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. 1989 Dec 11;17(23):9693–9706. doi: 10.1093/nar/17.23.9693

The divergently transcribed genes encoding yeast ribosomal proteins L46 and S24 are activated by shared RPG-boxes.

L S Kraakman 1, W H Mager 1, K T Maurer 1, R T Nieuwint 1, R J Planta 1
PMCID: PMC335207  PMID: 2602141

Abstract

Transcription of the majority of the ribosomal protein (rp) genes in yeast is activated through common cis-acting elements, designated RPG-boxes. These elements have been shown to act as specific binding sites for the protein factor TUF/RAP1/GRF1 in vitro. Two such elements occur in the intergenic region separating the divergently transcribed genes encoding L46 and S24. To investigate whether the two RPG-boxes mediate transcription activation of both the L46 and S24 gene, two experimental strategies were followed: cloning of the respective genes on multicopy vectors and construction of fusion genes. Cloning of the L46 + S24 gene including the intergenic region in a multicopy yeast vector indicated that both genes are transcriptionally active. Using constructs in which only the S24 or the L46 gene is present, with or without the intergenic region, we obtained evidence that the intergenic region is indispensable for transcription activation of either gene. To demarcate the element(s) responsible for this activation, fusions of the intergenic region in either orientation to the galK reporter gene were made. Northern analysis of the levels of hybrid mRNA demonstrated that the intergenic region can serve as an heterologous promoter when it is in the 'S24-orientation'. Surprisingly, however, when fused in the reverse orientation the intergenic region did hardly confer transcription activity on the fusion gene. Furthermore, a 274 bp FnuDII-FnuDII fragment from the intergenic region that contains the RPG-boxes, could replace the naturally occurring upstream activation site (UASrpg) of the L25 rp-gene only when inserted in the 'S24-orientation'. Removal of 15 bp from the FnuDII fragment appeared to be sufficient to obtain transcription activation in the 'L46 orientation' as well. Analysis of a construct in which the RPG-boxes were selectively deleted from the promoter region of the L46 gene indicated that the RPG-boxes are needed for efficient transcriptional activation of the L46 gene. We conclude that all promoter elements for the S24 gene are located within the intergenic region, where the RPG-boxes are the most likely UAS-elements. However, the intergenic region (including the RPG-boxes) is required but not sufficient to confer transcription activity on the L46 gene.

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Selected References

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