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Molecular and Cellular Biology, July 1999, p. 5050-5060, Vol. 19, No. 7
0270-7306/99/$04.00+0
Copyright © 1999, American Society for Microbiology. All rights reserved.

Synergistic Transcriptional Activation by TATA-Binding Protein and hTAFII28 Requires Specific Amino Acids of the hTAFII28 Histone Fold

Anne-Claire Lavigne, Yann-Gaël Gangloff, Lucie Carré, Gabrielle Mengus,dagger Catherine Birck,Dagger Olivier Poch, Christophe Romier, Dino Moras, and Irwin Davidson*

Institut de Génétique et de Biologie Moléculaire et Cellulaire, CNRS/INSERM/ULP, 67404 Illkirch Cédex, C.U. de Strasbourg, France

Received 1 February 1999/Returned for modification 1 March 1999/Accepted 12 April 1999

Coexpression of the human TATA-binding protein (TBP)-associated factor 28 (hTAFII28) with the altered-specificity mutant TBP spm3 synergistically enhances transcriptional activation by the activation function 2 of the nuclear receptors (NRs) for estrogen and vitamin D3 from a reporter plasmid containing a TGTA element in mammalian cells. This synergy is abolished by mutation of specific amino acids in the alpha 2-helix of the histone fold in the conserved C-terminal region of hTAFII28. Critical amino acids are found on both the exposed hydrophilic face of this helix and the hydrophobic interface with TAFII18. This alpha -helix of hTAFII28 therefore mediates multiple interactions required for coactivator activity. We further show that mutation of specific residues in the H1' alpha -helix of TBP either reduces or increases interactions with hTAFII28. The mutations which reduce interactions with hTAFII28 do not affect functional synergy, whereas the TBP mutation which increases interaction with hTAFII28 is defective in its ability to synergistically enhance activation by NRs. However, this TBP mutant supports activation by other activators and is thus specifically defective for its ability to synergize with hTAFII28.

* Corresponding author. Mailing address: Institut de Génétique et de Biologie Moléculaire et Cellulaire, CNRS/INSERM/ULP, B.P. 163, 67404 Illkirch Cédex, C.U. de Strasbourg, France. Phone: 33 3 88 65 34 40 (45). Fax: 33 3 88 65 32 01. E-mail: irwin{at}titus.u-strasbg.fr.

dagger Present address: European Molecular Biology Laboratory, 69012 Heidelberg, Germany.

Dagger Present address: Institut de Pharmacologie et de Biologie Structurale, CNRS, UPR 9062, 31077 Toulouse, France.

Molecular and Cellular Biology, July 1999, p. 5050-5060, Vol. 19, No. 7
0270-7306/99/$04.00+0
Copyright © 1999, American Society for Microbiology. All rights reserved.


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