Assembly of recombinant TFIID reveals differential coactivator requirements for distinct transcriptional activators.
Cell
; 79(1): 93-105, 1994 Oct 07.
Article
em En
| MEDLINE
| ID: mdl-7923382
ABSTRACT
We previously reported that transcriptional regulators can bind selected TAF subunits of the TFIID complex. However, the specificity and function of individual TAFs in mediating transcriptional activation remained unknown. Here we report the in vitro assembly and transcriptional properties of TBP-TAF complexes reconstituted from the nine recombinant subunits of Drosophila TFIID. A minimal complex containing TBP and TAFII250 directs basal but not activator-responsive transcription. By contrast, reconstituted holo-TFIID supports activation by an assortment of activators. The activator NTF-1, which binds TAFII150, stimulates transcription with a complex containing only TBP, TAFII250, and TAFII150, whereas Sp1 binds and additionally requires TAFII110 for activation. Interestingly, TAFII150 enhances Sp1 activation even though this subunit does not bind directly to Sp1. These results establish that specific subcomplexes of TFIID can mediate activation by different classes of activators and suggest that TAFs perform multiple functions during activation.
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Coleções:
01-internacional
Base de dados:
MEDLINE
Assunto principal:
Fatores de Transcrição
/
Proteínas Recombinantes
/
Proteínas de Drosophila
/
Fatores Associados à Proteína de Ligação a TATA
Tipo de estudo:
Prognostic_studies
Limite:
Animals
Idioma:
En
Revista:
Cell
Ano de publicação:
1994
Tipo de documento:
Article