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. 1994 Jun;14(6):3719–3728. doi: 10.1128/mcb.14.6.3719

Equivalent mutations in the two repeats of yeast TATA-binding protein confer distinct TATA recognition specificities.

K M Arndt 1, C R Wobbe 1, S Ricupero-Hovasse 1, K Struhl 1, F Winston 1
PMCID: PMC358739  PMID: 8196615

Abstract

To investigate the process of TATA box recognition by the TATA box-binding protein (TBP), we have performed a detailed genetic and biochemical analysis of two Saccharomyces cerevisiae TBP mutants with altered DNA-binding specificity. The mutant proteins have amino acid substitutions (Leu-205 to Phe and Leu-114 to Phe) at equivalent positions within the two repeats of TBP that are involved in TATA element binding. In an in vivo assay that employs a nearly complete set of single point mutations of the consensus TATAAA sequence, one of the TBP mutants (TBP-L114F) recognizes the sequence TATAAG, while the other TBP mutant (TBP-L205F) recognizes one substitution at the first position of the TATA element, CATAAA, and three substitutions at the 3' end of the TATA box. Specificity patterns determined from in vitro transcription experiments with purified recombinant wild-type TBP and TBP-L205F agree closely with those observed in vivo, indicating that altered TATA utilization in the mutant strains is a direct consequence of altered TATA recognition by the mutant TBPs. The distinct TATA recognition patterns exhibited by TBP-L114F and TBP-L205F strongly suggest that in vivo, TBP binds to the TATA element in a specific orientation. The orientation predicted from these studies is further supported by the identification of intragenic suppressors that correct the defect of TBP-L205F. This orientation is consistent with that observed in vitro by crystallographic analyses of TBP-TATA box complexes. Finally, the importance of altered DNA-binding specificity in transcriptional regulation at the S. cerevisiae his4-912 delta promoter was addressed for TBP-L205F. A mutational analysis of this promoter region demonstrates that the nonconsensus TATA element CATAAA is required for a transcriptional effect of TBP-L205F in vivo. This finding suggests that the interaction of TBP with nonconsensus TATA elements may play an important regulatory role in transcription initiation.

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Selected References

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