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J. Bacteriol., 04 1995, 1844-1849, Vol 177, No. 7
JR Palmer and CJ Daniels
We have used a plasmid-based transcriptional reporter system to examine the
transcriptional effects of 33 single point mutations in the box A region
(TATA-like sequence) of the Haloferax volcanii tRNA(Lys) promoter. The most
pronounced effects on transcriptional efficiency were found when the
nucleotides corresponding to the TATA-like region were altered. Promoters
with wild-type or higher levels of transcriptional activity conformed to
the general archaeal box A consensus, 5'-T/CTTAT/AA-3'. The preference for
a pyrimidine residue in the 5' position of this region and the exclusion of
guanine and cytosine in the next four positions in the 3' direction are
defining characteristics shared by all efficient archaeal promoters. We
have also observed that replacement of a 10-nucleotide purine-rich
sequence, located 5' of the H. volcanii tRNA(Lys) box A element, completely
abolished transcription from this promoter. These data show that the H.
volcanii tRNA(Lys) promoter is dependent on two separate, and essential,
sequence elements. The possible functions of these sequences, in view of
the recent descriptions of eucaryal-like transcription factors for Archaea,
are discussed.
Copyright © 1995, American Society for Microbiology
In vivo definition of an archaeal promoter
Department of Microbiology, Ohio State University, Columbus 43210.
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