A reporter gene system for the hyperthermophilic archaeon Sulfolobus solfataricus based on a selectable and integrative shuttle vector

Molecular Microbiology
Melanie JonuscheitC Schleper

Abstract

Sulfolobus solfataricus has developed into an important model organism for molecular and biochemical studies of hyperthermophilic archaea. Although a number of in vitro systems have been established for the organism, efficient tools for genetic manipulations have not yet been available for any hyperthermophile. In this work, we have developed a stable and selectable shuttle vector based on the virus SSV1 of Sulfolobus shibatae. We have introduced pUC18 for propagation in Escherichia coli and the genes pyrEF coding for orotidine-5'-monophosphate pyrophosphorylase and orotidine-5'-monophosphate decarboxylase of Sulfolobus solfataricus as selectable marker to complement pyrimidine auxotrophic mutants. Furthermore, the beta-galactosidase gene (lacS) was introduced into this vector as a reporter under the control of the strong and heat-inducible promoter of the Sulfolobus chaperonin (thermosome). After transformation of a S. solfataricus pyrEF/lacS double mutant, the vector was found to reside as a single-copy vector, stably integrated into the host chromosome via the site-specific recombination system of SSV1. Specific beta-galactosidase activities in transformants were found to be fourfold higher than in wild-type S. solfataricus ...Continue Reading

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