DOI: 10.1101/gad.8.19.2313. Drosophila TFIIA directs cooperative DNA binding with TBP and mediates transcriptional activation.

Drosophila TFIIA directs cooperative DNA binding with TBP and mediates transcriptional activation.

10.1101/gad.8.19.2313

Crossref journal-article

Cold Spring Harbor Laboratory

Genes & Development (246)

Abstract

Drosophila transcription factor IIA (TFIIA) is composed of three subunits (30, 20, and 14 kD) that function during initiation of transcription. We reported previously the characterization of cDNAs that encode a precursor (dTFIIA-L) of the Drosophila TFIIA 30- and 20-kD subunits. In the absence of the smallest subunit, dTFIIA-S (14 kD), the unprocessed large subunit failed to exhibit any detectable promoter binding or transcriptional activity. Here, we report the molecular cloning and expression of dTFIIA-S, which has allowed the assembly of holo-dTFIIA (dTFIIA-L/S). Subunit interaction studies indicate that dTFIIA-S binds to an amino-terminal domain of dTFIIA-L, which likely corresponds to the endogenous 30-kD processed species. In addition, both dTFIIA-S and the carboxy-terminal domain of dTFIIA-L, which corresponds to the 20-kD species, independently interact weakly with the TATA-binding protein (TBP). In contrast, the holo-dTFIIA (L/S) binds TBP with high affinity. The dTFIIA-L/S complex also binds cooperatively with TBP to TATA box DNA sequences, generating an extended DNase footprint pattern. The reconstituted holo-dTFIIA is able to stimulate basal transcription of several core promoter templates. Interestingly, dTFIIA-L/S is also able to significantly enhance transcriptional activation by upstream transcription factors including Sp1, VP16, and NTF-1. These results suggest that dTFIIA is a multifunctional transcription factor capable of influencing DNA binding as well as interactions with the basal machinery, thereby enhancing activator-dependent transcription.

Bibliography

Yokomori, K., Zeidler, M. P., Chen, J. L., Verrijzer, C. P., Mlodzik, M., & Tjian, R. (1994). Drosophila TFIIA directs cooperative DNA binding with TBP and mediates transcriptional activation. Genes & Development, 8(19), 2313â2323.

Authors 6

K Yokomori (first)
M P Zeidler (additional)
J L Chen (additional)
C P Verrijzer (additional)
M Mlodzik (additional)
R Tjian (additional)

References 30 Referenced 87

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Dates

Type	When
Created	18 years, 2 months ago (June 5, 2007, 5:15 p.m.)
Deposited	3 years, 9 months ago (Nov. 14, 2021, 9:25 p.m.)
Indexed	3 weeks, 2 days ago (Aug. 5, 2025, 8:53 a.m.)
Issued	30 years, 10 months ago (Oct. 1, 1994)
Published	30 years, 10 months ago (Oct. 1, 1994)
Published Online	30 years, 10 months ago (Oct. 1, 1994)
Published Print	30 years, 10 months ago (Oct. 1, 1994)

Funders 0

None

BibTeX

@article{Yokomori_1994, title={Drosophila TFIIA directs cooperative DNA binding with TBP and mediates transcriptional activation.}, volume={8}, ISSN={1549-5477}, url={http://dx.doi.org/10.1101/gad.8.19.2313}, DOI={10.1101/gad.8.19.2313}, number={19}, journal={Genes & Development}, publisher={Cold Spring Harbor Laboratory}, author={Yokomori, K and Zeidler, M P and Chen, J L and Verrijzer, C P and Mlodzik, M and Tjian, R}, year={1994}, month=oct, pages={2313–2323} }

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