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Genetics, Vol. 155, 1045-1054, July 2000, Copyright © 2000

Functional Interaction of CCR4-NOT Proteins With TATAA-Binding Protein (TBP) and Its Associated Factors in Yeast

Vasudeo Badarinarayanaa, Yueh-Chin Chianga, and Clyde L. Denisa
a Department of Biochemistry and Molecular Biology, University of New Hampshire, Durham, New Hampshire 03824

Corresponding author: Clyde L. Denis, Department of Biochemistry and Molecular Biology, Rudman Hall, University of New Hampshire, Durham, NH 03824., cldenis{at}christa.unh.edu (E-mail)

Communicating editor: M. HAMPSEY

The CCR4-NOT transcriptional regulatory complex affects expression of a number of genes both positively and negatively. We report here that components of the CCR4-NOT complex functionally and physically interact with TBP and TBP-associated factors. First, mutations in CCR4-NOT components suppressed the his4-912{delta} insertion in a manner similar to that observed for the defective TBP allele spt15-122. Second, using modified HIS3 promoter derivatives containing specific mutations within the TATA sequence, we found that the NOT proteins were general repressors that disrupt TBP function irrespective of the DNA sequence. Third, increasing the dosage of NOT1 specifically inhibited the ability of spt15-122 to suppress the his4-912{delta} insertion but did not affect the Spt- phenotype of spt3 or spt10 at this locus. Fourth, spt3, spt8, and spt15-21 alleles (all involved in affecting interaction of SPT3 with TBP) suppressed ccr4 and caf1 defects. Finally, we show that NOT2 and NOT5 can be immunoprecipitated by TBP. NOT5 was subsequently shown to associate with TBP and TAFs and this association was dependent on the integrity of TFIID. These genetic and physical interactions indicate that one role of the CCR4-NOT proteins is to inhibit functional TBP-DNA interactions, perhaps by interacting with and modulating the function of TFIID.




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