ABSTRACT
Robust genetic systems for the hyperthermophilic
Thermococcales
have facilitated the overexpression of native genes, enabled the addition of sequences encoding secretion signals, epitope, and affinity tags to coding regions, and aided the introduction of sequences encoding new proteins in these fast-growing fermentative heterotrophs. However, tightly controlled and easily manipulated systems facilitating regulated gene expression are limited for these hosts. Here, we describe an alternative method for regulatory control reliant on a
cis
-encoded functional riboswitch in the model archaeon
Thermococcus kodakarensis
. Despite the hyperthermophilic growth temperatures, the proposed structure of the riboswitch conforms to a fluoride-responsive riboswitch encoded in many bacteria and similarly functions to regulate a component-conserved fluoride export pathway. Deleting components of the fluoride export pathway generates
T. kodakarensis
strains with increased fluoride sensitivity. The mechanism underlying regulated expression suggested that the riboswitch-encoding sequences could be utilized as a tunable expression cassette. When appended to a reporter gene, the riboswitch-mediated control system provides fluoride-dependent tunable regulatory potential, offering an alternative system for regulating gene expression. Riboswitch-regulated expression is thus ubiquitous in extant life and can be exploited to generate regulated expression systems for hyperthermophiles.
IMPORTANCE
Gene expression is controlled by a myriad of interconnected mechanisms that interpret metabolic states and environmental cues to balance cell physiology. Transcription regulation in
Archaea
is known to employ both typical repressors-operators and transcription activators to regulate transcription initiation in addition to the regulation afforded by chromatin structure. It was perhaps surprising that the presumed ancient mechanism of riboswitch-mediated regulation is found in
Bacteria
and
Eukarya
, but seemingly absent in
Archaea
. We demonstrate here that a fluoride-responsive riboswitch functions to regulate a detoxification pathway in the hyperthermophilic archaeon
Thermococcus kodakarensis
. The results obtained define a universal role for riboswitch-mediated regulation, adumbrate the presence of several riboswitch-regulated genes in
Thermococcus kodakarensis
, demonstrate the utility of RNA-based regulation at high temperatures, and provide a novel riboswitch-regulated expression system to employ in hyperthermophiles.
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