Linked Life Data

1748992

Source:http://linkedlifedata.com/resource/pubmed/id/1748992

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pubmed-article:1748992pubmed:abstractTextTo identify the DNA sequences required for initiation of transcription in archaea, the 5'-flanking region of the tRNA(Val) gene of Methanococcus vannielii was modified by deletions, restructuring and site-directed mutagenesis, and the tRNA encoding sequence was replaced by a fortuitous Escherichia coli sequence. The effects of these mutations on promoter function were tested in an homologous cell-free transcription system. The DNA region from position -35 to +9 relative to the transcription start site was sufficient for maximal initiation of cell-free transcription. Removal of the DNA region between -35 and -30 reduced initiation by a factor of 2. Deletions extending to position -24 almost completely abolished specific transcription. Analysis of 16 site-specific mutations in the region from -33 to +2 provided evidence that a conserved A + T-rich sequence (TATA box), centered at -25, is essential for initiation of transcription. Single point mutations in six positions of the TATA box reduced initiation of transcription from 0.2 to 0.01 of wild-type levels. A second conserved motif at the transcription start site (consensus ATGC) could be replaced by some sequences containing a pyrimidine-purine dinucleotide but appeared necessary for a maximal rate of gene transcription. Mutations altering the spacing between the two conserved elements demonstrated that initiation occurs at a strictly defined distance of 22 to 27 base-pairs downstream from the TATA box. Our results support the conclusion that the TATA box is the major DNA region mediating promoter recognition, influencing the efficiency of transcription and specifying the site of transcription initiation. This Methanococcus promoter element closely resembles in structure and function the TATA box of promoters of eukaryotic protein-encoding genes transcribed by RNA polymerase II.lld:pubmed
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pubmed-article:1748992pubmed:articleTitleControl regions of an archaeal gene. A TATA box and an initiator element promote cell-free transcription of the tRNA(Val) gene of Methanococcus vannielii.lld:pubmed
pubmed-article:1748992pubmed:affiliationLehrstuhl für Mikrobiologie, Universität Regensburg, Germany.lld:pubmed
pubmed-article:1748992pubmed:publicationTypeJournal Articlelld:pubmed
pubmed-article:1748992pubmed:publicationTypeResearch Support, Non-U.S. Gov'tlld:pubmed
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