulatory genes, purification and copurification of proteins from E. faecalis, DNA binding analysis, determination of translation initiation site, and other applications that require proteins purified from E. faecalis.

* Corresponding author. Mailing address: Department of Microbiology, School of Medicine, Gunma University, 3-39-22 Showa, Maebashi, Gunma, Japan 371-8511. Phone: 81 27 220 7992. Fax: 81 27 220 7996. E-mail: sfujimot{at}med.gunma-u.ac.jp.

Applied and Environmental Microbiology, March 2001, p. 1262-1267, Vol. 67, No. 3
0099-2240/01/$04.00+0   DOI: 10.1128/AEM.67.3.1262-1267.2001
Copyright © 2001, American Society for Microbiology. All rights reserved.


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