共 59 条
Expression and heat-responsive regulation of a TFIIB homologue from the archaeon Haloferax volcanii
被引:41
作者:

Thompson, DK
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Ohio State Univ, Dept Microbiol, Columbus, OH 43210 USA Ohio State Univ, Dept Microbiol, Columbus, OH 43210 USA

Palmer, JR
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Ohio State Univ, Dept Microbiol, Columbus, OH 43210 USA Ohio State Univ, Dept Microbiol, Columbus, OH 43210 USA

Daniels, CJ
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机构:
Ohio State Univ, Dept Microbiol, Columbus, OH 43210 USA Ohio State Univ, Dept Microbiol, Columbus, OH 43210 USA
机构:
[1] Ohio State Univ, Dept Microbiol, Columbus, OH 43210 USA
关键词:
D O I:
10.1046/j.1365-2958.1999.01551.x
中图分类号:
Q5 [生物化学];
Q7 [分子生物学];
学科分类号:
071010 ;
081704 ;
摘要:
Multiple divergent genes encoding the eukaryal-like TFIIB (TFB) transcription initiation factor have been identified in the archaeon Haloferax volcanii. Expression of one of these TFB-encoding genes, referred to here as tfb2, was induced specifically in response to heat shock at the transcription level. A time course for tfb2 induction demonstrated that mRNA levels increased as much as eightfold after 15 min at 60 degrees C. A transcription fusion of the tfb2 promoter region with a stable RNA reporter gene confirmed the heat responsiveness of the tfb2 core promoter, and immunoblot analysis using antibodies generated against a recombinant His-tagged TFB2 showed that the protein levels of one TFB increased slightly in response to elevated temperatures. An archaeal consensus TATA element (5'-TTTATA-3') was located 110 bp upstream of the translation start site and appeared to be used for both basal and heat shock-induced expression. The long DNA leader region (79 bp) preceding the predicted AUG translation start codon for TFB2 contained a T-rich sequence element located 22 bp downstream of the transcription start site. Using an in vivo transcription termination assay, we demonstrated that this T-rich element can function as a sequence-dependent transcription terminator, which may serve to downregulate expression of the tfb2 gene under both non-heat shock and heat shock conditions.
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页码:1081 / 1092
页数:12
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