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Using Coculture to Detect Chemically Mediated Interspecies Interactions

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Development of a versatile shuttle vector for gene expression in Geobacillus spp.

Mark P Taylor¹, Carlos D Esteban, David J Leak

¹Division of Biology, Department of Life Sciences, Imperial College London, Exhibition Road, South Kensington, London SW7 2AZ, UK.

|May 27, 2008

Summary

A new shuttle vector, pUCG18, enables efficient metabolic engineering in Geobacillus species. This versatile tool facilitates gene expression at high temperatures, advancing thermophilic microbial applications.

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Area of Science:

Microbiology
Molecular Biology
Biotechnology

Background:

Metabolic engineering of thermophilic bacteria like Geobacillus spp. requires robust genetic tools.
Existing vectors may lack stability or efficiency at high temperatures.
Kanamycin is a preferred antibiotic for thermophilic applications due to its thermostability.

Purpose of the Study:

To develop an improved and versatile shuttle vector for the metabolic engineering of Geobacillus species.
To create a vector that is stable and functional at elevated temperatures.
To demonstrate the utility of the vector for heterologous gene expression in Geobacillus.

Main Methods:

Cloning a thermostable kanamycin nucleotidyltransferase gene and the origin of replication from Geobacillus stearothermophilus plasmid pBST1 into Escherichia coli vector pUC18.
Creating the pUCG18 shuttle vector.
Transforming G. thermoglucosidasius with pUCG18 and assessing its stability and transformation efficiency.
Demonstrating heterologous expression of the pyruvate decarboxylase (pdc) gene from Zymomonas palmae.

Main Results:

The pUCG18 shuttle vector was successfully constructed and replicated in both E. coli and G. thermoglucosidasius.
High transformation efficiency (1 x 10^4 transformants/µg DNA) was achieved in G. thermoglucosidasius.
The vector demonstrated stability at temperatures up to 68°C with kanamycin selection.
Successful expression of the Zymomonas palmae pdc gene in G. thermoglucosidasius at 45°C was confirmed.
Sequence analysis revealed the pBST1 origin of replication shares homology with theta replicons found in Bacillus megaterium.

Conclusions:

The pUCG18 shuttle vector is a versatile and effective tool for metabolic engineering in Geobacillus species.
This vector enables stable gene expression and manipulation of thermophilic bacteria at high temperatures.
The findings expand the genetic toolbox for thermophilic microorganisms and suggest potential for broader applications.