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. 1995 Sep 12;92(19):8606–8610. doi: 10.1073/pnas.92.19.8606

RNA polymerase II/III transcription specificity determined by TATA box orientation.

Y Wang 1, W E Stumph 1
PMCID: PMC41015  PMID: 7567983

Abstract

The TATA box sequence in eukaryotes is located about 25 bp upstream of many genes transcribed by RNA polymerase II (Pol II) and some genes transcribed by RNA polymerase III (Pol III). The TATA box is recognized in a sequence-specific manner by the TATA box-binding protein (TBP), an essential factor involved in the initiation of transcription by all three eukaryotic RNA polymerases. We have investigated the recognition of the TATA box by the Pol II and Pol III basal transcription machinery and its role in establishing the RNA polymerase specificity of the promoter. Artificial templates were constructed that contained a canonical TATA box as the sole promoter element but differed in the orientation of the 8-bp TATA box sequence. As expected, Pol II initiated transcription in unfractionated nuclear extracts downstream of the "forward" TATA box. In distinct contrast, transcription that initiated downstream of the "reverse" TATA box was carried out specifically by Pol III. Importantly, this effect was observed regardless of the source of the DNA either upstream or downstream of the TATA sequence. These findings suggest that TBP may bind in opposite orientations on Pol II and Pol III promoters and that opposite, yet homologous, surfaces of TBP may be utilized by the Pol II and Pol III basal machinery for the initiation of transcription.

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