Nucleic Acids Research, 1995, Vol. 23, No. 10 1775-1781
© 1995
MOLECULAR BIOLOGY |
Cloning and functional analysis of the TATA binding protein from Sulfolobus shibatae
Wellcome/CRC Institute, Tennis Court Road, Cambridge CB2 1QR, UK and Department of Zoology, Cambridge University Cambridge, UK
*To whom correspondence should be addressed
Received January 19, 1995. Revised March 28, 1995. Accepted March 28, 1995.
Archaea (formerly archaebacterla) comprise a domain of life that is phylogenetically distinct from both Eucarya and Bacteria. Here we report the cloning of a gene from the Archaeon Suifolobus shlbatae that encodes a protein with strong homology to the TATA binding protein (TBP) of eukaryotes. Sulfolobus shibatae TBP is, however, almost as diverged from other archaeal TBPs that have been cloned as it is from eukaryotic TBPs. DNA binding studies indicate that S.shibatae TBP recognizes TATA-like A-box sequences that are present upstream of most archaeaI genes. By quantitatively Immunodepleting S.shibatae TBP from an In vitro transcription system, we demonstrate that Sulfolobus RNA polymerase is capable of transcribing the 16S/23S rRNA promoter weakly in the absence of TBR Most significantly, we show that addition of recombinant S.shibatae TBP to this immunodepleted system leads to transcriptional stimulation and that this stimulation is dependent on the A-box sequence of the promoter. Taken together, these findings reveal fundamental similarities between the transcription machineries of Archaea and eukaryotes.
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