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The 3'-noncoding region of the priB gene derived from the basidiomycete Lentinus edodes was found to contain one GC box-like sequence, two CAAT boxes, two TATA box-like sequences and two pyrimidine-rich stretches (CT-motifs). It also contained a 16-bp sequence similar to the consensus sequence for PRIB protein binding and a short (61 bp) intron. Single-strand-specific S1 nuclease analysis of plasmid pBR322 DNA containing the 3'-noncoding region propagated in Escherichia coli revealed that this region forms an unusual, extended open structure within/around the downstream pyrimidine/purine (CT/AG)-biased sequence. To examine the promoter activity of the priB 3'-noncoding region in Saccharomyces cerevisiae, in which an autonomously replicating plasmid vector is available, we constructed two plasmids, YEp3'NCR-lacZ and YEp3'UTR-lacZ. The former contains the priB 3'-noncoding region and the reporter E. coli beta-galactosidase gene while the latter contains the priB 3'-noncoding region lacking the intron and the reporter gene. The yeast transformants obtained through introductions of these plasmids showed beta-galactosidase activity and the activity conferred by YEp3'NCR-lacZ was about 50% of that conferred by YEp3'UTR-lacZ. The primer extension analysis showed that transcription of the reporter gene on both plasmids starts at three alternative sites all of which are located within the downstream CT-motif, suggesting a role for the unusual structure of the CT/AG-biased sequence in the initiation of transcription.

A promoter activity in Saccharomyces cerevisiae of the 3'-noncoding region of the basidiomycetous mushroom gene.