Abstract:
:A system where archaeal gene expression could be controlled by simple manipulation of growth conditions would enable the construction of conditional lethal mutants in essential genes, and permit the controlled overproduction of proteins in their native host. As tools for the genetic manipulation of Haloferax volcanii are well developed, we set out to identify promoters with a wide dynamic range of expression in this organism. Tryptophan is the most costly amino acid for the cell to make, so we reasoned that tryptophan-regulated promoters might be good candidates. Microarray analysis of H. volcanii gene expression in the presence and absence of tryptophan identified a tryptophanase gene (tna) that showed strong induction in the presence of tryptophan. qRT-PCR revealed a very fast response and an up to 100-fold induction after tryptophan addition. This result has been confirmed using three independent reporter genes (cct1, pyrE2 and bgaH). Vectors containing this promoter will be very useful for investigating gene function in H. volcanii and potentially in other halophilic archaea. To demonstrate this, we used the promoter to follow the consequences of depletion of the essential chaperonin protein CCT1, and to determine the ability of heterologous CCT proteins to function in H. volcanii.
journal_name
Mol Microbioljournal_title
Molecular microbiologyauthors
Large A,Stamme C,Lange C,Duan Z,Allers T,Soppa J,Lund PAdoi
10.1111/j.1365-2958.2007.05980.xsubject
Has Abstractpub_date
2007-12-01 00:00:00pages
1092-106issue
5eissn
0950-382Xissn
1365-2958pii
MMI5980journal_volume
66pub_type
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