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J Biochem. 2010 Mar;147(3):361-70. doi: 10.1093/jb/mvp177. Epub 2009 Nov 3.

Identification of the Phr-dependent heat shock regulon in the hyperthermophilic archaeon, Thermococcus kodakaraensis.

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Department of Synthetic Chemistry and Biological Chemistry, Graduate School of Engineering, Kyoto University, Katsura, Nishikyo-ku, Kyoto, Japan.


The hyperthermophilic archaeon Thermococcus kodakaraensis harbors a putative transcriptional regulator (Tk-Phr) that is orthologous to the Pyrococcus furiosus Phr (Pf-Phr). Pf-Phr, a transcriptional regulator, represses genes encoding the small heat shock protein (sHSP), AAA(+) ATPase and Pf-Phr itself under normal growth temperatures. Here we constructed a gene disruption strain of Tk-Phr (strain KHR1). KHR1 cells showed similar specific growth rates with those of the wild-type strain under various temperatures. A whole genome microarray analysis was performed between KHR1 and wild-type cells grown at 80 degrees C. Transcript levels of more than 20 genes were significantly higher in KHR1 cells. Most genes contained a sequence motif virtually identical to that of Pf-Phr in their 5'-flanking regions. The Tk-Phr regulon included genes encoding sHSP, AAA(+) ATPase, prefoldin, RecA superfamily ATPase and Tip49. On the other hand, more than half of the members in the regulon encoded conserved/hypothetical proteins, raising the possibility that these proteins participate in unidentified processes of the heat shock response. In contrast, Tk-Phr deletion did not lead to dramatic increase in transcript and protein levels of a chaperonin (CpkB) previously shown to respond to heat shock, suggesting the presence of a second, Phr-independent heat shock response mechanism in T. kodakaraensis.

[Indexed for MEDLINE]

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