Abstract
To express foreign proteins in Actinobacillus succinogenes, a shuttle vector was constructed based on the Actinobacillus pleuropneumoniae-Escherichia coli shuttle vector, pGZRS-19. We demonstrated that A. succinogenes is transformed by electroporation at reasonably high efficiency, that pGZRS-19 is stable in A. succinogenes, and that the ampicillin resistance gene carried by pGZRS-19 is expressed in A. succinogenes. Three steps were then required to develop our A. succinogenes-E. coli shuttle vector. (i) The constitutively expressed A. succinogenes phosphoenolpyruvate carboxykinase gene, pckA, was cloned and sequenced. (ii) Its promoter region and ribosome-binding site were subcloned into pGZRS-19. (iii) Finally, the ColE1 origin of replication was added to the vector to increase its stability in E. coli. High levels of A. succinogenes phosphoenolpyruvate carboxykinase, E. coli NADP-dependent malic enzyme, and Bacillus subtilis NAD-dependent malic enzyme activities detected in recombinant A. succinogenes strains confirmed that A. succinogenes and foreign proteins could be expressed in A. succinogenes under control of the A. succinogenes pckA promoter carried by pLGZ920. A. succinogenes is sensitive to chloramphenicol and tetracycline. Although not expressed from their own promoters, the Tn9 chloramphenicol and the Tn10 tetracycline resistance genes are expressed under control of the pckA promoter, and they can be used as additional selection markers in A. succinogenes.
| Original language | English |
|---|---|
| Pages (from-to) | 108-115 |
| Number of pages | 8 |
| Journal | Plasmid |
| Volume | 51 |
| Issue number | 2 |
| DOIs | |
| State | Published - Mar 2004 |
Bibliographical note
Funding Information:This research was supported by a grant from NSF (# BES-0224596), and by a Michigan State University REF grant. P. Kim was partly supported by the Korea Science and Engineering Foundation (2001 postdoc fellowship 2nd half). We thank Felicia Codrea for constructing plasmid pLGZ-920. We express our sincere gratitude to Drs. Suzan West (University of Wisconsin, Madison, WI) and Stefan Schwarz (Institut für Tierzucht und Tierverhalten der Bundesforschungsantalt für Landwirtschaft, Celle, Germany) for providing us with plasmids pGZRS-19, pGZRS-30 (Dr. West), and UB214 (Dr. Schwarz).
Keywords
- Actinobacillus succinogenes
- Expression
- Promoter
- Shuttle vector
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